已完成教学任务归档纠错功能：

已归档任务新增“撤销归档”和“删除”，支持单条及批量操作。
撤销后恢复为“已发布”状态。
已发布任务仍不可直接删除；被排课、选课、成绩或考试引用的归档任务也会拒绝删除并明确提示。
状态与操作文案统一为“归档”

src/Jiaowu.Api/Controllers/TeachingTasksController.cs

@@ -228,10 +228,14 @@ public sealed class TeachingTasksController(
             .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
         if (task is null) return NotFound();
         if (!CanManage(task.Course!)) return Forbid();
-        if (task.Status != TeachingTaskStatus.Draft)
-            return ConflictProblem("仅草稿教学任务可以删除。");
+        if (task.Status is not (TeachingTaskStatus.Draft or TeachingTaskStatus.Closed))
+            return ConflictProblem("仅草稿或已归档的教学任务可以删除。");
         db.TeachingTasks.Remove(task);
-        return await SaveAsync(id, false, cancellationToken);
+        return await SaveAsync(
+            id,
+            false,
+            cancellationToken,
+            "教学任务已被排课、选课、成绩或考试等业务引用，不能删除；如需继续使用，可撤销归档。");
     }
 
     [HttpPost("{id:guid}/publish")]
@@ -263,11 +267,25 @@ public sealed class TeachingTasksController(
         if (task is null) return NotFound();
         if (!CanManage(task.Course!)) return Forbid();
         if (task.Status != TeachingTaskStatus.Published)
-            return ConflictProblem("只有已发布的教学任务可以结课。");
+            return ConflictProblem("只有已发布的教学任务可以归档。");
         task.Status = TeachingTaskStatus.Closed;
         return await SaveAsync(id, false, cancellationToken);
     }
 
+    [HttpPost("{id:guid}/unarchive")]
+    public async Task<ActionResult> Unarchive(Guid id, CancellationToken cancellationToken)
+    {
+        var task = await ScopedTasks()
+            .Include(x => x.Course)
+            .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
+        if (task is null) return NotFound();
+        if (!CanManage(task.Course!)) return Forbid();
+        if (task.Status != TeachingTaskStatus.Closed)
+            return ConflictProblem("只有已归档的教学任务可以撤销归档。");
+        task.Status = TeachingTaskStatus.Published;
+        return await SaveAsync(id, false, cancellationToken);
+    }
+
     [HttpPost("batch")]
     public async Task<ActionResult> Batch(
         TeachingTaskBatchRequest request,
@@ -305,9 +323,10 @@ public sealed class TeachingTasksController(
                 break;
             }
             case TeachingTaskBatchOperation.Delete:
-                if (tasks.Any(x => x.Status != TeachingTaskStatus.Draft))
+                if (tasks.Any(x =>
+                        x.Status is not (TeachingTaskStatus.Draft or TeachingTaskStatus.Closed)))
                     return ConflictProblem(
-                        $"教学任务“{tasks.First(x => x.Status != TeachingTaskStatus.Draft).Name}”不是草稿，整批未删除。");
+                        $"教学任务“{tasks.First(x => x.Status is not (TeachingTaskStatus.Draft or TeachingTaskStatus.Closed)).Name}”不是草稿或已归档状态，整批未删除。");
                 db.TeachingTasks.RemoveRange(tasks);
                 break;
             case TeachingTaskBatchOperation.Archive:
@@ -316,6 +335,12 @@ public sealed class TeachingTasksController(
                         $"教学任务“{tasks.First(x => x.Status != TeachingTaskStatus.Published).Name}”不是已发布状态，整批未归档。");
                 foreach (var task in tasks) task.Status = TeachingTaskStatus.Closed;
                 break;
+            case TeachingTaskBatchOperation.Unarchive:
+                if (tasks.Any(x => x.Status != TeachingTaskStatus.Closed))
+                    return ConflictProblem(
+                        $"教学任务“{tasks.First(x => x.Status != TeachingTaskStatus.Closed).Name}”不是已归档状态，整批未撤销归档。");
+                foreach (var task in tasks) task.Status = TeachingTaskStatus.Published;
+                break;
             default:
                 return ValidationProblem("不支持的批量操作。");
         }
@@ -664,7 +689,8 @@ public sealed class TeachingTasksController(
     private async Task<ActionResult> SaveAsync(
         Guid id,
         bool created,
-        CancellationToken cancellationToken)
+        CancellationToken cancellationToken,
+        string conflictMessage = "教学任务编号重复，或关联数据已失效。")
     {
         try
         {
@@ -673,7 +699,7 @@ public sealed class TeachingTasksController(
         }
         catch (DbUpdateException)
         {
-            return ConflictProblem("教学任务编号重复，或关联数据已失效。");
+            return ConflictProblem(conflictMessage);
         }
     }
 
@@ -739,5 +765,6 @@ public enum TeachingTaskBatchOperation
 {
     Publish = 1,
     Delete = 2,
-    Archive = 3
+    Archive = 3,
+    Unarchive = 4
 }

tests/Jiaowu.Api.Tests/TeachingTasksControllerTests.cs

@@ -0,0 +1,166 @@
+using Jiaowu.Api.Controllers;
+using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Persistence;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+
+namespace Jiaowu.Api.Tests;
+
+public sealed class TeachingTasksControllerTests
+{
+    [Fact]
+    public async Task Delete_AllowsArchivedTask_ButRejectsPublishedTask()
+    {
+        await using var database = await TestDatabase.CreateAsync();
+        var archived = await database.AddTaskAsync("ARCHIVED", TeachingTaskStatus.Closed);
+        var published = await database.AddTaskAsync("PUBLISHED", TeachingTaskStatus.Published);
+
+        var deleteArchived = await database.Controller.Delete(
+            archived.Id,
+            CancellationToken.None);
+        var deletePublished = await database.Controller.Delete(
+            published.Id,
+            CancellationToken.None);
+
+        Assert.IsType<NoContentResult>(deleteArchived);
+        Assert.IsType<ConflictObjectResult>(deletePublished);
+        Assert.False(await database.Db.TeachingTasks.AnyAsync(x => x.Id == archived.Id));
+        Assert.True(await database.Db.TeachingTasks.AnyAsync(x => x.Id == published.Id));
+    }
+
+    [Fact]
+    public async Task Unarchive_RestoresArchivedTaskToPublished()
+    {
+        await using var database = await TestDatabase.CreateAsync();
+        var task = await database.AddTaskAsync("RESTORE", TeachingTaskStatus.Closed);
+
+        var result = await database.Controller.Unarchive(task.Id, CancellationToken.None);
+
+        Assert.IsType<NoContentResult>(result);
+        await database.Db.Entry(task).ReloadAsync();
+        Assert.Equal(TeachingTaskStatus.Published, task.Status);
+    }
+
+    [Fact]
+    public async Task Batch_UnarchivesOnlyArchivedTasks()
+    {
+        await using var database = await TestDatabase.CreateAsync();
+        var first = await database.AddTaskAsync("FIRST", TeachingTaskStatus.Closed);
+        var second = await database.AddTaskAsync("SECOND", TeachingTaskStatus.Closed);
+
+        var result = await database.Controller.Batch(
+            new TeachingTaskBatchRequest(
+                TeachingTaskBatchOperation.Unarchive,
+                [first.Id, second.Id]),
+            CancellationToken.None);
+
+        Assert.IsType<OkObjectResult>(result);
+        Assert.All(
+            await database.Db.TeachingTasks
+                .Where(x => x.Id == first.Id || x.Id == second.Id)
+                .ToListAsync(),
+            task => Assert.Equal(TeachingTaskStatus.Published, task.Status));
+    }
+
+    private sealed class TestDatabase : IAsyncDisposable
+    {
+        private readonly SqliteConnection connection;
+        private readonly AcademicTerm term;
+        private readonly Course course;
+
+        private TestDatabase(
+            SqliteConnection connection,
+            AppDbContext db,
+            AcademicTerm term,
+            Course course)
+        {
+            this.connection = connection;
+            Db = db;
+            this.term = term;
+            this.course = course;
+            Controller = new TeachingTasksController(
+                db,
+                new TestDataScope());
+        }
+
+        public AppDbContext Db { get; }
+        public TeachingTasksController Controller { get; }
+
+        public static async Task<TestDatabase> CreateAsync()
+        {
+            var connection = new SqliteConnection("Data Source=:memory:");
+            await connection.OpenAsync();
+            var options = new DbContextOptionsBuilder<AppDbContext>()
+                .UseSqlite(connection)
+                .Options;
+            var db = new AppDbContext(options);
+            await db.Database.EnsureCreatedAsync();
+
+            var college = new College { Code = "TEST", Name = "测试学院" };
+            var term = new AcademicTerm
+            {
+                Code = "2026-1",
+                Name = "2026—2027 学年第一学期",
+                AcademicYear = "2026-2027",
+                Season = TermSeason.Autumn,
+                StartDate = new DateOnly(2026, 9, 1),
+                EndDate = new DateOnly(2027, 1, 15)
+            };
+            var course = new Course
+            {
+                Code = "TEST101",
+                Name = "测试课程",
+                CollegeId = college.Id,
+                Nature = CourseNature.MajorRequired,
+                TotalHours = 32,
+                LectureHours = 32
+            };
+            db.AddRange(college, term, course);
+            await db.SaveChangesAsync();
+            return new TestDatabase(connection, db, term, course);
+        }
+
+        public async Task<TeachingTask> AddTaskAsync(
+            string suffix,
+            TeachingTaskStatus status)
+        {
+            var task = new TeachingTask
+            {
+                TaskNumber = $"TASK-{suffix}",
+                Name = $"教学任务 {suffix}",
+                AcademicTermId = term.Id,
+                CourseId = course.Id,
+                Capacity = 40,
+                StartWeek = 1,
+                EndWeek = 16,
+                WeeklyHours = 2,
+                Status = status,
+                PublishedAt = status == TeachingTaskStatus.Draft
+                    ? null
+                    : DateTime.UtcNow
+            };
+            Db.TeachingTasks.Add(task);
+            await Db.SaveChangesAsync();
+            return task;
+        }
+
+        public async ValueTask DisposeAsync()
+        {
+            await Db.DisposeAsync();
+            await connection.DisposeAsync();
+        }
+    }
+
+    private sealed class TestDataScope : ICurrentUserDataScope
+    {
+        public CurrentUserScope Current { get; } = new(
+            Guid.NewGuid(),
+            "测试管理员",
+            null,
+            DataScope.All,
+            new HashSet<string>([SystemRoles.SuperAdmin]));
+    }
+}

web/src/views/TeachingTasksView.vue

@@ -56,7 +56,7 @@ const manualEligibleTeachers = ref<any[]>([])
 const statusLabels: Record<string, string> = {
   Draft: '草稿',
   Published: '已发布',
-  Closed: '已结课',
+  Closed: '已归档',
 }
 const courseNatureLabels: Record<string, string> = {
   GeneralRequired: '公共必修',
@@ -166,6 +166,9 @@ const selectedDraftRows = computed(() =>
 const selectedPublishedRows = computed(() =>
   selectedRows.value.filter((item) => item.status === 'Published'),
 )
+const selectedClosedRows = computed(() =>
+  selectedRows.value.filter((item) => item.status === 'Closed'),
+)
 const responsibilityText = computed(() => {
   if (isSuperAdmin.value) return '超级管理员可处理全部教学任务，并保留跨层级纠错权限。'
   if (isAcademicAdmin.value && isCollegeAdmin.value) {
@@ -242,7 +245,7 @@ function clearFilteredClasses(target: Record<string, any>, filtered: any[]) {
 }
 
 function rowSelectable(row: any) {
-  return canManageRow(row) && ['Draft', 'Published'].includes(row.status)
+  return canManageRow(row) && ['Draft', 'Published', 'Closed'].includes(row.status)
 }
 
 function onTaskSelectionChanged(selection: any[]) {
@@ -368,11 +371,21 @@ async function save() {
 }
 
 async function remove(row: any) {
+  const isArchived = row.status === 'Closed'
   try {
-    await ElMessageBox.confirm(`确定删除教学任务“${row.name}”吗？`, '删除草稿', {
-      type: 'warning',
-    })
+    await ElMessageBox.confirm(
+      isArchived
+        ? `将永久删除已归档教学任务“${row.name}”。如任务已被排课、选课、成绩或考试引用，系统会拒绝删除。确定继续吗？`
+        : `确定删除教学任务草稿“${row.name}”吗？`,
+      isArchived ? '删除已归档任务' : '删除草稿',
+      {
+        type: 'error',
+        confirmButtonText: '确认删除',
+        cancelButtonText: '取消',
+      },
+    )
     await http.delete(`/teaching-tasks/${row.id}`)
+    ElMessage.success(isArchived ? '已归档教学任务已删除' : '教学任务草稿已删除')
     await load()
   } catch (error: any) {
     if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
@@ -396,12 +409,32 @@ async function publish(row: any) {
 
 async function closeTask(row: any) {
   try {
-    await ElMessageBox.confirm('结课后将停止后续选课和排课调整，确定继续吗？', '教学任务结课', {
+    await ElMessageBox.confirm('归档后将停止后续选课和排课调整，确定继续吗？', '归档教学任务', {
       type: 'warning',
-      confirmButtonText: '确认结课',
+      confirmButtonText: '确认归档',
       cancelButtonText: '取消',
     })
     await http.post(`/teaching-tasks/${row.id}/close`)
+    ElMessage.success('教学任务已归档')
+    await load()
+  } catch (error: any) {
+    if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+async function unarchive(row: any) {
+  try {
+    await ElMessageBox.confirm(
+      '撤销归档后，教学任务将恢复为已发布状态，并重新进入相关业务流程。确定继续吗？',
+      '撤销教学任务归档',
+      {
+        type: 'warning',
+        confirmButtonText: '撤销归档',
+        cancelButtonText: '取消',
+      },
+    )
+    await http.post(`/teaching-tasks/${row.id}/unarchive`)
+    ElMessage.success('教学任务已撤销归档')
     await load()
   } catch (error: any) {
     if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
@@ -409,10 +442,12 @@ async function closeTask(row: any) {
 }
 
 async function batchAction(
-  operation: 'Publish' | 'Delete' | 'Archive',
+  operation: 'Publish' | 'Delete' | 'Archive' | 'Unarchive',
   targets: any[],
 ) {
   if (!targets.length) return
+  const deletingArchived = operation === 'Delete' &&
+    targets.every((item) => item.status === 'Closed')
   const descriptions = {
     Publish: {
       title: '批量发布教学任务',
@@ -422,10 +457,12 @@ async function batchAction(
       type: 'warning',
     },
     Delete: {
-      title: '批量删除教学任务',
-      message: `将永久删除选中的 ${targets.length} 个草稿，此操作不可撤销。确定继续吗？`,
+      title: deletingArchived ? '批量删除已归档任务' : '批量删除教学任务草稿',
+      message: deletingArchived
+        ? `将永久删除选中的 ${targets.length} 个已归档任务。已被后续业务引用的任务会拒绝删除，此操作不可撤销。确定继续吗？`
+        : `将永久删除选中的 ${targets.length} 个草稿，此操作不可撤销。确定继续吗？`,
       confirmButtonText: '批量删除',
-      success: '教学任务草稿已批量删除',
+      success: deletingArchived ? '已归档教学任务已批量删除' : '教学任务草稿已批量删除',
       type: 'error',
     },
     Archive: {
@@ -435,6 +472,13 @@ async function batchAction(
       success: '教学任务已批量归档',
       type: 'warning',
     },
+    Unarchive: {
+      title: '批量撤销教学任务归档',
+      message: `将选中的 ${targets.length} 个已归档任务恢复为已发布状态，并重新进入相关业务流程。确定继续吗？`,
+      confirmButtonText: '批量撤销归档',
+      success: '教学任务已批量撤销归档',
+      type: 'warning',
+    },
   } as const
   const description = descriptions[operation]
   try {
@@ -572,7 +616,7 @@ onMounted(async () => {
       <div v-if="selectedRows.length" class="batch-action-bar">
         <div>
           <b>已选择 {{ selectedRows.length }} 个教学任务</b>
-          <span>可操作：{{ selectedDraftRows.length }} 个草稿，{{ selectedPublishedRows.length }} 个已发布</span>
+          <span>可操作：{{ selectedDraftRows.length }} 个草稿，{{ selectedPublishedRows.length }} 个已发布，{{ selectedClosedRows.length }} 个已归档</span>
         </div>
         <div>
           <el-button
@@ -599,6 +643,22 @@ onMounted(async () => {
           >
             归档已发布（{{ selectedPublishedRows.length }}）
           </el-button>
+          <el-button
+            type="primary"
+            plain
+            :disabled="!selectedClosedRows.length"
+            @click="batchAction('Unarchive', selectedClosedRows)"
+          >
+            撤销归档（{{ selectedClosedRows.length }}）
+          </el-button>
+          <el-button
+            type="danger"
+            plain
+            :disabled="!selectedClosedRows.length"
+            @click="batchAction('Delete', selectedClosedRows)"
+          >
+            删除已归档（{{ selectedClosedRows.length }}）
+          </el-button>
         </div>
       </div>
 
@@ -625,14 +685,16 @@ onMounted(async () => {
         <el-table-column label="人数 / 容量" width="105"><template #default="{ row }">{{ row.studentCount }} / {{ row.capacity }}</template></el-table-column>
         <el-table-column label="周次" width="105"><template #default="{ row }">{{ row.startWeek }}—{{ row.endWeek }} 周</template></el-table-column>
         <el-table-column label="状态" width="90"><template #default="{ row }"><span class="table-status" :class="{ off: row.status === 'Closed' }">{{ statusLabels[row.status] }}</span></template></el-table-column>
-        <el-table-column label="操作" width="185" fixed="right">
+        <el-table-column label="操作" width="210" fixed="right">
           <template #default="{ row }">
             <el-button v-if="canManageRow(row) && row.status === 'Draft'" link type="primary" @click="openEdit(row)">编辑</el-button>
             <el-button v-if="canManageRow(row) && row.status === 'Draft'" link type="success" @click="publish(row)">发布</el-button>
             <el-button v-if="canManageRow(row) && row.status === 'Draft'" link type="danger" @click="remove(row)">删除</el-button>
-            <el-button v-if="canManageRow(row) && row.status === 'Published'" link type="warning" @click="closeTask(row)">结课</el-button>
+            <el-button v-if="canManageRow(row) && row.status === 'Published'" link type="warning" @click="closeTask(row)">归档</el-button>
+            <el-button v-if="canManageRow(row) && row.status === 'Closed'" link type="primary" @click="unarchive(row)">撤销归档</el-button>
+            <el-button v-if="canManageRow(row) && row.status === 'Closed'" link type="danger" @click="remove(row)">删除</el-button>
             <span v-if="!canManageRow(row) && row.status !== 'Closed'" class="muted-action">只读</span>
-            <span v-if="row.status === 'Closed'" class="muted-action">已结课归档</span>
+            <span v-if="!canManageRow(row) && row.status === 'Closed'" class="muted-action">已归档</span>
           </template>
         </el-table-column>
         <template #empty><el-empty description="没有符合条件的教学任务" /></template>