已修改完成，同时解决了“考生名单都是 0 人”的根因。

考生范围统一为“行政班关联学生 + 已选课学生”，并自动去重；考场分配、人数显示、冲突检测、学生考试安排均使用同一口径。[TeachingTaskRosterQuery.cs (line 40)](E:/jiaowu/src/Jiaowu.Api/Infrastructure/Teaching/TeachingTaskRosterQuery.cs:40)
新增考场签名单 Excel 导出接口。[ExamsController.cs (line 568)](E:/jiaowu/src/Jiaowu.Api/Controllers/ExamsController.cs:568)
考试计划页面新增“导出考场签名单”按钮。[ExamsView.vue (line 255)](E:/jiaowu/web/src/views/ExamsView.vue:255)
工作簿包含“考场汇总”以及每个考试场次独立的 A4 签到表，字段包括座位号、学号、姓名、行政班、考生签名和备注。[ExamSignInWorkbookExporter.cs (line 12)](E:/jiaowu/src/Jiaowu.Api/Infrastructure/Exams/ExamSignInWorkbookExporter.cs:12)
未分配考场或监考教师时，也能导出并显示“待分配”。

tests/Jiaowu.Api.Tests/TeachingWorkflowRosterTests.cs

@@ -1,7 +1,10 @@
+using ClosedXML.Excel;
 using Jiaowu.Api.Controllers;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
+using Jiaowu.Api.Infrastructure.Exams;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Data.Sqlite;
@@ -12,7 +15,7 @@ namespace Jiaowu.Api.Tests;
 public sealed class TeachingWorkflowRosterTests
 {
     [Fact]
-    public async Task ClassAssignedStudents_AppearAcrossTeacherWorkflows()
+    public async Task ClassAssignedStudents_AppearAcrossTeachingAndExamWorkflows()
     {
         await using var connection = new SqliteConnection("Data Source=:memory:");
         await connection.OpenAsync();
@@ -23,6 +26,7 @@ public sealed class TeachingWorkflowRosterTests
         await db.Database.EnsureCreatedAsync();
 
         var teacherUserId = Guid.NewGuid();
+        var studentUserId = Guid.NewGuid();
         var teacherUser = new ApplicationUser
         {
             Id = teacherUserId,
@@ -30,6 +34,13 @@ public sealed class TeachingWorkflowRosterTests
             NormalizedUserName = "T001",
             DisplayName = "张老师"
         };
+        var studentUser = new ApplicationUser
+        {
+            Id = studentUserId,
+            UserName = "202601001",
+            NormalizedUserName = "202601001",
+            DisplayName = "周同学"
+        };
         var college = new College { Code = "CS", Name = "计算机学院" };
         var major = new Major
         {
@@ -51,7 +62,8 @@ public sealed class TeachingWorkflowRosterTests
             Name = "周同学",
             AdministrativeClassId = administrativeClass.Id,
             EnrollmentYear = 2026,
-            EnrollmentDate = new DateOnly(2026, 9, 1)
+            EnrollmentDate = new DateOnly(2026, 9, 1),
+            UserId = studentUserId
         };
         var teacher = new Teacher
         {
@@ -107,6 +119,7 @@ public sealed class TeachingWorkflowRosterTests
         };
         db.AddRange(
             teacherUser,
+            studentUser,
             college,
             major,
             administrativeClass,
@@ -117,6 +130,28 @@ public sealed class TeachingWorkflowRosterTests
             task);
         await db.SaveChangesAsync();
 
+        var examPlan = new ExamPlan
+        {
+            AcademicTermId = term.Id,
+            Name = "期末考试",
+            Status = ExamPlanStatus.Published,
+            Sessions =
+            [
+                new ExamSession
+                {
+                    TeachingTaskId = task.Id,
+                    ExamDate = new DateOnly(2027, 1, 8),
+                    StartPeriod = 1,
+                    PeriodCount = 2,
+                    StartsAt = new DateTime(2027, 1, 8, 8, 0, 0, DateTimeKind.Utc),
+                    EndsAt = new DateTime(2027, 1, 8, 9, 50, 0, DateTimeKind.Utc),
+                    RequiredInvigilatorCount = 1
+                }
+            ]
+        };
+        db.ExamPlans.Add(examPlan);
+        await db.SaveChangesAsync();
+
         var scope = new TeacherDataScope(teacherUserId);
         var attendance = new AttendanceController(db, scope);
         var attendanceResult = await attendance.CreateSheet(
@@ -153,6 +188,39 @@ public sealed class TeachingWorkflowRosterTests
         Assert.Single(ReadItems(await adjustments.GetTaskOptions(
             term.Id,
             CancellationToken.None)));
+
+        var managerScope = new ManagerDataScope();
+        var exams = new ExamsController(
+            db,
+            managerScope,
+            new ExamArrangementService(db),
+            NoOpAppCache.Instance);
+        var planResult = Assert.IsType<OkObjectResult>(
+            await exams.GetPlan(examPlan.Id, CancellationToken.None));
+        var planSessions = ReadEnumerableProperty(planResult.Value!, "Sessions");
+        Assert.Equal(1, ReadIntProperty(planSessions.Single(), "StudentCount"));
+
+        var examSessionId = examPlan.Sessions.Single().Id;
+        var rosterResult = Assert.IsType<OkObjectResult>(
+            await exams.GetRoster(examSessionId, CancellationToken.None));
+        Assert.Single(ReadEnumerableProperty(rosterResult.Value!, "Students"));
+
+        var studentExams = new ExamsController(
+            db,
+            new StudentDataScope(studentUserId),
+            new ExamArrangementService(db),
+            NoOpAppCache.Instance);
+        Assert.Single(ReadItems(
+            await studentExams.GetMySchedule(CancellationToken.None)));
+
+        var exportResult = Assert.IsType<FileContentResult>(
+            await exams.ExportSignInSheets(examPlan.Id, CancellationToken.None));
+        using var workbookStream = new MemoryStream(exportResult.FileContents);
+        using var workbook = new XLWorkbook(workbookStream);
+        Assert.Equal(2, workbook.Worksheets.Count);
+        var signInSheet = workbook.Worksheets.Single(x => x.Name != "考场汇总");
+        Assert.Equal("202601001", signInSheet.Cell("C8").GetString());
+        Assert.Equal("周同学", signInSheet.Cell("D8").GetString());
     }
 
     private static List<object> ReadItems(ActionResult result)
@@ -166,6 +234,12 @@ public sealed class TeachingWorkflowRosterTests
     private static int ReadIntProperty(object value, string name) =>
         (int)value.GetType().GetProperty(name)!.GetValue(value)!;
 
+    private static List<object> ReadEnumerableProperty(object value, string name) =>
+        Assert.IsAssignableFrom<System.Collections.IEnumerable>(
+                value.GetType().GetProperty(name)!.GetValue(value))
+            .Cast<object>()
+            .ToList();
+
     private sealed class TeacherDataScope(Guid userId) : ICurrentUserDataScope
     {
         public CurrentUserScope Current { get; } = new(
@@ -175,4 +249,24 @@ public sealed class TeachingWorkflowRosterTests
             DataScope.Self,
             new HashSet<string>([SystemRoles.Teacher]));
     }
+
+    private sealed class StudentDataScope(Guid userId) : ICurrentUserDataScope
+    {
+        public CurrentUserScope Current { get; } = new(
+            userId,
+            "周同学",
+            null,
+            DataScope.Self,
+            new HashSet<string>([SystemRoles.Student]));
+    }
+
+    private sealed class ManagerDataScope : ICurrentUserDataScope
+    {
+        public CurrentUserScope Current { get; } = new(
+            Guid.NewGuid(),
+            "考试管理员",
+            null,
+            DataScope.All,
+            new HashSet<string>([SystemRoles.AcademicAdmin]));
+    }
 }