选课批次：时间窗口、退课截止、学分上限、开放/关闭。

教学班投放：容量、班级范围、全校开放。
学生选退课：容量、重复课程、学分上限、课表冲突校验。
教学班实时名单。
校级、学院级、学生角色分级操作。
SQLite 本地增量升级及演示数据。
MySQL 正式 EF Core 迁移。
Vue 已编译进 wwwroot，单服务运行无需 npm run dev。
学生端和管理端均完成桌面、手机响应式检查。

README.md

@@ -2,7 +2,7 @@
 
 面向普通高校的教务管理系统。后端使用 ASP.NET Core 10、EF Core 10，前端使用 Vue 3、TypeScript 和 Element Plus。
 
-当前已实现系统登录与角色权限、基础数据、用户管理、教师档案、学生档案、课程库、培养方案、教学任务、排课课表和首页统计。人员及课程列表支持组合筛选、服务端分页和完整增删改查；培养方案支持课程模块、专业年级版本、复制新版本、发布锁定和旧版本归档；教学任务支持学期课程开设、多教师、合班、容量校验、发布与结课；排课支持单双周、周次节次、教室容量、教师/行政班/教室冲突校验和版本化发布。
+当前已实现系统登录与角色权限、基础数据、用户管理、教师档案、学生档案、课程库、培养方案、教学任务、排课课表、学生选课和首页统计。人员及课程列表支持组合筛选、服务端分页和完整增删改查；培养方案支持课程模块、专业年级版本、复制新版本、发布锁定和旧版本归档；教学任务支持学期课程开设、多教师、合班、容量校验、发布与结课；排课支持单双周、周次节次、教室容量、教师/行政班/教室冲突校验和版本化发布；选课支持批次时间窗、投放范围、容量与学分上限、重复课程与课表冲突校验、退课截止时间和实时教学班名单。
 
 权限采用后端强制校验的角色与数据范围模型。多角色账号按 `All > College > Class > Self` 取最高数据范围：校级角色可访问全校数据，院系管理员限定本学院，辅导员通过稳定的账号 ID 绑定所带行政班，教师和学生限定本人及当前教学关系；前端菜单和路由限制仅作为交互辅助，不替代 API 授权。
 

scripts/smoke-test.ps1

@@ -91,6 +91,24 @@ try {
             -Uri "http://localhost:5255/api/schedules/plans/$($schedulePlans[0].id)" `
             -Headers $headers
     }
+    $selectionRounds = Invoke-RestMethod `
+        -Uri 'http://localhost:5255/api/course-selections/rounds' `
+        -Headers $headers
+    if (@($selectionRounds).Count -lt 1) {
+        throw 'Development course-selection round was not seeded.'
+    }
+    $activeSelectionRound = @($selectionRounds) |
+        Where-Object { $_.isAvailableNow } |
+        Select-Object -First 1
+    if ($null -eq $activeSelectionRound) {
+        throw 'No course-selection round is open for the smoke test.'
+    }
+    $selectionOfferings = Invoke-RestMethod `
+        -Uri "http://localhost:5255/api/course-selections/rounds/$($activeSelectionRound.id)/offerings" `
+        -Headers $headers
+    if (@($selectionOfferings).Count -lt 1) {
+        throw 'Development course-selection offering was not seeded.'
+    }
     $managedUsers = Invoke-RestMethod -Uri 'http://localhost:5255/api/users' -Headers $headers
     $teacherAccount = @($managedUsers) |
         Where-Object { $_.userName -eq 'teacher' } |
@@ -162,6 +180,48 @@ try {
         "$($scenario.UserName):$($scenario.Scope)"
     }
 
+    $studentLoginBody = @{
+        userName = 'student'
+        password = 'Student@123456'
+    } | ConvertTo-Json
+    $studentLogin = Invoke-RestMethod `
+        -Method Post `
+        -Uri 'http://localhost:5255/api/auth/login' `
+        -ContentType 'application/json' `
+        -Body $studentLoginBody
+    $studentHeaders = @{ Authorization = "Bearer $($studentLogin.token)" }
+    $studentOptions = Invoke-RestMethod `
+        -Uri "http://localhost:5255/api/course-selections/student/options?roundId=$($activeSelectionRound.id)" `
+        -Headers $studentHeaders
+    $studentOffering = @($studentOptions.offerings) | Select-Object -First 1
+    if ($null -eq $studentOffering) {
+        throw 'Student has no eligible course-selection offering.'
+    }
+    if ($studentOffering.enrollmentStatus -ne 'Enrolled') {
+        $enrollmentBody = @{ offeringId = $studentOffering.id } | ConvertTo-Json
+        Invoke-RestMethod `
+            -Method Post `
+            -Uri 'http://localhost:5255/api/course-selections/student/enrollments' `
+            -Headers $studentHeaders `
+            -ContentType 'application/json' `
+            -Body $enrollmentBody |
+            Out-Null
+    }
+    $studentEnrollments = Invoke-RestMethod `
+        -Uri "http://localhost:5255/api/course-selections/student/enrollments?academicTermId=$($activeSelectionRound.academicTermId)" `
+        -Headers $studentHeaders
+    $activeEnrollments = @($studentEnrollments) |
+        Where-Object { $_.status -eq 'Enrolled' }
+    if ($activeEnrollments.Count -lt 1) {
+        throw 'Student course enrollment was not persisted.'
+    }
+    $selectionRoster = Invoke-RestMethod `
+        -Uri "http://localhost:5255/api/course-selections/offerings/$($studentOffering.id)/roster" `
+        -Headers $headers
+    if ($selectionRoster.enrolledCount -lt 1) {
+        throw 'Course-selection roster did not include the selected student.'
+    }
+
     $frontend = Invoke-WebRequest -Uri 'http://localhost:5255/' -TimeoutSec 5
     $spaFallback = Invoke-WebRequest -Uri 'http://localhost:5255/base-data' -TimeoutSec 5
     $unknownApiParameters = @{
@@ -186,6 +246,10 @@ try {
         TeachingTasks = $teachingTasks.total
         Schedules     = @($schedulePlans).Count
         ScheduleEntries = if ($null -ne $scheduleDetail) { @($scheduleDetail.entries).Count } else { 0 }
+        SelectionRounds = @($selectionRounds).Count
+        SelectionOfferings = @($selectionOfferings).Count
+        StudentEnrollments = $activeEnrollments.Count
+        RosterStudents = $selectionRoster.enrolledCount
         AccessUpdate  = $true
         ScopeChecks   = $scopeChecks -join ', '
         StaticIndex  = $frontend.Content.Contains('明序教务管理系统')

src/Jiaowu.Api/Controllers/CourseSelectionsController.cs

@@ -0,0 +1,746 @@
+using System.ComponentModel.DataAnnotations;
+using System.Data;
+using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.CourseSelection;
+using Jiaowu.Api.Infrastructure.Persistence;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace Jiaowu.Api.Controllers;
+
+[ApiController]
+[Authorize]
+[Route("api/course-selections")]
+public sealed class CourseSelectionsController(
+    AppDbContext db,
+    ICurrentUserDataScope currentUserDataScope) : ControllerBase
+{
+    private const string RoundManagers =
+        SystemRoles.SuperAdmin + "," +
+        SystemRoles.AcademicAdmin;
+
+    private const string OfferingManagers =
+        SystemRoles.SuperAdmin + "," +
+        SystemRoles.AcademicAdmin + "," +
+        SystemRoles.CollegeAdmin;
+
+    private const string SelectionUsers =
+        OfferingManagers + "," +
+        SystemRoles.Student;
+
+    private const string RosterReaders =
+        OfferingManagers + "," +
+        SystemRoles.Teacher;
+
+    [HttpGet("rounds")]
+    [Authorize(Roles = SelectionUsers)]
+    public async Task<ActionResult> GetRounds(
+        Guid? academicTermId,
+        CancellationToken cancellationToken)
+    {
+        var source = db.CourseSelectionRounds.AsNoTracking().AsQueryable();
+        if (academicTermId.HasValue)
+            source = source.Where(x => x.AcademicTermId == academicTermId);
+        if (currentUserDataScope.Current.IsInRole(SystemRoles.Student))
+            source = source.Where(x => x.Status != CourseSelectionRoundStatus.Draft);
+
+        var now = DateTime.UtcNow;
+        return Ok(await source
+            .OrderByDescending(x => x.AcademicTerm!.StartDate)
+            .ThenByDescending(x => x.StartsAt)
+            .Select(x => new
+            {
+                x.Id,
+                x.Name,
+                x.AcademicTermId,
+                TermName = x.AcademicTerm!.Name,
+                x.StartsAt,
+                x.EndsAt,
+                x.WithdrawalEndsAt,
+                x.MaxCredits,
+                x.Status,
+                IsAvailableNow =
+                    x.Status == CourseSelectionRoundStatus.Open &&
+                    now >= x.StartsAt &&
+                    now <= x.EndsAt,
+                OfferingCount = x.Offerings.Count,
+                x.Notes,
+                x.UpdatedAt
+            })
+            .ToListAsync(cancellationToken));
+    }
+
+    [HttpPost("rounds")]
+    [Authorize(Roles = RoundManagers)]
+    public async Task<ActionResult> CreateRound(
+        CourseSelectionRoundRequest request,
+        CancellationToken cancellationToken)
+    {
+        var validation = await ValidateRoundAsync(request, cancellationToken);
+        if (validation is not null) return validation;
+        var round = new CourseSelectionRound
+        {
+            AcademicTermId = request.AcademicTermId,
+            Name = request.Name.Trim(),
+            StartsAt = request.StartsAt.ToUniversalTime(),
+            EndsAt = request.EndsAt.ToUniversalTime(),
+            WithdrawalEndsAt = request.WithdrawalEndsAt.ToUniversalTime(),
+            MaxCredits = request.MaxCredits,
+            Notes = Normalize(request.Notes)
+        };
+        db.CourseSelectionRounds.Add(round);
+        return await SaveAsync(round.Id, true, cancellationToken);
+    }
+
+    [HttpPut("rounds/{id:guid}")]
+    [Authorize(Roles = RoundManagers)]
+    public async Task<ActionResult> UpdateRound(
+        Guid id,
+        CourseSelectionRoundRequest request,
+        CancellationToken cancellationToken)
+    {
+        var round = await db.CourseSelectionRounds.FindAsync([id], cancellationToken);
+        if (round is null) return NotFound();
+        if (round.Status != CourseSelectionRoundStatus.Draft)
+            return ConflictProblem("只有草稿选课批次可以修改。");
+        var validation = await ValidateRoundAsync(request, cancellationToken);
+        if (validation is not null) return validation;
+        round.AcademicTermId = request.AcademicTermId;
+        round.Name = request.Name.Trim();
+        round.StartsAt = request.StartsAt.ToUniversalTime();
+        round.EndsAt = request.EndsAt.ToUniversalTime();
+        round.WithdrawalEndsAt = request.WithdrawalEndsAt.ToUniversalTime();
+        round.MaxCredits = request.MaxCredits;
+        round.Notes = Normalize(request.Notes);
+        return await SaveAsync(id, false, cancellationToken);
+    }
+
+    [HttpDelete("rounds/{id:guid}")]
+    [Authorize(Roles = RoundManagers)]
+    public async Task<ActionResult> DeleteRound(Guid id, CancellationToken cancellationToken)
+    {
+        var round = await db.CourseSelectionRounds.FindAsync([id], cancellationToken);
+        if (round is null) return NotFound();
+        if (round.Status != CourseSelectionRoundStatus.Draft)
+            return ConflictProblem("只有草稿选课批次可以删除。");
+        db.CourseSelectionRounds.Remove(round);
+        return await SaveAsync(id, false, cancellationToken);
+    }
+
+    [HttpPost("rounds/{id:guid}/open")]
+    [Authorize(Roles = RoundManagers)]
+    public async Task<ActionResult> OpenRound(Guid id, CancellationToken cancellationToken)
+    {
+        var round = await db.CourseSelectionRounds
+            .Include(x => x.Offerings)
+            .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
+        if (round is null) return NotFound();
+        if (round.Status != CourseSelectionRoundStatus.Draft)
+            return ConflictProblem("只有草稿选课批次可以开放。");
+        if (round.Offerings.Count == 0)
+            return ConflictProblem("至少配置一个可选教学班后才能开放。");
+        round.Status = CourseSelectionRoundStatus.Open;
+        return await SaveAsync(id, false, cancellationToken);
+    }
+
+    [HttpPost("rounds/{id:guid}/close")]
+    [Authorize(Roles = RoundManagers)]
+    public async Task<ActionResult> CloseRound(Guid id, CancellationToken cancellationToken)
+    {
+        var round = await db.CourseSelectionRounds.FindAsync([id], cancellationToken);
+        if (round is null) return NotFound();
+        if (round.Status != CourseSelectionRoundStatus.Open)
+            return ConflictProblem("只有开放中的选课批次可以关闭。");
+        round.Status = CourseSelectionRoundStatus.Closed;
+        return await SaveAsync(id, false, cancellationToken);
+    }
+
+    [HttpGet("rounds/{roundId:guid}/offerings")]
+    [Authorize(Roles = OfferingManagers)]
+    public async Task<ActionResult> GetOfferings(
+        Guid roundId,
+        CancellationToken cancellationToken)
+    {
+        var source = ScopedOfferings()
+            .AsNoTracking()
+            .Where(x => x.CourseSelectionRoundId == roundId);
+        return Ok(await source
+            .OrderBy(x => x.TeachingTask!.Course!.Code)
+            .ThenBy(x => x.TeachingTask!.TaskNumber)
+            .Select(x => new
+            {
+                x.Id,
+                x.CourseSelectionRoundId,
+                x.TeachingTaskId,
+                x.TeachingTask!.TaskNumber,
+                TaskName = x.TeachingTask.Name,
+                CourseCode = x.TeachingTask.Course!.Code,
+                CourseName = x.TeachingTask.Course.Name,
+                CollegeName = x.TeachingTask.Course.College!.Name,
+                x.TeachingTask.Course.Credits,
+                TeacherNames = x.TeachingTask.Teachers
+                    .OrderByDescending(item => item.IsPrimary)
+                    .Select(item => item.Teacher!.Name),
+                ClassNames = x.TeachingTask.Classes
+                    .Select(item => item.AdministrativeClass!.Name),
+                x.Capacity,
+                EnrolledCount = x.Enrollments.Count(item =>
+                    item.Status == CourseEnrollmentStatus.Enrolled),
+                x.IsOpenToAll,
+                x.Notes,
+                x.UpdatedAt
+            })
+            .ToListAsync(cancellationToken));
+    }
+
+    [HttpPost("rounds/{roundId:guid}/offerings")]
+    [Authorize(Roles = OfferingManagers)]
+    public async Task<ActionResult> CreateOffering(
+        Guid roundId,
+        CourseSelectionOfferingRequest request,
+        CancellationToken cancellationToken)
+    {
+        var round = await db.CourseSelectionRounds.FindAsync([roundId], cancellationToken);
+        if (round is null) return NotFound();
+        if (round.Status != CourseSelectionRoundStatus.Draft)
+            return ConflictProblem("选课批次开放后不能调整教学班。");
+        var task = await FindAccessibleTaskAsync(request.TeachingTaskId, cancellationToken);
+        var validation = ValidateOffering(round, task, request);
+        if (validation is not null) return validation;
+        var offering = new CourseSelectionOffering
+        {
+            CourseSelectionRoundId = roundId,
+            TeachingTaskId = request.TeachingTaskId,
+            Capacity = request.Capacity,
+            IsOpenToAll = request.IsOpenToAll,
+            Notes = Normalize(request.Notes)
+        };
+        db.CourseSelectionOfferings.Add(offering);
+        return await SaveAsync(offering.Id, true, cancellationToken);
+    }
+
+    [HttpPut("rounds/{roundId:guid}/offerings/{id:guid}")]
+    [Authorize(Roles = OfferingManagers)]
+    public async Task<ActionResult> UpdateOffering(
+        Guid roundId,
+        Guid id,
+        CourseSelectionOfferingRequest request,
+        CancellationToken cancellationToken)
+    {
+        var offering = await ScopedOfferings()
+            .Include(x => x.CourseSelectionRound)
+            .FirstOrDefaultAsync(
+                x => x.Id == id && x.CourseSelectionRoundId == roundId,
+                cancellationToken);
+        if (offering is null) return NotFound();
+        if (offering.CourseSelectionRound!.Status != CourseSelectionRoundStatus.Draft)
+            return ConflictProblem("选课批次开放后不能调整教学班。");
+        var task = await FindAccessibleTaskAsync(request.TeachingTaskId, cancellationToken);
+        var validation = ValidateOffering(offering.CourseSelectionRound, task, request);
+        if (validation is not null) return validation;
+        offering.TeachingTaskId = request.TeachingTaskId;
+        offering.Capacity = request.Capacity;
+        offering.IsOpenToAll = request.IsOpenToAll;
+        offering.Notes = Normalize(request.Notes);
+        return await SaveAsync(id, false, cancellationToken);
+    }
+
+    [HttpDelete("rounds/{roundId:guid}/offerings/{id:guid}")]
+    [Authorize(Roles = OfferingManagers)]
+    public async Task<ActionResult> DeleteOffering(
+        Guid roundId,
+        Guid id,
+        CancellationToken cancellationToken)
+    {
+        var offering = await ScopedOfferings()
+            .Include(x => x.CourseSelectionRound)
+            .FirstOrDefaultAsync(
+                x => x.Id == id && x.CourseSelectionRoundId == roundId,
+                cancellationToken);
+        if (offering is null) return NotFound();
+        if (offering.CourseSelectionRound!.Status != CourseSelectionRoundStatus.Draft)
+            return ConflictProblem("选课批次开放后不能调整教学班。");
+        db.CourseSelectionOfferings.Remove(offering);
+        return await SaveAsync(id, false, cancellationToken);
+    }
+
+    [HttpGet("offerings/{id:guid}/roster")]
+    [Authorize(Roles = RosterReaders)]
+    public async Task<ActionResult> GetRoster(Guid id, CancellationToken cancellationToken)
+    {
+        var offering = await db.CourseSelectionOfferings.AsNoTracking()
+            .Where(x => x.Id == id)
+            .Select(x => new
+            {
+                x.Id,
+                x.TeachingTaskId,
+                x.TeachingTask!.TaskNumber,
+                TaskName = x.TeachingTask.Name,
+                CourseName = x.TeachingTask.Course!.Name,
+                CollegeId = x.TeachingTask.Course.CollegeId,
+                TeacherUserIds = x.TeachingTask.Teachers
+                    .Select(item => item.Teacher!.UserId),
+                x.Capacity
+            })
+            .FirstOrDefaultAsync(cancellationToken);
+        if (offering is null) return NotFound();
+        var scope = currentUserDataScope.Current;
+        var isAssignedTeacher =
+            scope.IsInRole(SystemRoles.Teacher) &&
+            offering.TeacherUserIds.Contains(scope.UserId);
+        if (!isAssignedTeacher && !scope.CanAccessCollege(offering.CollegeId))
+            return Forbid();
+
+        var students = await db.CourseEnrollments.AsNoTracking()
+            .Where(x =>
+                x.CourseSelectionOfferingId == id &&
+                x.Status == CourseEnrollmentStatus.Enrolled)
+            .OrderBy(x => x.Student!.StudentNumber)
+            .Select(x => new
+            {
+                x.Id,
+                x.StudentId,
+                x.Student!.StudentNumber,
+                x.Student.Name,
+                ClassName = x.Student.AdministrativeClass!.Name,
+                MajorName = x.Student.AdministrativeClass.Major!.Name,
+                x.EnrolledAt
+            })
+            .ToListAsync(cancellationToken);
+        return Ok(new
+        {
+            offering.Id,
+            offering.TeachingTaskId,
+            offering.TaskNumber,
+            offering.TaskName,
+            offering.CourseName,
+            offering.Capacity,
+            EnrolledCount = students.Count,
+            Students = students
+        });
+    }
+
+    [HttpGet("student/options")]
+    [Authorize(Roles = SystemRoles.Student)]
+    public async Task<ActionResult> GetStudentOptions(
+        Guid roundId,
+        CancellationToken cancellationToken)
+    {
+        var student = await CurrentStudentAsync(cancellationToken);
+        if (student is null) return ProfileNotFound();
+        var round = await db.CourseSelectionRounds.AsNoTracking()
+            .FirstOrDefaultAsync(x => x.Id == roundId, cancellationToken);
+        if (round is null || round.Status == CourseSelectionRoundStatus.Draft)
+            return NotFound();
+
+        var offerings = await db.CourseSelectionOfferings.AsNoTracking()
+            .Where(x =>
+                x.CourseSelectionRoundId == roundId &&
+                x.TeachingTask!.Status == TeachingTaskStatus.Published &&
+                (x.IsOpenToAll ||
+                 x.TeachingTask.Classes.Any(item =>
+                     item.AdministrativeClassId == student.AdministrativeClassId)))
+            .OrderBy(x => x.TeachingTask!.Course!.Code)
+            .Select(x => new StudentOfferingDto(
+                x.Id,
+                x.TeachingTaskId,
+                x.TeachingTask!.TaskNumber,
+                x.TeachingTask.Course!.Code,
+                x.TeachingTask.Course.Name,
+                x.TeachingTask.Course.Credits,
+                x.TeachingTask.Teachers
+                    .OrderByDescending(item => item.IsPrimary)
+                    .Select(item => item.Teacher!.Name),
+                x.Capacity,
+                x.Enrollments.Count(item =>
+                    item.Status == CourseEnrollmentStatus.Enrolled),
+                x.IsOpenToAll,
+                x.Enrollments
+                    .Where(item => item.StudentId == student.Id)
+                    .Select(item => (CourseEnrollmentStatus?)item.Status)
+                    .FirstOrDefault(),
+                db.ScheduleEntries
+                    .Where(entry =>
+                        entry.TeachingTaskId == x.TeachingTaskId &&
+                        entry.SchedulePlan!.AcademicTermId == round.AcademicTermId &&
+                        entry.SchedulePlan.Status == SchedulePlanStatus.Published)
+                    .OrderBy(entry => entry.DayOfWeek)
+                    .ThenBy(entry => entry.StartPeriod)
+                    .Select(entry => new StudentScheduleDto(
+                        entry.DayOfWeek,
+                        entry.StartPeriod,
+                        entry.PeriodCount,
+                        entry.StartWeek,
+                        entry.EndWeek,
+                        entry.WeekPattern,
+                        entry.Classroom!.Name))
+                    .ToList()))
+            .ToListAsync(cancellationToken);
+
+        return Ok(new
+        {
+            Round = new
+            {
+                round.Id,
+                round.Name,
+                round.StartsAt,
+                round.EndsAt,
+                round.WithdrawalEndsAt,
+                round.MaxCredits,
+                round.Status,
+                IsAvailableNow = CourseSelectionRules.IsSelectionOpen(
+                    round,
+                    DateTime.UtcNow)
+            },
+            Student = new
+            {
+                student.Id,
+                student.StudentNumber,
+                student.Name,
+                ClassName = student.AdministrativeClass!.Name
+            },
+            Offerings = offerings
+        });
+    }
+
+    [HttpGet("student/enrollments")]
+    [Authorize(Roles = SystemRoles.Student)]
+    public async Task<ActionResult> GetStudentEnrollments(
+        Guid? academicTermId,
+        CancellationToken cancellationToken)
+    {
+        var student = await CurrentStudentAsync(cancellationToken);
+        if (student is null) return ProfileNotFound();
+        var source = db.CourseEnrollments.AsNoTracking()
+            .Where(x => x.StudentId == student.Id);
+        if (academicTermId.HasValue)
+        {
+            source = source.Where(x =>
+                x.CourseSelectionOffering!.CourseSelectionRound!.AcademicTermId ==
+                academicTermId);
+        }
+        return Ok(await source
+            .OrderByDescending(x => x.EnrolledAt)
+            .Select(x => new
+            {
+                x.Id,
+                x.CourseSelectionOfferingId,
+                RoundId = x.CourseSelectionOffering!.CourseSelectionRoundId,
+                RoundName = x.CourseSelectionOffering.CourseSelectionRound!.Name,
+                TermName = x.CourseSelectionOffering.CourseSelectionRound.AcademicTerm!.Name,
+                x.CourseSelectionOffering.TeachingTaskId,
+                TaskNumber = x.CourseSelectionOffering.TeachingTask!.TaskNumber,
+                CourseCode = x.CourseSelectionOffering.TeachingTask.Course!.Code,
+                CourseName = x.CourseSelectionOffering.TeachingTask.Course.Name,
+                x.CourseSelectionOffering.TeachingTask.Course.Credits,
+                TeacherNames = x.CourseSelectionOffering.TeachingTask.Teachers
+                    .OrderByDescending(item => item.IsPrimary)
+                    .Select(item => item.Teacher!.Name),
+                x.Status,
+                x.EnrolledAt,
+                x.WithdrawnAt,
+                CanWithdraw =
+                    x.Status == CourseEnrollmentStatus.Enrolled &&
+                    x.CourseSelectionOffering.CourseSelectionRound.Status ==
+                        CourseSelectionRoundStatus.Open &&
+                    DateTime.UtcNow <=
+                        x.CourseSelectionOffering.CourseSelectionRound.WithdrawalEndsAt
+            })
+            .ToListAsync(cancellationToken));
+    }
+
+    [HttpPost("student/enrollments")]
+    [Authorize(Roles = SystemRoles.Student)]
+    public async Task<ActionResult> Enroll(
+        StudentEnrollmentRequest request,
+        CancellationToken cancellationToken)
+    {
+        var student = await CurrentStudentAsync(cancellationToken);
+        if (student is null) return ProfileNotFound();
+        if (student.Status != StudentStatus.Active)
+            return ConflictProblem("只有在籍学生可以选课。");
+
+        await using var transaction = await db.Database.BeginTransactionAsync(
+            IsolationLevel.Serializable,
+            cancellationToken);
+        var offering = await db.CourseSelectionOfferings
+            .Include(x => x.CourseSelectionRound)
+            .Include(x => x.TeachingTask)
+            .ThenInclude(x => x!.Course)
+            .Include(x => x.TeachingTask)
+            .ThenInclude(x => x!.Classes)
+            .FirstOrDefaultAsync(x => x.Id == request.OfferingId, cancellationToken);
+        if (offering is null) return NotFound();
+        var round = offering.CourseSelectionRound!;
+        var task = offering.TeachingTask!;
+        var now = DateTime.UtcNow;
+        if (!CourseSelectionRules.IsSelectionOpen(round, now))
+            return ConflictProblem("当前不在该选课批次的开放时间内。");
+        if (task.Status != TeachingTaskStatus.Published)
+            return ConflictProblem("该教学班当前不可选。");
+        if (!offering.IsOpenToAll &&
+            !task.Classes.Any(x =>
+                x.AdministrativeClassId == student.AdministrativeClassId))
+            return Forbid();
+
+        var existing = await db.CourseEnrollments.FirstOrDefaultAsync(
+            x =>
+                x.CourseSelectionOfferingId == offering.Id &&
+                x.StudentId == student.Id,
+            cancellationToken);
+        if (existing?.Status == CourseEnrollmentStatus.Enrolled)
+            return ConflictProblem("你已经选择了该教学班。");
+        var enrolledCount = await db.CourseEnrollments.CountAsync(
+            x =>
+                x.CourseSelectionOfferingId == offering.Id &&
+                x.Status == CourseEnrollmentStatus.Enrolled,
+            cancellationToken);
+        if (enrolledCount >= offering.Capacity)
+            return ConflictProblem("该教学班名额已满。");
+
+        var duplicateCourse = await db.CourseEnrollments.AnyAsync(
+            x =>
+                x.StudentId == student.Id &&
+                x.Status == CourseEnrollmentStatus.Enrolled &&
+                x.CourseSelectionOffering!.TeachingTask!.CourseId == task.CourseId &&
+                x.CourseSelectionOffering.CourseSelectionRound!.AcademicTermId ==
+                    round.AcademicTermId,
+            cancellationToken);
+        if (duplicateCourse)
+            return ConflictProblem("同一学期不能重复选择相同课程。");
+
+        var selectedCredits = await db.CourseEnrollments
+            .Where(x =>
+                x.StudentId == student.Id &&
+                x.Status == CourseEnrollmentStatus.Enrolled &&
+                x.CourseSelectionOffering!.CourseSelectionRoundId == round.Id)
+            .SumAsync(
+                x => (decimal?)x.CourseSelectionOffering!.TeachingTask!.Course!.Credits,
+                cancellationToken) ?? 0;
+        if (selectedCredits + task.Course!.Credits > round.MaxCredits)
+        {
+            return ConflictProblem(
+                $"选课后将达到 {selectedCredits + task.Course.Credits:0.#} 学分，超过本轮 {round.MaxCredits:0.#} 学分上限。");
+        }
+
+        var candidateEntries = await PublishedScheduleEntries(
+            round.AcademicTermId,
+            [task.Id],
+            cancellationToken);
+        if (candidateEntries.Count == 0)
+            return ConflictProblem("该教学班尚未发布课表，暂时不能选课。");
+        var selectedTaskIds = await db.CourseEnrollments
+            .Where(x =>
+                x.StudentId == student.Id &&
+                x.Status == CourseEnrollmentStatus.Enrolled &&
+                x.CourseSelectionOffering!.CourseSelectionRound!.AcademicTermId ==
+                    round.AcademicTermId)
+            .Select(x => x.CourseSelectionOffering!.TeachingTaskId)
+            .Distinct()
+            .ToArrayAsync(cancellationToken);
+        var selectedEntries = await PublishedScheduleEntries(
+            round.AcademicTermId,
+            selectedTaskIds,
+            cancellationToken);
+        if (CourseSelectionRules.HasScheduleConflict(candidateEntries, selectedEntries))
+            return ConflictProblem("该教学班与已选课程的上课时间冲突。");
+
+        if (existing is null)
+        {
+            existing = new CourseEnrollment
+            {
+                CourseSelectionOfferingId = offering.Id,
+                StudentId = student.Id
+            };
+            db.CourseEnrollments.Add(existing);
+        }
+        else
+        {
+            existing.Status = CourseEnrollmentStatus.Enrolled;
+            existing.EnrolledAt = now;
+            existing.WithdrawnAt = null;
+        }
+        await db.SaveChangesAsync(cancellationToken);
+        await transaction.CommitAsync(cancellationToken);
+        return Created(string.Empty, new { existing.Id });
+    }
+
+    [HttpDelete("student/enrollments/{id:guid}")]
+    [Authorize(Roles = SystemRoles.Student)]
+    public async Task<ActionResult> Withdraw(Guid id, CancellationToken cancellationToken)
+    {
+        var student = await CurrentStudentAsync(cancellationToken);
+        if (student is null) return ProfileNotFound();
+        var enrollment = await db.CourseEnrollments
+            .Include(x => x.CourseSelectionOffering)
+            .ThenInclude(x => x!.CourseSelectionRound)
+            .FirstOrDefaultAsync(
+                x => x.Id == id && x.StudentId == student.Id,
+                cancellationToken);
+        if (enrollment is null) return NotFound();
+        if (enrollment.Status != CourseEnrollmentStatus.Enrolled)
+            return ConflictProblem("该课程已经退选。");
+        if (!CourseSelectionRules.CanWithdraw(
+                enrollment.CourseSelectionOffering!.CourseSelectionRound!,
+                DateTime.UtcNow))
+            return ConflictProblem("当前批次已停止退课。");
+        enrollment.Status = CourseEnrollmentStatus.Withdrawn;
+        enrollment.WithdrawnAt = DateTime.UtcNow;
+        return await SaveAsync(id, false, cancellationToken);
+    }
+
+    private IQueryable<CourseSelectionOffering> ScopedOfferings()
+    {
+        var source = db.CourseSelectionOfferings.AsQueryable();
+        var scope = currentUserDataScope.Current;
+        return scope.Scope == DataScope.All
+            ? source
+            : source.Where(x =>
+                x.TeachingTask!.Course!.CollegeId == scope.RestrictedCollegeId);
+    }
+
+    private async Task<TeachingTask?> FindAccessibleTaskAsync(
+        Guid id,
+        CancellationToken cancellationToken)
+    {
+        var scope = currentUserDataScope.Current;
+        var source = db.TeachingTasks.AsNoTracking().AsQueryable();
+        if (scope.Scope != DataScope.All)
+        {
+            source = source.Where(x =>
+                x.Course!.CollegeId == scope.RestrictedCollegeId);
+        }
+        return await source
+            .Include(x => x.Course)
+            .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
+    }
+
+    private ActionResult? ValidateOffering(
+        CourseSelectionRound round,
+        TeachingTask? task,
+        CourseSelectionOfferingRequest request)
+    {
+        if (task is null) return ValidationProblem("所选教学班不存在或超出数据范围。");
+        if (task.AcademicTermId != round.AcademicTermId)
+            return ValidationProblem("教学班与选课批次必须属于同一学期。");
+        if (task.Status != TeachingTaskStatus.Published)
+            return ValidationProblem("只有已发布的教学班可以进入选课。");
+        if (request.Capacity > task.Capacity)
+            return ValidationProblem($"选课容量不能超过教学班容量 {task.Capacity}。");
+        return null;
+    }
+
+    private async Task<ActionResult?> ValidateRoundAsync(
+        CourseSelectionRoundRequest request,
+        CancellationToken cancellationToken)
+    {
+        var startsAt = request.StartsAt.ToUniversalTime();
+        var endsAt = request.EndsAt.ToUniversalTime();
+        var withdrawalEndsAt = request.WithdrawalEndsAt.ToUniversalTime();
+        if (startsAt >= endsAt)
+            return ValidationProblem("选课开始时间必须早于结束时间。");
+        if (withdrawalEndsAt < endsAt)
+            return ValidationProblem("退课截止时间不能早于选课结束时间。");
+        if (!await db.AcademicTerms.AnyAsync(
+                x => x.Id == request.AcademicTermId && x.IsEnabled,
+                cancellationToken))
+            return ValidationProblem("所选学期不存在或已停用。");
+        return null;
+    }
+
+    private async Task<Student?> CurrentStudentAsync(
+        CancellationToken cancellationToken)
+    {
+        var userId = currentUserDataScope.Current.UserId;
+        return await db.Students
+            .Include(x => x.AdministrativeClass)
+            .FirstOrDefaultAsync(x => x.UserId == userId, cancellationToken);
+    }
+
+    private async Task<List<ScheduleEntry>> PublishedScheduleEntries(
+        Guid academicTermId,
+        IReadOnlyCollection<Guid> taskIds,
+        CancellationToken cancellationToken)
+    {
+        if (taskIds.Count == 0) return [];
+        return await db.ScheduleEntries.AsNoTracking()
+            .Where(x =>
+                taskIds.Contains(x.TeachingTaskId) &&
+                x.SchedulePlan!.AcademicTermId == academicTermId &&
+                x.SchedulePlan.Status == SchedulePlanStatus.Published)
+            .ToListAsync(cancellationToken);
+    }
+
+    private async Task<ActionResult> SaveAsync(
+        Guid id,
+        bool created,
+        CancellationToken cancellationToken)
+    {
+        try
+        {
+            await db.SaveChangesAsync(cancellationToken);
+            return created ? Created(string.Empty, new { id }) : NoContent();
+        }
+        catch (DbUpdateException)
+        {
+            return ConflictProblem("记录重复、容量已变化，或关联数据已失效。");
+        }
+    }
+
+    private ActionResult ProfileNotFound() =>
+        ConflictProblem("当前账号未关联有效学生档案，请联系教务管理员。");
+
+    private ActionResult ConflictProblem(string detail) =>
+        Conflict(new ProblemDetails
+        {
+            Title = "无法完成选课操作",
+            Detail = detail,
+            Status = StatusCodes.Status409Conflict
+        });
+
+    private static string? Normalize(string? value) =>
+        string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+}
+
+public sealed record CourseSelectionRoundRequest(
+    Guid AcademicTermId,
+    [Required, MaxLength(120)] string Name,
+    DateTime StartsAt,
+    DateTime EndsAt,
+    DateTime WithdrawalEndsAt,
+    [Range(typeof(decimal), "0.5", "99")] decimal MaxCredits,
+    [MaxLength(500)] string? Notes);
+
+public sealed record CourseSelectionOfferingRequest(
+    Guid TeachingTaskId,
+    [Range(1, 10000)] int Capacity,
+    bool IsOpenToAll,
+    [MaxLength(500)] string? Notes);
+
+public sealed record StudentEnrollmentRequest(Guid OfferingId);
+
+public sealed record StudentOfferingDto(
+    Guid Id,
+    Guid TeachingTaskId,
+    string TaskNumber,
+    string CourseCode,
+    string CourseName,
+    decimal Credits,
+    IEnumerable<string> TeacherNames,
+    int Capacity,
+    int EnrolledCount,
+    bool IsOpenToAll,
+    CourseEnrollmentStatus? EnrollmentStatus,
+    IEnumerable<StudentScheduleDto> Schedules);
+
+public sealed record StudentScheduleDto(
+    int DayOfWeek,
+    int StartPeriod,
+    int PeriodCount,
+    int StartWeek,
+    int EndWeek,
+    WeekPattern WeekPattern,
+    string ClassroomName);

src/Jiaowu.Api/Controllers/DashboardController.cs

@@ -1,3 +1,4 @@
+using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
@@ -35,6 +36,14 @@ public sealed class DashboardController(AppDbContext db) : ControllerBase
                 CurriculumPlans = await db.CurriculumPlans.CountAsync(cancellationToken),
                 TeachingTasks = await db.TeachingTasks.CountAsync(cancellationToken),
                 SchedulePlans = await db.SchedulePlans.CountAsync(cancellationToken),
+                CourseSelectionRounds = await db.CourseSelectionRounds
+                    .CountAsync(cancellationToken),
+                CourseSelectionOfferings = await db.CourseSelectionOfferings
+                    .CountAsync(cancellationToken),
+                CourseEnrollments = await db.CourseEnrollments
+                    .CountAsync(
+                        x => x.Status == CourseEnrollmentStatus.Enrolled,
+                        cancellationToken),
                 Users = await db.Users.CountAsync(cancellationToken)
             }
         };

src/Jiaowu.Api/Domain/Academic/CourseSelectionEntities.cs

@@ -0,0 +1,54 @@
+using Jiaowu.Api.Domain.Common;
+
+namespace Jiaowu.Api.Domain.Academic;
+
+public sealed class CourseSelectionRound : EntityBase
+{
+    public Guid AcademicTermId { get; set; }
+    public AcademicTerm? AcademicTerm { get; set; }
+    public required string Name { get; set; }
+    public DateTime StartsAt { get; set; }
+    public DateTime EndsAt { get; set; }
+    public DateTime WithdrawalEndsAt { get; set; }
+    public decimal MaxCredits { get; set; } = 30;
+    public CourseSelectionRoundStatus Status { get; set; } =
+        CourseSelectionRoundStatus.Draft;
+    public string? Notes { get; set; }
+    public ICollection<CourseSelectionOffering> Offerings { get; set; } = [];
+}
+
+public sealed class CourseSelectionOffering : EntityBase
+{
+    public Guid CourseSelectionRoundId { get; set; }
+    public CourseSelectionRound? CourseSelectionRound { get; set; }
+    public Guid TeachingTaskId { get; set; }
+    public TeachingTask? TeachingTask { get; set; }
+    public int Capacity { get; set; }
+    public bool IsOpenToAll { get; set; }
+    public string? Notes { get; set; }
+    public ICollection<CourseEnrollment> Enrollments { get; set; } = [];
+}
+
+public sealed class CourseEnrollment : EntityBase
+{
+    public Guid CourseSelectionOfferingId { get; set; }
+    public CourseSelectionOffering? CourseSelectionOffering { get; set; }
+    public Guid StudentId { get; set; }
+    public Student? Student { get; set; }
+    public CourseEnrollmentStatus Status { get; set; } = CourseEnrollmentStatus.Enrolled;
+    public DateTime EnrolledAt { get; set; } = DateTime.UtcNow;
+    public DateTime? WithdrawnAt { get; set; }
+}
+
+public enum CourseSelectionRoundStatus
+{
+    Draft = 1,
+    Open = 2,
+    Closed = 3
+}
+
+public enum CourseEnrollmentStatus
+{
+    Enrolled = 1,
+    Withdrawn = 2
+}

src/Jiaowu.Api/Infrastructure/CourseSelection/CourseSelectionRules.cs

@@ -0,0 +1,23 @@
+using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Infrastructure.Scheduling;
+
+namespace Jiaowu.Api.Infrastructure.CourseSelection;
+
+public static class CourseSelectionRules
+{
+    public static bool IsSelectionOpen(CourseSelectionRound round, DateTime nowUtc) =>
+        round.Status == CourseSelectionRoundStatus.Open &&
+        nowUtc >= round.StartsAt &&
+        nowUtc <= round.EndsAt;
+
+    public static bool CanWithdraw(CourseSelectionRound round, DateTime nowUtc) =>
+        round.Status == CourseSelectionRoundStatus.Open &&
+        nowUtc <= round.WithdrawalEndsAt;
+
+    public static bool HasScheduleConflict(
+        IEnumerable<ScheduleEntry> candidateEntries,
+        IEnumerable<ScheduleEntry> selectedEntries) =>
+        candidateEntries.Any(candidate =>
+            selectedEntries.Any(selected =>
+                ScheduleConflictDetector.TimeOverlaps(candidate, selected)));
+}

src/Jiaowu.Api/Infrastructure/Persistence/AppDbContext.cs

@@ -28,6 +28,11 @@ public sealed class AppDbContext(DbContextOptions<AppDbContext> options)
     public DbSet<TeachingTaskClass> TeachingTaskClasses => Set<TeachingTaskClass>();
     public DbSet<SchedulePlan> SchedulePlans => Set<SchedulePlan>();
     public DbSet<ScheduleEntry> ScheduleEntries => Set<ScheduleEntry>();
+    public DbSet<CourseSelectionRound> CourseSelectionRounds =>
+        Set<CourseSelectionRound>();
+    public DbSet<CourseSelectionOffering> CourseSelectionOfferings =>
+        Set<CourseSelectionOffering>();
+    public DbSet<CourseEnrollment> CourseEnrollments => Set<CourseEnrollment>();
     public DbSet<AuditLog> AuditLogs => Set<AuditLog>();
 
     protected override void OnModelCreating(ModelBuilder builder)
@@ -267,6 +272,51 @@ public sealed class AppDbContext(DbContextOptions<AppDbContext> options)
                 .OnDelete(DeleteBehavior.Restrict);
         });
 
+        builder.Entity<CourseSelectionRound>(entity =>
+        {
+            entity.Property(x => x.Name).HasMaxLength(120);
+            entity.Property(x => x.MaxCredits).HasPrecision(6, 1);
+            entity.Property(x => x.Notes).HasMaxLength(500);
+            entity.HasIndex(x => new { x.AcademicTermId, x.Status });
+            entity.HasOne(x => x.AcademicTerm)
+                .WithMany()
+                .HasForeignKey(x => x.AcademicTermId)
+                .OnDelete(DeleteBehavior.Restrict);
+        });
+
+        builder.Entity<CourseSelectionOffering>(entity =>
+        {
+            entity.Property(x => x.Notes).HasMaxLength(500);
+            entity.HasIndex(x => new
+            {
+                x.CourseSelectionRoundId,
+                x.TeachingTaskId
+            }).IsUnique();
+            entity.HasOne(x => x.CourseSelectionRound)
+                .WithMany(x => x.Offerings)
+                .HasForeignKey(x => x.CourseSelectionRoundId)
+                .OnDelete(DeleteBehavior.Cascade);
+            entity.HasOne(x => x.TeachingTask)
+                .WithMany()
+                .HasForeignKey(x => x.TeachingTaskId)
+                .OnDelete(DeleteBehavior.Restrict);
+        });
+
+        builder.Entity<CourseEnrollment>(entity =>
+        {
+            entity.HasIndex(x => new { x.CourseSelectionOfferingId, x.StudentId })
+                .IsUnique();
+            entity.HasIndex(x => new { x.StudentId, x.Status });
+            entity.HasOne(x => x.CourseSelectionOffering)
+                .WithMany(x => x.Enrollments)
+                .HasForeignKey(x => x.CourseSelectionOfferingId)
+                .OnDelete(DeleteBehavior.Cascade);
+            entity.HasOne(x => x.Student)
+                .WithMany()
+                .HasForeignKey(x => x.StudentId)
+                .OnDelete(DeleteBehavior.Restrict);
+        });
+
         builder.Entity<AuditLog>(entity =>
         {
             entity.Property(x => x.Method).HasMaxLength(10);

src/Jiaowu.Api/Infrastructure/Persistence/DatabaseInitializer.cs

@@ -421,6 +421,42 @@ public sealed class DatabaseInitializer(
         }
 
         await SeedDevelopmentUsersAsync(computerCollege.Id);
+        await SeedDevelopmentCourseSelectionAsync();
+    }
+
+    private async Task SeedDevelopmentCourseSelectionAsync()
+    {
+        if (await db.CourseSelectionRounds.AnyAsync())
+        {
+            return;
+        }
+
+        var term = await db.AcademicTerms.SingleAsync(x => x.IsCurrent);
+        var task = await db.TeachingTasks.SingleAsync(
+            x => x.TaskNumber == "2026-1-CS101-01");
+        var now = DateTime.UtcNow;
+        db.CourseSelectionRounds.Add(new CourseSelectionRound
+        {
+            AcademicTermId = term.Id,
+            Name = "2026—2027 学年第一学期第一轮选课",
+            StartsAt = now.AddDays(-2),
+            EndsAt = now.AddDays(14),
+            WithdrawalEndsAt = now.AddDays(21),
+            MaxCredits = 30,
+            Status = CourseSelectionRoundStatus.Open,
+            Notes = "本地开发演示轮次，可用于验证选课、退课和教学班名单。",
+            Offerings =
+            [
+                new CourseSelectionOffering
+                {
+                    TeachingTaskId = task.Id,
+                    Capacity = 60,
+                    IsOpenToAll = false,
+                    Notes = "面向计科 2026-1 班开放。"
+                }
+            ]
+        });
+        await db.SaveChangesAsync();
     }
 
     private async Task SeedDevelopmentUsersAsync(Guid collegeId)

src/Jiaowu.Api/Infrastructure/Persistence/DevelopmentSqliteMigrator.cs

@@ -11,6 +11,7 @@ public sealed class DevelopmentSqliteMigrator(
     private const string TeachingTasksMigration = "20260724_03_teaching_tasks";
     private const string SchedulesMigration = "20260724_04_schedules";
     private const string ClassCounselorMigration = "20260724_05_class_counselor";
+    private const string CourseSelectionMigration = "20260724_06_course_selection";
 
     public async Task MigrateAsync(CancellationToken cancellationToken = default)
     {
@@ -58,6 +59,10 @@ public sealed class DevelopmentSqliteMigrator(
                 ? ClassCounselorStatements.Skip(1)
                 : ClassCounselorStatements,
             cancellationToken);
+        await ApplyMigrationAsync(
+            CourseSelectionMigration,
+            CourseSelectionStatements,
+            cancellationToken);
     }
 
     private async Task ApplyMigrationAsync(
@@ -426,4 +431,79 @@ public sealed class DevelopmentSqliteMigrator(
             ON "AdministrativeClasses" ("CounselorUserId");
         """
     ];
+
+    private static readonly string[] CourseSelectionStatements =
+    [
+        """
+        CREATE TABLE IF NOT EXISTS "CourseSelectionRounds" (
+            "Id" TEXT NOT NULL CONSTRAINT "PK_CourseSelectionRounds" PRIMARY KEY,
+            "AcademicTermId" TEXT NOT NULL,
+            "Name" TEXT NOT NULL,
+            "StartsAt" TEXT NOT NULL,
+            "EndsAt" TEXT NOT NULL,
+            "WithdrawalEndsAt" TEXT NOT NULL,
+            "MaxCredits" TEXT NOT NULL,
+            "Status" INTEGER NOT NULL,
+            "Notes" TEXT NULL,
+            "CreatedAt" TEXT NOT NULL,
+            "UpdatedAt" TEXT NOT NULL,
+            CONSTRAINT "FK_CourseSelectionRounds_AcademicTerms_AcademicTermId"
+                FOREIGN KEY ("AcademicTermId") REFERENCES "AcademicTerms" ("Id") ON DELETE RESTRICT
+        );
+        """,
+        """
+        CREATE INDEX IF NOT EXISTS "IX_CourseSelectionRounds_AcademicTermId_Status"
+            ON "CourseSelectionRounds" ("AcademicTermId", "Status");
+        """,
+        """
+        CREATE TABLE IF NOT EXISTS "CourseSelectionOfferings" (
+            "Id" TEXT NOT NULL CONSTRAINT "PK_CourseSelectionOfferings" PRIMARY KEY,
+            "CourseSelectionRoundId" TEXT NOT NULL,
+            "TeachingTaskId" TEXT NOT NULL,
+            "Capacity" INTEGER NOT NULL,
+            "IsOpenToAll" INTEGER NOT NULL,
+            "Notes" TEXT NULL,
+            "CreatedAt" TEXT NOT NULL,
+            "UpdatedAt" TEXT NOT NULL,
+            CONSTRAINT "FK_CourseSelectionOfferings_CourseSelectionRounds_CourseSelectionRoundId"
+                FOREIGN KEY ("CourseSelectionRoundId") REFERENCES "CourseSelectionRounds" ("Id")
+                ON DELETE CASCADE,
+            CONSTRAINT "FK_CourseSelectionOfferings_TeachingTasks_TeachingTaskId"
+                FOREIGN KEY ("TeachingTaskId") REFERENCES "TeachingTasks" ("Id") ON DELETE RESTRICT
+        );
+        """,
+        """
+        CREATE UNIQUE INDEX IF NOT EXISTS "IX_CourseSelectionOfferings_CourseSelectionRoundId_TeachingTaskId"
+            ON "CourseSelectionOfferings" ("CourseSelectionRoundId", "TeachingTaskId");
+        """,
+        """
+        CREATE INDEX IF NOT EXISTS "IX_CourseSelectionOfferings_TeachingTaskId"
+            ON "CourseSelectionOfferings" ("TeachingTaskId");
+        """,
+        """
+        CREATE TABLE IF NOT EXISTS "CourseEnrollments" (
+            "Id" TEXT NOT NULL CONSTRAINT "PK_CourseEnrollments" PRIMARY KEY,
+            "CourseSelectionOfferingId" TEXT NOT NULL,
+            "StudentId" TEXT NOT NULL,
+            "Status" INTEGER NOT NULL,
+            "EnrolledAt" TEXT NOT NULL,
+            "WithdrawnAt" TEXT NULL,
+            "CreatedAt" TEXT NOT NULL,
+            "UpdatedAt" TEXT NOT NULL,
+            CONSTRAINT "FK_CourseEnrollments_CourseSelectionOfferings_CourseSelectionOfferingId"
+                FOREIGN KEY ("CourseSelectionOfferingId") REFERENCES "CourseSelectionOfferings" ("Id")
+                ON DELETE CASCADE,
+            CONSTRAINT "FK_CourseEnrollments_Students_StudentId"
+                FOREIGN KEY ("StudentId") REFERENCES "Students" ("Id") ON DELETE RESTRICT
+        );
+        """,
+        """
+        CREATE UNIQUE INDEX IF NOT EXISTS "IX_CourseEnrollments_CourseSelectionOfferingId_StudentId"
+            ON "CourseEnrollments" ("CourseSelectionOfferingId", "StudentId");
+        """,
+        """
+        CREATE INDEX IF NOT EXISTS "IX_CourseEnrollments_StudentId_Status"
+            ON "CourseEnrollments" ("StudentId", "Status");
+        """
+    ];
 }

src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/20260724070409_CourseSelection.cs

@@ -0,0 +1,145 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
+{
+    /// <inheritdoc />
+    public partial class CourseSelection : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "CourseSelectionRounds",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "char(36)", nullable: false),
+                    AcademicTermId = table.Column<Guid>(type: "char(36)", nullable: false),
+                    Name = table.Column<string>(type: "varchar(120)", maxLength: 120, nullable: false),
+                    StartsAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    EndsAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    WithdrawalEndsAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    MaxCredits = table.Column<decimal>(type: "decimal(6,1)", precision: 6, scale: 1, nullable: false),
+                    Status = table.Column<int>(type: "int", nullable: false),
+                    Notes = table.Column<string>(type: "varchar(500)", maxLength: 500, nullable: true),
+                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    UpdatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_CourseSelectionRounds", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_CourseSelectionRounds_AcademicTerms_AcademicTermId",
+                        column: x => x.AcademicTermId,
+                        principalTable: "AcademicTerms",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                })
+                .Annotation("MySQL:Charset", "utf8mb4");
+
+            migrationBuilder.CreateTable(
+                name: "CourseSelectionOfferings",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "char(36)", nullable: false),
+                    CourseSelectionRoundId = table.Column<Guid>(type: "char(36)", nullable: false),
+                    TeachingTaskId = table.Column<Guid>(type: "char(36)", nullable: false),
+                    Capacity = table.Column<int>(type: "int", nullable: false),
+                    IsOpenToAll = table.Column<bool>(type: "tinyint(1)", nullable: false),
+                    Notes = table.Column<string>(type: "varchar(500)", maxLength: 500, nullable: true),
+                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    UpdatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_CourseSelectionOfferings", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_CourseSelectionOfferings_CourseSelectionRounds_CourseSelecti~",
+                        column: x => x.CourseSelectionRoundId,
+                        principalTable: "CourseSelectionRounds",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_CourseSelectionOfferings_TeachingTasks_TeachingTaskId",
+                        column: x => x.TeachingTaskId,
+                        principalTable: "TeachingTasks",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                })
+                .Annotation("MySQL:Charset", "utf8mb4");
+
+            migrationBuilder.CreateTable(
+                name: "CourseEnrollments",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "char(36)", nullable: false),
+                    CourseSelectionOfferingId = table.Column<Guid>(type: "char(36)", nullable: false),
+                    StudentId = table.Column<Guid>(type: "char(36)", nullable: false),
+                    Status = table.Column<int>(type: "int", nullable: false),
+                    EnrolledAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    WithdrawnAt = table.Column<DateTime>(type: "datetime(6)", nullable: true),
+                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    UpdatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_CourseEnrollments", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_CourseEnrollments_CourseSelectionOfferings_CourseSelectionOf~",
+                        column: x => x.CourseSelectionOfferingId,
+                        principalTable: "CourseSelectionOfferings",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_CourseEnrollments_Students_StudentId",
+                        column: x => x.StudentId,
+                        principalTable: "Students",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                })
+                .Annotation("MySQL:Charset", "utf8mb4");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CourseEnrollments_CourseSelectionOfferingId_StudentId",
+                table: "CourseEnrollments",
+                columns: new[] { "CourseSelectionOfferingId", "StudentId" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CourseEnrollments_StudentId_Status",
+                table: "CourseEnrollments",
+                columns: new[] { "StudentId", "Status" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CourseSelectionOfferings_CourseSelectionRoundId_TeachingTask~",
+                table: "CourseSelectionOfferings",
+                columns: new[] { "CourseSelectionRoundId", "TeachingTaskId" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CourseSelectionOfferings_TeachingTaskId",
+                table: "CourseSelectionOfferings",
+                column: "TeachingTaskId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CourseSelectionRounds_AcademicTermId_Status",
+                table: "CourseSelectionRounds",
+                columns: new[] { "AcademicTermId", "Status" });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "CourseEnrollments");
+
+            migrationBuilder.DropTable(
+                name: "CourseSelectionOfferings");
+
+            migrationBuilder.DropTable(
+                name: "CourseSelectionRounds");
+        }
+    }
+}

src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/AppDbContextModelSnapshot.cs

@@ -382,6 +382,128 @@ namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
                     b.ToTable("Courses");
                 });
 
+            modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CourseEnrollment", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("char(36)");
+
+                    b.Property<Guid>("CourseSelectionOfferingId")
+                        .HasColumnType("char(36)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime>("EnrolledAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<int>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<Guid>("StudentId")
+                        .HasColumnType("char(36)");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime?>("WithdrawnAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CourseSelectionOfferingId", "StudentId")
+                        .IsUnique();
+
+                    b.HasIndex("StudentId", "Status");
+
+                    b.ToTable("CourseEnrollments");
+                });
+
+            modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CourseSelectionOffering", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("char(36)");
+
+                    b.Property<int>("Capacity")
+                        .HasColumnType("int");
+
+                    b.Property<Guid>("CourseSelectionRoundId")
+                        .HasColumnType("char(36)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<bool>("IsOpenToAll")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<string>("Notes")
+                        .HasMaxLength(500)
+                        .HasColumnType("varchar(500)");
+
+                    b.Property<Guid>("TeachingTaskId")
+                        .HasColumnType("char(36)");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TeachingTaskId");
+
+                    b.HasIndex("CourseSelectionRoundId", "TeachingTaskId")
+                        .IsUnique();
+
+                    b.ToTable("CourseSelectionOfferings");
+                });
+
+            modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CourseSelectionRound", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("char(36)");
+
+                    b.Property<Guid>("AcademicTermId")
+                        .HasColumnType("char(36)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime>("EndsAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<decimal>("MaxCredits")
+                        .HasPrecision(6, 1)
+                        .HasColumnType("decimal(6,1)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(120)
+                        .HasColumnType("varchar(120)");
+
+                    b.Property<string>("Notes")
+                        .HasMaxLength(500)
+                        .HasColumnType("varchar(500)");
+
+                    b.Property<DateTime>("StartsAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<int>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime>("WithdrawalEndsAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("AcademicTermId", "Status");
+
+                    b.ToTable("CourseSelectionRounds");
+                });
+
             modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CurriculumCourse", b =>
                 {
                     b.Property<Guid>("Id")
@@ -1218,6 +1340,55 @@ namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
                     b.Navigation("College");
                 });
 
+            modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CourseEnrollment", b =>
+                {
+                    b.HasOne("Jiaowu.Api.Domain.Academic.CourseSelectionOffering", "CourseSelectionOffering")
+                        .WithMany("Enrollments")
+                        .HasForeignKey("CourseSelectionOfferingId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Jiaowu.Api.Domain.Academic.Student", "Student")
+                        .WithMany()
+                        .HasForeignKey("StudentId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("CourseSelectionOffering");
+
+                    b.Navigation("Student");
+                });
+
+            modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CourseSelectionOffering", b =>
+                {
+                    b.HasOne("Jiaowu.Api.Domain.Academic.CourseSelectionRound", "CourseSelectionRound")
+                        .WithMany("Offerings")
+                        .HasForeignKey("CourseSelectionRoundId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Jiaowu.Api.Domain.Academic.TeachingTask", "TeachingTask")
+                        .WithMany()
+                        .HasForeignKey("TeachingTaskId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("CourseSelectionRound");
+
+                    b.Navigation("TeachingTask");
+                });
+
+            modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CourseSelectionRound", b =>
+                {
+                    b.HasOne("Jiaowu.Api.Domain.Academic.AcademicTerm", "AcademicTerm")
+                        .WithMany()
+                        .HasForeignKey("AcademicTermId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("AcademicTerm");
+                });
+
             modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CurriculumCourse", b =>
                 {
                     b.HasOne("Jiaowu.Api.Domain.Academic.Course", "Course")
@@ -1453,6 +1624,16 @@ namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
                     b.Navigation("Students");
                 });
 
+            modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CourseSelectionOffering", b =>
+                {
+                    b.Navigation("Enrollments");
+                });
+
+            modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CourseSelectionRound", b =>
+                {
+                    b.Navigation("Offerings");
+                });
+
             modelBuilder.Entity("Jiaowu.Api.Domain.Academic.CurriculumModule", b =>
                 {
                     b.Navigation("Courses");

tests/Jiaowu.Api.Tests/CourseSelectionRulesTests.cs

@@ -0,0 +1,82 @@
+using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Infrastructure.CourseSelection;
+
+namespace Jiaowu.Api.Tests;
+
+public sealed class CourseSelectionRulesTests
+{
+    [Fact]
+    public void Selection_requires_open_status_and_active_window()
+    {
+        var now = new DateTime(2026, 7, 24, 8, 0, 0, DateTimeKind.Utc);
+        var round = CreateRound(now.AddHours(-1), now.AddHours(1));
+
+        Assert.True(CourseSelectionRules.IsSelectionOpen(round, now));
+
+        round.Status = CourseSelectionRoundStatus.Closed;
+        Assert.False(CourseSelectionRules.IsSelectionOpen(round, now));
+
+        round.Status = CourseSelectionRoundStatus.Open;
+        Assert.False(CourseSelectionRules.IsSelectionOpen(round, now.AddHours(2)));
+    }
+
+    [Fact]
+    public void Withdrawal_respects_deadline()
+    {
+        var now = new DateTime(2026, 7, 24, 8, 0, 0, DateTimeKind.Utc);
+        var round = CreateRound(now.AddDays(-1), now.AddDays(1));
+        round.WithdrawalEndsAt = now.AddMinutes(30);
+
+        Assert.True(CourseSelectionRules.CanWithdraw(round, now));
+        Assert.False(CourseSelectionRules.CanWithdraw(round, now.AddHours(1)));
+    }
+
+    [Fact]
+    public void Schedule_conflict_detects_overlapping_weeks_and_periods()
+    {
+        var selected = CreateEntry(1, 1, 2, 1, 16, WeekPattern.All);
+        var overlapping = CreateEntry(1, 2, 2, 1, 16, WeekPattern.All);
+
+        Assert.True(CourseSelectionRules.HasScheduleConflict(
+            [overlapping],
+            [selected]));
+    }
+
+    [Fact]
+    public void Odd_and_even_week_entries_do_not_conflict()
+    {
+        var selected = CreateEntry(3, 5, 2, 1, 16, WeekPattern.Odd);
+        var candidate = CreateEntry(3, 5, 2, 1, 16, WeekPattern.Even);
+
+        Assert.False(CourseSelectionRules.HasScheduleConflict(
+            [candidate],
+            [selected]));
+    }
+
+    private static CourseSelectionRound CreateRound(DateTime startsAt, DateTime endsAt) =>
+        new()
+        {
+            Name = "第一轮选课",
+            StartsAt = startsAt,
+            EndsAt = endsAt,
+            WithdrawalEndsAt = endsAt.AddDays(1),
+            Status = CourseSelectionRoundStatus.Open
+        };
+
+    private static ScheduleEntry CreateEntry(
+        int dayOfWeek,
+        int startPeriod,
+        int periodCount,
+        int startWeek,
+        int endWeek,
+        WeekPattern weekPattern) =>
+        new()
+        {
+            DayOfWeek = dayOfWeek,
+            StartPeriod = startPeriod,
+            PeriodCount = periodCount,
+            StartWeek = startWeek,
+            EndWeek = endWeek,
+            WeekPattern = weekPattern
+        };
+}

web/src/components.d.ts

@@ -16,6 +16,7 @@ declare module 'vue' {
     ElCheckbox: typeof import('element-plus/es')['ElCheckbox']
     ElDatePicker: typeof import('element-plus/es')['ElDatePicker']
     ElDialog: typeof import('element-plus/es')['ElDialog']
+    ElDrawer: typeof import('element-plus/es')['ElDrawer']
     ElEmpty: typeof import('element-plus/es')['ElEmpty']
     ElForm: typeof import('element-plus/es')['ElForm']
     ElFormItem: typeof import('element-plus/es')['ElFormItem']

web/src/layouts/AdminLayout.vue

@@ -9,6 +9,7 @@ import {
   Reading,
   Tickets,
   Calendar,
+  CircleCheck,
   User,
   UserFilled,
 } from '@element-plus/icons-vue'
@@ -19,6 +20,16 @@ const router = useRouter()
 const auth = useAuthStore()
 const collapsed = ref(false)
 const mobileMenu = ref(false)
+const workspaceLabel = computed(() => {
+  const roles = auth.user?.roles ?? []
+  if (roles.includes('SuperAdmin')) return '系统全域管理'
+  if (roles.includes('AcademicAdmin')) return '校级教务管理'
+  if (roles.includes('CollegeAdmin')) return '学院教务管理'
+  if (roles.includes('Counselor')) return '辅导员班级工作'
+  if (roles.includes('Teacher')) return '教师教学工作'
+  if (roles.includes('Student')) return '学生学业服务'
+  return '教务工作台'
+})
 
 const pageTitle = computed(() => {
   const titles: Record<string, string> = {
@@ -29,6 +40,7 @@ const pageTitle = computed(() => {
     curriculum: '培养方案',
     'teaching-tasks': '教学任务',
     schedules: '排课与课表',
+    'course-selections': '选课与教学班',
     users: '用户与权限',
   }
   return titles[String(route.name)] ?? '教务管理'
@@ -57,7 +69,7 @@ onMounted(() => auth.refresh().catch(() => undefined))
 
       <div v-if="!collapsed" class="term-stamp">
         <span>当前工作区</span>
-        <b>校级教务管理</b>
+        <b>{{ workspaceLabel }}</b>
       </div>
 
       <el-menu
@@ -71,7 +83,10 @@ onMounted(() => auth.refresh().catch(() => undefined))
           <el-icon><DataAnalysis /></el-icon>
           <template #title>教务总览</template>
         </el-menu-item>
-        <el-menu-item index="/base-data">
+        <el-menu-item
+          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin'].includes(role))"
+          index="/base-data"
+        >
           <el-icon><OfficeBuilding /></el-icon>
           <template #title>基础数据</template>
         </el-menu-item>
@@ -107,6 +122,13 @@ onMounted(() => auth.refresh().catch(() => undefined))
           <el-icon><Calendar /></el-icon>
           <template #title>排课与课表</template>
         </el-menu-item>
+        <el-menu-item
+          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Student'].includes(role))"
+          index="/course-selections"
+        >
+          <el-icon><CircleCheck /></el-icon>
+          <template #title>{{ auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin'].includes(role)) ? '选课管理' : '学生选课' }}</template>
+        </el-menu-item>
         <el-menu-item v-if="auth.isSuperAdmin" index="/users">
           <el-icon><User /></el-icon>
           <template #title>用户与权限</template>
@@ -115,7 +137,7 @@ onMounted(() => auth.refresh().catch(() => undefined))
 
       <div v-if="!collapsed" class="phase-note">
         <span>第一阶段 · 核心可用版</span>
-        <p>主数据、培养方案与教学运行已就绪</p>
+        <p>教学运行、排课与学生选课已就绪</p>
       </div>
     </aside>
 

web/src/router/index.ts

@@ -25,6 +25,7 @@ const router = createRouter({
           path: 'base-data',
           name: 'base-data',
           component: () => import('../views/BaseDataView.vue'),
+          meta: { roles: ['SuperAdmin', 'AcademicAdmin'] },
         },
         {
           path: 'personnel',
@@ -57,6 +58,14 @@ const router = createRouter({
           component: () => import('../views/SchedulesView.vue'),
           meta: { roles: ['SuperAdmin', 'AcademicAdmin'] },
         },
+        {
+          path: 'course-selections',
+          name: 'course-selections',
+          component: () => import('../views/CourseSelectionView.vue'),
+          meta: {
+            roles: ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Student'],
+          },
+        },
         {
           path: 'users',
           name: 'users',
@@ -75,6 +84,15 @@ router.beforeEach((to) => {
     return { name: 'login', query: { redirect: to.fullPath } }
   }
   if (to.name === 'login' && auth.isLoggedIn) return { name: 'dashboard' }
+  if (
+    to.name === 'dashboard' &&
+    auth.user?.roles.includes('Student') &&
+    !auth.user.roles.some((role) =>
+      ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin'].includes(role),
+    )
+  ) {
+    return { name: 'course-selections' }
+  }
   const roles = to.meta.roles as string[] | undefined
   if (roles && !roles.some((role) => auth.user?.roles.includes(role))) {
     return { name: 'dashboard' }

web/src/style.css

@@ -249,6 +249,135 @@ button { cursor: pointer; }
 .schedule-card > button { position: absolute; right: 4px; top: 3px; border: none; color: #b9c4df; background: transparent; font-size: 14px; }
 .schedule-card > button:hover { color: white; }
 
+.selection-page { min-width: 0; }
+.selection-round-strip {
+  min-height: 104px; padding: 10px; display: flex; gap: 9px; overflow-x: auto;
+  border: 1px solid var(--line); background: white;
+}
+.selection-round-strip > button {
+  flex: 0 0 285px; min-height: 82px; padding: 13px 15px; display: grid;
+  grid-template-columns: 1fr auto; gap: 5px 12px; text-align: left;
+  border: 1px solid var(--line); border-left: 3px solid #bdc3ce;
+  color: var(--ink); background: #fafbfc;
+}
+.selection-round-strip > button:hover { background: white; }
+.selection-round-strip > button.active {
+  border-color: var(--indigo); border-left-color: #48c8b7;
+  color: white; background: linear-gradient(115deg, #1b3067, #294584);
+}
+.selection-round-strip span, .selection-round-strip small {
+  overflow: hidden; color: #868f9e; font-size: 9px; white-space: nowrap; text-overflow: ellipsis;
+}
+.selection-round-strip b {
+  grid-column: 1 / -1; overflow: hidden; font-family: "STZhongsong", "Songti SC", serif;
+  font-size: 14px; white-space: nowrap; text-overflow: ellipsis;
+}
+.selection-round-strip i {
+  align-self: start; padding: 3px 7px; border-radius: 10px;
+  color: #6d7583; background: #edf0f3; font-size: 9px; font-style: normal;
+}
+.selection-round-strip i.open { color: var(--teal); background: #e5f4f1; }
+.selection-round-strip > button.active span,
+.selection-round-strip > button.active small { color: #c6d0e8; }
+.selection-round-strip > button.active i { color: white; background: rgba(255,255,255,.14); }
+.selection-window {
+  min-height: 142px; display: grid; grid-template-columns: 105px minmax(300px, 1fr) auto;
+  align-items: stretch; color: white;
+  background:
+    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
+    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px),
+    linear-gradient(112deg, #162858, #243d7d 70%, #176b70);
+  background-size: 28px 28px, 28px 28px, auto;
+  overflow: hidden;
+}
+.window-seal {
+  padding: 20px 12px; display: grid; place-content: center; justify-items: center; gap: 9px;
+  border-right: 1px solid rgba(255,255,255,.13); color: #57d4c2;
+}
+.window-seal .el-icon { font-size: 26px; }
+.window-seal span { font-size: 10px; font-weight: 700; letter-spacing: .08em; }
+.window-copy { padding: 24px 27px; align-self: center; min-width: 0; }
+.window-copy > span { color: #5ed4c4; font: 700 9px/1 Consolas, monospace; letter-spacing: .15em; }
+.window-copy h3 {
+  margin: 9px 0 8px; overflow: hidden; font-family: "STZhongsong", "Songti SC", serif;
+  font-size: 22px; font-weight: 500; letter-spacing: .03em; white-space: nowrap; text-overflow: ellipsis;
+}
+.window-copy p { margin: 0; color: #c4cee8; font-size: 10px; }
+.window-copy em {
+  margin-left: 13px; padding-left: 13px; border-left: 1px solid rgba(255,255,255,.2);
+  color: #edcf9a; font-style: normal;
+}
+.credit-meter {
+  width: 310px; padding: 22px 28px; align-self: center;
+  border-left: 1px solid rgba(255,255,255,.13);
+}
+.credit-meter > div:first-child { display: flex; align-items: baseline; gap: 7px; }
+.credit-meter span, .credit-meter small { color: #c2cce5; font-size: 10px; }
+.credit-meter b { margin-left: auto; color: #5bd4c3; font: 700 34px/1 Consolas, monospace; }
+.credit-track { height: 5px; margin-top: 12px; overflow: hidden; background: rgba(255,255,255,.15); }
+.credit-track i { height: 100%; display: block; background: linear-gradient(90deg, #49c9b7, #e3ad54); }
+.credit-meter p { margin: 9px 0 0; color: #aeb9d8; font-size: 9px; }
+.round-actions {
+  width: 285px; padding: 23px; display: flex; flex-wrap: wrap; align-content: center;
+  justify-content: flex-end; gap: 8px; border-left: 1px solid rgba(255,255,255,.13);
+}
+.round-actions .el-button + .el-button { margin-left: 0; }
+.selection-ledger-head {
+  min-height: 95px; padding: 18px 21px; display: flex; align-items: center;
+  justify-content: space-between; gap: 20px; border-bottom: 1px solid var(--line);
+}
+.selection-ledger-head span { color: var(--teal); font: 700 9px/1 Consolas, monospace; letter-spacing: .14em; }
+.selection-ledger-head h3 { margin: 7px 0 4px; font-family: "STZhongsong", "Songti SC", serif; font-size: 19px; }
+.selection-ledger-head p { margin: 0; color: var(--muted); font-size: 10px; }
+.capacity-number { color: var(--indigo); font: 700 13px/1 Consolas, monospace; }
+.offering-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; }
+.offering-ticket {
+  min-width: 0; min-height: 250px; display: flex; flex-direction: column;
+  border: 1px solid var(--line); background: white; box-shadow: 0 6px 18px rgba(24,36,68,.045);
+}
+.offering-ticket > header {
+  min-height: 99px; padding: 19px 20px; display: flex; justify-content: space-between;
+  gap: 16px; border-bottom: 1px dashed #d7dce4; position: relative;
+}
+.offering-ticket > header::before,
+.offering-ticket > header::after {
+  content: ""; position: absolute; bottom: -7px; width: 12px; height: 12px;
+  border-radius: 50%; background: var(--soft);
+}
+.offering-ticket > header::before { left: -7px; }
+.offering-ticket > header::after { right: -7px; }
+.offering-ticket header span { color: var(--teal); font: 700 9px/1 Consolas, monospace; letter-spacing: .08em; }
+.offering-ticket h3 {
+  margin: 8px 0 6px; font-family: "STZhongsong", "Songti SC", serif;
+  font-size: 20px; font-weight: 600;
+}
+.offering-ticket header p { margin: 0; color: var(--muted); font-size: 11px; }
+.selected-mark {
+  flex: 0 0 auto; height: fit-content; padding: 5px 9px; display: flex; align-items: center; gap: 4px;
+  border-radius: 13px; color: var(--teal); background: #e8f5f2; font-size: 10px; font-style: normal;
+}
+.ticket-schedules { min-height: 85px; padding: 14px 20px; display: grid; align-content: center; gap: 8px; }
+.ticket-schedules > div { display: flex; align-items: flex-start; gap: 7px; color: #4e596d; font-size: 10px; line-height: 1.5; }
+.ticket-schedules .el-icon { flex: 0 0 auto; margin-top: 1px; color: var(--indigo); }
+.schedule-missing { color: #a36d22; font-size: 10px; }
+.offering-ticket > footer {
+  margin-top: auto; min-height: 65px; padding: 13px 20px; display: flex; align-items: center;
+  gap: 18px; background: #fafbfc; border-top: 1px solid #edf0f4;
+}
+.seat-meter { flex: 1; min-width: 0; }
+.seat-meter > span { display: block; margin-bottom: 7px; color: var(--muted); font-size: 9px; }
+.seat-meter > div { height: 4px; overflow: hidden; background: #e2e6ec; }
+.seat-meter i { height: 100%; display: block; background: var(--teal); }
+.roster-summary {
+  margin: 0 0 18px; padding: 16px; display: flex; align-items: center; gap: 14px;
+  color: white; background: linear-gradient(115deg, #1b3067, #294584);
+}
+.roster-summary > .el-icon { font-size: 28px; color: #5bd4c3; }
+.roster-summary span, .roster-summary b, .roster-summary small { display: block; }
+.roster-summary span { color: #59d2c1; font: 700 9px Consolas, monospace; }
+.roster-summary b { margin-top: 5px; font-size: 14px; }
+.roster-summary small { margin-top: 4px; color: #bec8e2; font-size: 10px; }
+
 .login-page { min-height: 100vh; display: grid; grid-template-columns: minmax(440px, 1.2fr) minmax(420px, .8fr); background: white; }
 .login-story { min-height: 100vh; padding: 54px clamp(45px, 6vw, 90px); display: flex; flex-direction: column; color: white; background: linear-gradient(142deg, #13224d, #243a77 62%, #176b71); overflow: hidden; position: relative; }
 .login-story::before { content: ""; position: absolute; inset: 0; opacity: .28; background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px); background-size: 46px 46px; }
@@ -339,6 +468,13 @@ button { cursor: pointer; }
   .schedule-search { flex-wrap: wrap; }
   .schedule-search .el-input { width: 100%; }
   .schedule-search > span { width: 100%; margin-left: 0; }
+  .selection-window { grid-template-columns: 82px 1fr; }
+  .credit-meter, .round-actions {
+    grid-column: 1 / -1; width: auto; border-top: 1px solid rgba(255,255,255,.13);
+    border-left: none;
+  }
+  .round-actions { justify-content: flex-start; }
+  .offering-grid { grid-template-columns: 1fr; }
   .role-editor-summary { align-items: flex-start; flex-direction: column; gap: 4px; }
   .form-grid, .form-grid.three { grid-template-columns: 1fr; gap: 0; }
   .el-dialog { width: calc(100vw - 24px) !important; }
@@ -350,6 +486,21 @@ button { cursor: pointer; }
   .login-panel { padding: 32px 22px; background: white; }
 }
 
+@media (max-width: 600px) {
+  .selection-round-strip > button { flex-basis: 240px; }
+  .selection-window { display: block; }
+  .window-seal { min-height: 54px; padding: 10px; display: flex; border-right: none; border-bottom: 1px solid rgba(255,255,255,.13); }
+  .window-seal .el-icon { font-size: 18px; }
+  .window-copy { padding: 20px 18px; }
+  .window-copy h3 { white-space: normal; }
+  .window-copy em { display: block; margin: 7px 0 0; padding: 0; border: none; }
+  .credit-meter, .round-actions { padding: 18px; }
+  .selection-ledger-head { align-items: flex-start; flex-direction: column; }
+  .offering-ticket > footer { align-items: stretch; flex-direction: column; }
+  .offering-ticket > footer .el-button { width: 100%; }
+  .el-drawer { width: 100% !important; }
+}
+
 @media (prefers-reduced-motion: reduce) {
   *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
 }

web/src/views/CourseSelectionView.vue

@@ -0,0 +1,628 @@
+<script setup lang="ts">
+import { computed, onMounted, reactive, ref } from 'vue'
+import {
+  CircleCheck,
+  Clock,
+  Plus,
+  Refresh,
+  Tickets,
+  UserFilled,
+} from '@element-plus/icons-vue'
+import http, { apiErrorMessage } from '../api/http'
+import { useAuthStore } from '../stores/auth'
+
+const auth = useAuthStore()
+const managerRoles = ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin']
+const isManager = computed(() =>
+  auth.user?.roles.some((role) => managerRoles.includes(role)) ?? false,
+)
+const canManageRounds = computed(() =>
+  auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin'].includes(role)) ?? false,
+)
+const isStudent = computed(() => auth.user?.roles.includes('Student') && !isManager.value)
+const terms = ref<any[]>([])
+const rounds = ref<any[]>([])
+const selectedRound = ref<any | null>(null)
+const offerings = ref<any[]>([])
+const tasks = ref<any[]>([])
+const enrollments = ref<any[]>([])
+const loading = ref(false)
+const detailLoading = ref(false)
+const roundDialog = ref(false)
+const offeringDialog = ref(false)
+const rosterDrawer = ref(false)
+const editingRoundId = ref('')
+const editingOfferingId = ref('')
+const roster = ref<any | null>(null)
+const roundForm = reactive<Record<string, any>>({})
+const offeringForm = reactive<Record<string, any>>({})
+
+const statusLabels: Record<string, string> = {
+  Draft: '草稿',
+  Open: '开放中',
+  Closed: '已关闭',
+}
+const patternLabels: Record<string, string> = {
+  All: '每周',
+  Odd: '单周',
+  Even: '双周',
+}
+const weekdayLabels = ['', '周一', '周二', '周三', '周四', '周五', '周六', '周日']
+const selectedCredits = computed(() =>
+  offerings.value
+    .filter((item) => item.enrollmentStatus === 'Enrolled')
+    .reduce((sum, item) => sum + Number(item.credits), 0),
+)
+const creditPercent = computed(() => {
+  const maximum = Number(selectedRound.value?.maxCredits || 1)
+  return Math.min(100, Math.round((selectedCredits.value / maximum) * 100))
+})
+const selectedCount = computed(() =>
+  offerings.value.filter((item) => item.enrollmentStatus === 'Enrolled').length,
+)
+
+function formatDateTime(value: string) {
+  if (!value) return '—'
+  return new Intl.DateTimeFormat('zh-CN', {
+    month: '2-digit',
+    day: '2-digit',
+    hour: '2-digit',
+    minute: '2-digit',
+    hour12: false,
+  }).format(new Date(value))
+}
+
+function toPickerValue(value: string) {
+  if (!value) return ''
+  const date = new Date(value)
+  const pad = (number: number) => String(number).padStart(2, '0')
+  return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}:00`
+}
+
+function toIso(value: string) {
+  return new Date(value.replace(' ', 'T')).toISOString()
+}
+
+function formatSchedule(schedule: any) {
+  const periods = schedule.periodCount === 1
+    ? `第 ${schedule.startPeriod} 节`
+    : `第 ${schedule.startPeriod}—${schedule.startPeriod + schedule.periodCount - 1} 节`
+  return `${weekdayLabels[schedule.dayOfWeek]} ${periods} · ${schedule.startWeek}—${schedule.endWeek} 周${patternLabels[schedule.weekPattern] === '每周' ? '' : ` · ${patternLabels[schedule.weekPattern]}`} · ${schedule.classroomName}`
+}
+
+async function loadRounds(keepSelection = true) {
+  loading.value = true
+  try {
+    rounds.value = (await http.get('/course-selections/rounds')).data
+    const previousId = keepSelection ? selectedRound.value?.id : undefined
+    const preferred = rounds.value.find((item) => item.id === previousId)
+      ?? rounds.value.find((item) => item.isAvailableNow)
+      ?? rounds.value[0]
+    if (preferred) await selectRound(preferred)
+    else {
+      selectedRound.value = null
+      offerings.value = []
+    }
+  } catch (error) {
+    ElMessage.error(apiErrorMessage(error))
+  } finally {
+    loading.value = false
+  }
+}
+
+async function selectRound(round: any) {
+  selectedRound.value = round
+  detailLoading.value = true
+  try {
+    if (isStudent.value) {
+      const [optionResponse, enrollmentResponse] = await Promise.all([
+        http.get('/course-selections/student/options', { params: { roundId: round.id } }),
+        http.get('/course-selections/student/enrollments', {
+          params: { academicTermId: round.academicTermId },
+        }),
+      ])
+      offerings.value = optionResponse.data.offerings
+      enrollments.value = enrollmentResponse.data
+    } else {
+      offerings.value = (
+        await http.get(`/course-selections/rounds/${round.id}/offerings`)
+      ).data
+      if (round.status === 'Draft') await loadTasks(round.academicTermId)
+    }
+  } catch (error) {
+    ElMessage.error(apiErrorMessage(error))
+  } finally {
+    detailLoading.value = false
+  }
+}
+
+async function loadTasks(academicTermId: string) {
+  const { data } = await http.get('/teaching-tasks', {
+    params: {
+      academicTermId,
+      status: 'Published',
+      page: 1,
+      pageSize: 100,
+    },
+  })
+  tasks.value = data.items
+}
+
+function openRound(round?: any) {
+  editingRoundId.value = round?.id ?? ''
+  const currentTerm = terms.value.find((item) => item.isCurrent)
+  const now = new Date()
+  const ends = new Date(now.getTime() + 7 * 86400000)
+  const withdrawal = new Date(now.getTime() + 14 * 86400000)
+  Object.assign(roundForm, {
+    academicTermId: round?.academicTermId ?? currentTerm?.id,
+    name: round?.name ?? '',
+    startsAt: round ? toPickerValue(round.startsAt) : toPickerValue(now.toISOString()),
+    endsAt: round ? toPickerValue(round.endsAt) : toPickerValue(ends.toISOString()),
+    withdrawalEndsAt: round
+      ? toPickerValue(round.withdrawalEndsAt)
+      : toPickerValue(withdrawal.toISOString()),
+    maxCredits: round?.maxCredits ?? 30,
+    notes: round?.notes ?? '',
+  })
+  roundDialog.value = true
+}
+
+async function saveRound() {
+  if (!roundForm.academicTermId || !roundForm.name?.trim()) {
+    ElMessage.warning('请选择学期并填写批次名称。')
+    return
+  }
+  try {
+    const payload = {
+      ...roundForm,
+      startsAt: toIso(roundForm.startsAt),
+      endsAt: toIso(roundForm.endsAt),
+      withdrawalEndsAt: toIso(roundForm.withdrawalEndsAt),
+    }
+    if (editingRoundId.value) {
+      await http.put(`/course-selections/rounds/${editingRoundId.value}`, payload)
+    } else {
+      await http.post('/course-selections/rounds', payload)
+    }
+    roundDialog.value = false
+    ElMessage.success(editingRoundId.value ? '选课批次已更新' : '选课批次草稿已创建')
+    await loadRounds(false)
+  } catch (error) {
+    ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+async function deleteRound(round: any) {
+  try {
+    await ElMessageBox.confirm(`删除选课批次“${round.name}”？`, '删除草稿', {
+      type: 'warning',
+    })
+    await http.delete(`/course-selections/rounds/${round.id}`)
+    await loadRounds(false)
+  } catch (error: any) {
+    if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+async function openSelection(round: any) {
+  try {
+    await ElMessageBox.confirm(
+      '开放后批次及教学班配置将锁定，学生可在设置的时间窗口内选课。',
+      '开放选课',
+      { type: 'warning', confirmButtonText: '确认开放', cancelButtonText: '取消' },
+    )
+    await http.post(`/course-selections/rounds/${round.id}/open`)
+    ElMessage.success('选课批次已开放')
+    await loadRounds()
+  } catch (error: any) {
+    if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+async function closeSelection(round: any) {
+  try {
+    await ElMessageBox.confirm(
+      '关闭后学生将不能继续选课或退课，现有教学班名单会保留。',
+      '关闭选课',
+      { type: 'warning', confirmButtonText: '确认关闭', cancelButtonText: '取消' },
+    )
+    await http.post(`/course-selections/rounds/${round.id}/close`)
+    await loadRounds()
+  } catch (error: any) {
+    if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+function openOffering(offering?: any) {
+  editingOfferingId.value = offering?.id ?? ''
+  Object.assign(offeringForm, {
+    teachingTaskId: offering?.teachingTaskId,
+    capacity: offering?.capacity ?? 60,
+    isOpenToAll: offering?.isOpenToAll ?? false,
+    notes: offering?.notes ?? '',
+  })
+  offeringDialog.value = true
+}
+
+function onTaskChanged(taskId: string) {
+  const task = tasks.value.find((item) => item.id === taskId)
+  if (task) offeringForm.capacity = task.capacity
+}
+
+async function saveOffering() {
+  if (!offeringForm.teachingTaskId) {
+    ElMessage.warning('请选择要进入选课的教学班。')
+    return
+  }
+  try {
+    const base = `/course-selections/rounds/${selectedRound.value.id}/offerings`
+    if (editingOfferingId.value) {
+      await http.put(`${base}/${editingOfferingId.value}`, offeringForm)
+    } else {
+      await http.post(base, offeringForm)
+    }
+    offeringDialog.value = false
+    ElMessage.success(editingOfferingId.value ? '教学班配置已更新' : '教学班已加入本轮选课')
+    await selectRound(selectedRound.value)
+    await loadRounds()
+  } catch (error) {
+    ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+async function deleteOffering(offering: any) {
+  try {
+    await ElMessageBox.confirm(`从本轮移除“${offering.taskName}”？`, '移除教学班', {
+      type: 'warning',
+    })
+    await http.delete(
+      `/course-selections/rounds/${selectedRound.value.id}/offerings/${offering.id}`,
+    )
+    await selectRound(selectedRound.value)
+  } catch (error: any) {
+    if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+async function showRoster(offering: any) {
+  try {
+    roster.value = (
+      await http.get(`/course-selections/offerings/${offering.id}/roster`)
+    ).data
+    rosterDrawer.value = true
+  } catch (error) {
+    ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+async function enroll(offering: any) {
+  try {
+    await http.post('/course-selections/student/enrollments', {
+      offeringId: offering.id,
+    })
+    ElMessage.success(`已选“${offering.courseName}”`)
+    await selectRound(selectedRound.value)
+  } catch (error) {
+    ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+async function withdraw(offering: any) {
+  const enrollment = enrollments.value.find(
+    (item) =>
+      item.courseSelectionOfferingId === offering.id &&
+      item.status === 'Enrolled',
+  )
+  if (!enrollment) return
+  try {
+    await ElMessageBox.confirm(
+      `确定退选“${offering.courseName}”吗？名额释放后可能被其他同学选择。`,
+      '确认退课',
+      { type: 'warning', confirmButtonText: '确认退选', cancelButtonText: '暂不退选' },
+    )
+    await http.delete(`/course-selections/student/enrollments/${enrollment.id}`)
+    ElMessage.success('已退选')
+    await selectRound(selectedRound.value)
+  } catch (error: any) {
+    if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+onMounted(async () => {
+  try {
+    if (isManager.value) terms.value = (await http.get('/base-data/terms')).data
+    await loadRounds(false)
+  } catch (error) {
+    ElMessage.error(apiErrorMessage(error))
+  }
+})
+</script>
+
+<template>
+  <div class="page-stack selection-page">
+    <section class="page-intro">
+      <div>
+        <span class="section-kicker">COURSE REGISTRATION</span>
+        <h2>{{ isStudent ? '学生选课' : '选课管理' }}</h2>
+        <p v-if="isStudent">在开放时间内安排本学期课程，系统会实时校验容量、学分与上课时间。</p>
+        <p v-else>设置选课窗口、投放教学班，并以实时名单掌握教学班容量。</p>
+      </div>
+      <el-button v-if="canManageRounds" type="primary" :icon="Plus" @click="openRound()">
+        新建选课批次
+      </el-button>
+      <el-button v-else :icon="Refresh" @click="loadRounds()">刷新名额</el-button>
+    </section>
+
+    <section v-if="rounds.length" class="selection-round-strip" v-loading="loading">
+      <button
+        v-for="round in rounds"
+        :key="round.id"
+        type="button"
+        :class="{ active: selectedRound?.id === round.id }"
+        @click="selectRound(round)"
+      >
+        <span>{{ round.termName }}</span>
+        <b>{{ round.name }}</b>
+        <small>{{ formatDateTime(round.startsAt) }} — {{ formatDateTime(round.endsAt) }}</small>
+        <i :class="round.status.toLowerCase()">{{ statusLabels[round.status] }}</i>
+      </button>
+    </section>
+
+    <template v-if="selectedRound">
+      <section class="selection-window">
+        <div class="window-seal">
+          <el-icon><Clock /></el-icon>
+          <span>{{ selectedRound.isAvailableNow ? '正在开放' : statusLabels[selectedRound.status] }}</span>
+        </div>
+        <div class="window-copy">
+          <span>SELECTION WINDOW · {{ selectedRound.termName }}</span>
+          <h3>{{ selectedRound.name }}</h3>
+          <p>
+            选课 {{ formatDateTime(selectedRound.startsAt) }}—{{ formatDateTime(selectedRound.endsAt) }}
+            <em>退课截止 {{ formatDateTime(selectedRound.withdrawalEndsAt) }}</em>
+          </p>
+        </div>
+        <div v-if="isStudent" class="credit-meter">
+          <div>
+            <span>已选学分</span>
+            <b>{{ selectedCredits }}</b>
+            <small>/ {{ selectedRound.maxCredits }}</small>
+          </div>
+          <div class="credit-track"><i :style="{ width: `${creditPercent}%` }" /></div>
+          <p>{{ selectedCount }} 门课程 · 剩余可选 {{ Math.max(0, selectedRound.maxCredits - selectedCredits) }} 学分</p>
+        </div>
+        <div v-else class="round-actions">
+          <el-button
+            v-if="canManageRounds && selectedRound.status === 'Draft'"
+            @click="openRound(selectedRound)"
+          >编辑批次</el-button>
+          <el-button
+            v-if="canManageRounds && selectedRound.status === 'Draft'"
+            type="success"
+            @click="openSelection(selectedRound)"
+          >开放选课</el-button>
+          <el-button
+            v-if="canManageRounds && selectedRound.status === 'Open'"
+            type="warning"
+            @click="closeSelection(selectedRound)"
+          >关闭选课</el-button>
+          <el-button
+            v-if="canManageRounds && selectedRound.status === 'Draft'"
+            type="danger"
+            plain
+            @click="deleteRound(selectedRound)"
+          >删除草稿</el-button>
+        </div>
+      </section>
+
+      <section v-if="isManager" class="data-card" v-loading="detailLoading">
+        <div class="selection-ledger-head">
+          <div>
+            <span>OFFERING LEDGER</span>
+            <h3>本轮教学班</h3>
+            <p>{{ offerings.length }} 个教学班 · 开放后配置锁定，名单随学生选退实时更新</p>
+          </div>
+          <el-button
+            v-if="selectedRound.status === 'Draft'"
+            type="primary"
+            :icon="Plus"
+            @click="openOffering()"
+          >加入教学班</el-button>
+        </div>
+        <el-table :data="offerings" class="data-table">
+          <el-table-column label="教学班 / 课程" min-width="260">
+            <template #default="{ row }">
+              <div class="course-name">
+                <b>{{ row.taskName }}</b>
+                <span>{{ row.taskNumber }} · {{ row.courseCode }} {{ row.courseName }}</span>
+              </div>
+            </template>
+          </el-table-column>
+          <el-table-column label="教师 / 行政班" min-width="200">
+            <template #default="{ row }">
+              <div class="course-name">
+                <b>{{ row.teacherNames.join('、') || '未安排' }}</b>
+                <span>{{ row.isOpenToAll ? '全校开放' : row.classNames.join('、') }}</span>
+              </div>
+            </template>
+          </el-table-column>
+          <el-table-column label="学分" width="75" prop="credits" />
+          <el-table-column label="名单 / 容量" width="125">
+            <template #default="{ row }">
+              <b class="capacity-number">{{ row.enrolledCount }} / {{ row.capacity }}</b>
+            </template>
+          </el-table-column>
+          <el-table-column label="操作" width="190" fixed="right">
+            <template #default="{ row }">
+              <el-button link type="primary" @click="showRoster(row)">查看名单</el-button>
+              <el-button
+                v-if="selectedRound.status === 'Draft'"
+                link
+                type="primary"
+                @click="openOffering(row)"
+              >编辑</el-button>
+              <el-button
+                v-if="selectedRound.status === 'Draft'"
+                link
+                type="danger"
+                @click="deleteOffering(row)"
+              >移除</el-button>
+            </template>
+          </el-table-column>
+          <template #empty><el-empty description="本轮尚未加入教学班" /></template>
+        </el-table>
+      </section>
+
+      <section v-else class="offering-grid" v-loading="detailLoading">
+        <article v-for="offering in offerings" :key="offering.id" class="offering-ticket">
+          <header>
+            <div>
+              <span>{{ offering.courseCode }} · {{ offering.taskNumber }}</span>
+              <h3>{{ offering.courseName }}</h3>
+              <p>{{ offering.teacherNames.join('、') || '教师待定' }} · {{ offering.credits }} 学分</p>
+            </div>
+            <i v-if="offering.enrollmentStatus === 'Enrolled'" class="selected-mark">
+              <el-icon><CircleCheck /></el-icon> 已选
+            </i>
+          </header>
+          <div class="ticket-schedules">
+            <div v-for="schedule in offering.schedules" :key="formatSchedule(schedule)">
+              <el-icon><Tickets /></el-icon>
+              <span>{{ formatSchedule(schedule) }}</span>
+            </div>
+            <span v-if="!offering.schedules.length" class="schedule-missing">课表尚未发布</span>
+          </div>
+          <footer>
+            <div class="seat-meter">
+              <span>剩余 {{ Math.max(0, offering.capacity - offering.enrolledCount) }} / {{ offering.capacity }} 席</span>
+              <div><i :style="{ width: `${Math.min(100, offering.enrolledCount / offering.capacity * 100)}%` }" /></div>
+            </div>
+            <el-button
+              v-if="offering.enrollmentStatus === 'Enrolled'"
+              type="danger"
+              plain
+              :disabled="selectedRound.status !== 'Open'"
+              @click="withdraw(offering)"
+            >退选</el-button>
+            <el-button
+              v-else
+              type="primary"
+              :disabled="!selectedRound.isAvailableNow || offering.enrolledCount >= offering.capacity || !offering.schedules.length"
+              @click="enroll(offering)"
+            >{{ offering.enrollmentStatus === 'Withdrawn' ? '重新选择' : '选择课程' }}</el-button>
+          </footer>
+        </article>
+        <el-empty v-if="!offerings.length" description="本轮没有适合你所在班级的课程" />
+      </section>
+    </template>
+
+    <el-empty v-else-if="!loading" description="暂无选课批次" />
+
+    <el-dialog
+      v-model="roundDialog"
+      :title="editingRoundId ? '编辑选课批次' : '新建选课批次'"
+      width="720px"
+    >
+      <el-form label-position="top">
+        <div class="form-grid">
+          <el-form-item label="开课学期" required>
+            <el-select v-model="roundForm.academicTermId">
+              <el-option v-for="term in terms" :key="term.id" :label="term.name" :value="term.id" />
+            </el-select>
+          </el-form-item>
+          <el-form-item label="批次名称" required>
+            <el-input v-model="roundForm.name" placeholder="如 第一轮选课" />
+          </el-form-item>
+        </div>
+        <div class="form-grid">
+          <el-form-item label="选课开始时间" required>
+            <el-date-picker v-model="roundForm.startsAt" type="datetime" value-format="YYYY-MM-DD HH:mm:ss" />
+          </el-form-item>
+          <el-form-item label="选课结束时间" required>
+            <el-date-picker v-model="roundForm.endsAt" type="datetime" value-format="YYYY-MM-DD HH:mm:ss" />
+          </el-form-item>
+        </div>
+        <div class="form-grid">
+          <el-form-item label="退课截止时间" required>
+            <el-date-picker v-model="roundForm.withdrawalEndsAt" type="datetime" value-format="YYYY-MM-DD HH:mm:ss" />
+          </el-form-item>
+          <el-form-item label="本轮学分上限">
+            <el-input-number v-model="roundForm.maxCredits" :min="0.5" :max="99" :step="0.5" />
+          </el-form-item>
+        </div>
+        <el-form-item label="说明">
+          <el-input v-model="roundForm.notes" type="textarea" :rows="3" />
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="roundDialog = false">取消</el-button>
+        <el-button type="primary" @click="saveRound">保存草稿</el-button>
+      </template>
+    </el-dialog>
+
+    <el-dialog
+      v-model="offeringDialog"
+      :title="editingOfferingId ? '编辑教学班配置' : '加入教学班'"
+      width="620px"
+    >
+      <el-form label-position="top">
+        <el-form-item label="已发布教学班" required>
+          <el-select
+            v-model="offeringForm.teachingTaskId"
+            filterable
+            @change="onTaskChanged"
+          >
+            <el-option
+              v-for="task in tasks"
+              :key="task.id"
+              :label="`${task.taskNumber} · ${task.courseCode} ${task.courseName}`"
+              :value="task.id"
+            />
+          </el-select>
+        </el-form-item>
+        <div class="form-grid compact">
+          <el-form-item label="选课容量">
+            <el-input-number v-model="offeringForm.capacity" :min="1" />
+          </el-form-item>
+          <el-form-item label="选课对象">
+            <el-switch
+              v-model="offeringForm.isOpenToAll"
+              active-text="全校学生"
+              inactive-text="教学任务关联班级"
+            />
+          </el-form-item>
+        </div>
+        <el-form-item label="说明">
+          <el-input v-model="offeringForm.notes" type="textarea" :rows="2" />
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="offeringDialog = false">取消</el-button>
+        <el-button type="primary" @click="saveOffering">保存</el-button>
+      </template>
+    </el-dialog>
+
+    <el-drawer v-model="rosterDrawer" title="教学班名单" size="620px">
+      <template v-if="roster">
+        <div class="roster-summary">
+          <el-icon><UserFilled /></el-icon>
+          <div>
+            <span>{{ roster.taskNumber }}</span>
+            <b>{{ roster.taskName }}</b>
+            <small>{{ roster.enrolledCount }} / {{ roster.capacity }} 人</small>
+          </div>
+        </div>
+        <el-table :data="roster.students">
+          <el-table-column prop="studentNumber" label="学号" width="130" />
+          <el-table-column prop="name" label="姓名" width="90" />
+          <el-table-column prop="className" label="行政班" min-width="150" />
+          <el-table-column label="选课时间" min-width="130">
+            <template #default="{ row }">{{ formatDateTime(row.enrolledAt) }}</template>
+          </el-table-column>
+          <template #empty><el-empty description="暂无学生选课" /></template>
+        </el-table>
+      </template>
+    </el-drawer>
+  </div>
+</template>

web/src/views/DashboardView.vue

@@ -3,6 +3,7 @@ import { computed, onMounted, ref } from 'vue'
 import { useRouter } from 'vue-router'
 import { Collection, OfficeBuilding, School, UserFilled } from '@element-plus/icons-vue'
 import http from '../api/http'
+import { useAuthStore } from '../stores/auth'
 
 interface DashboardData {
   currentTerm?: { name: string; startDate: string; endDate: string }
@@ -10,6 +11,7 @@ interface DashboardData {
 }
 
 const router = useRouter()
+const auth = useAuthStore()
 const loading = ref(true)
 const data = ref<DashboardData>({ counts: {} })
 
@@ -40,7 +42,11 @@ onMounted(async () => {
         </p>
         <p v-else>请先在基础数据中建立学期档案。</p>
       </div>
-      <button type="button" @click="router.push('/base-data')">
+      <button
+        v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin'].includes(role))"
+        type="button"
+        @click="router.push('/base-data')"
+      >
         <span>维护学期与组织数据</span>
         <b>→</b>
       </button>
@@ -101,18 +107,24 @@ onMounted(async () => {
             <b>{{ data.counts.schedulePlans ?? 0 }} 个版本 · 冲突校验与发布</b>
             <i class="done">已建立</i>
           </div>
+          <div>
+            <span>学生选课</span>
+            <b>{{ data.counts.courseSelectionRounds ?? 0 }} 个批次 · {{ data.counts.courseEnrollments ?? 0 }} 条有效选课</b>
+            <i class="done">已建立</i>
+          </div>
         </div>
       </article>
 
       <article class="work-card phase-card">
         <span class="section-kicker">NEXT MILESTONE</span>
         <h3>下一段业务链</h3>
-        <p>排课与课表发布链路已就绪，下一步进入学生选课轮次、容量与候补管理。</p>
+        <p>选课批次、容量校验和教学班名单已就绪，下一步进入成绩录入、审核与学业档案。</p>
         <div class="phase-line">
           <span class="active">基础底座</span>
           <span class="active">人员档案</span>
           <span class="active">培养方案</span>
           <span class="active">排课课表</span>
+          <span class="active">学生选课</span>
         </div>
       </article>
     </section>