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/ExamArrangementServiceTests.cs

@@ -48,6 +48,7 @@ public sealed class ExamArrangementServiceTests
             .SingleAsync(x => x.Id == untouched.Id);
         Assert.True(result.Success);
         Assert.NotNull(persistedSelected.ClassroomId);
+        Assert.Equal(seed.LargeClassroom.Id, persistedSelected.ClassroomId);
         Assert.Null(persistedUntouched.ClassroomId);
         Assert.Single(persistedSelected.Invigilators);
         Assert.Empty(persistedUntouched.Invigilators);
@@ -159,6 +160,27 @@ public sealed class ExamArrangementServiceTests
             BuildingId = building.Id,
             Capacity = 80
         };
+        var smallClassroom = new Classroom
+        {
+            Code = $"R-SMALL-{suffix}",
+            Name = "102",
+            BuildingId = building.Id,
+            Capacity = 1
+        };
+        var major = new Major
+        {
+            Code = $"MAJOR-{suffix}",
+            Name = "计算机科学与技术",
+            CollegeId = college.Id,
+            DegreeType = "工学学士"
+        };
+        var administrativeClass = new AdministrativeClass
+        {
+            Code = $"CLASS-{suffix}",
+            Name = "计科 2026-1 班",
+            MajorId = major.Id,
+            Grade = 2026
+        };
         var firstCourse = new Course
         {
             Code = $"COURSE-1-{suffix}",
@@ -177,7 +199,14 @@ public sealed class ExamArrangementServiceTests
             Name = "程序设计教学班",
             AcademicTermId = term.Id,
             CourseId = firstCourse.Id,
-            Status = TeachingTaskStatus.Published
+            Status = TeachingTaskStatus.Published,
+            Classes =
+            [
+                new TeachingTaskClass
+                {
+                    AdministrativeClassId = administrativeClass.Id
+                }
+            ]
         };
         var secondTask = new TeachingTask
         {
@@ -201,6 +230,25 @@ public sealed class ExamArrangementServiceTests
             college,
             building,
             classroom,
+            smallClassroom,
+            major,
+            administrativeClass,
+            new Student
+            {
+                StudentNumber = $"STUDENT-1-{suffix}",
+                Name = "学生甲",
+                AdministrativeClassId = administrativeClass.Id,
+                EnrollmentYear = 2026,
+                EnrollmentDate = new DateOnly(2026, 9, 1)
+            },
+            new Student
+            {
+                StudentNumber = $"STUDENT-2-{suffix}",
+                Name = "学生乙",
+                AdministrativeClassId = administrativeClass.Id,
+                EnrollmentYear = 2026,
+                EnrollmentDate = new DateOnly(2026, 9, 1)
+            },
             firstCourse,
             secondCourse,
             firstTask,
@@ -223,11 +271,12 @@ public sealed class ExamArrangementServiceTests
                 EndsAt = new TimeOnly(9, 50)
             });
         await db.SaveChangesAsync();
-        return new SeedData(term, firstTask, secondTask);
+        return new SeedData(term, firstTask, secondTask, classroom);
     }
 
     private sealed record SeedData(
         AcademicTerm Term,
         TeachingTask FirstTask,
-        TeachingTask SecondTask);
+        TeachingTask SecondTask,
+        Classroom LargeClassroom);
 }

tests/Jiaowu.Api.Tests/ExamSignInWorkbookExporterTests.cs

@@ -0,0 +1,60 @@
+using ClosedXML.Excel;
+using Jiaowu.Api.Infrastructure.Exams;
+
+namespace Jiaowu.Api.Tests;
+
+public sealed class ExamSignInWorkbookExporterTests
+{
+    [Fact]
+    public void Create_builds_summary_and_printable_session_sheets()
+    {
+        var sessionId = Guid.NewGuid();
+        var session = new ExamSignInSessionData(
+            sessionId,
+            new DateOnly(2027, 1, 8),
+            new DateTime(2027, 1, 8, 8, 0, 0, DateTimeKind.Utc),
+            new DateTime(2027, 1, 8, 9, 50, 0, DateTimeKind.Utc),
+            "CS101",
+            "程序设计基础",
+            "2026-1-CS101-01",
+            "第一教学楼",
+            "101",
+            ["张老师", "李老师"],
+            [
+                new ExamSignInStudentData(
+                    Guid.NewGuid(),
+                    "202601001",
+                    "周同学",
+                    "计科 2026-1 班")
+            ]);
+        var data = new ExamSignInWorkbookData(
+            "2026—2027 学年第一学期期末考试",
+            "2026—2027 学年第一学期",
+            [
+                session,
+                session with { SessionId = Guid.NewGuid() }
+            ]);
+
+        var bytes = ExamSignInWorkbookExporter.Create(data);
+
+        using var stream = new MemoryStream(bytes);
+        using var workbook = new XLWorkbook(stream);
+        Assert.Equal(3, workbook.Worksheets.Count);
+        Assert.Equal("考场汇总", workbook.Worksheet(1).Name);
+        Assert.Equal(1, workbook.Worksheet("考场汇总").Cell("F5").GetDouble());
+        Assert.Equal(1, workbook.Worksheet("考场汇总").Cell("F6").GetDouble());
+        Assert.Equal(
+            workbook.Worksheets.Count,
+            workbook.Worksheets.Select(x => x.Name)
+                .Distinct(StringComparer.OrdinalIgnoreCase)
+                .Count());
+
+        var signInSheet = workbook.Worksheet(2);
+        Assert.Equal("考试考场签名单", signInSheet.Cell("A1").GetString());
+        Assert.Contains("第一教学楼", signInSheet.Cell("E4").GetString());
+        Assert.Equal("202601001", signInSheet.Cell("C8").GetString());
+        Assert.Equal("周同学", signInSheet.Cell("D8").GetString());
+        Assert.Equal(XLPageOrientation.Portrait, signInSheet.PageSetup.PageOrientation);
+        Assert.Equal(XLPaperSize.A4Paper, signInSheet.PageSetup.PaperSize);
+    }
+}

tests/Jiaowu.Api.Tests/MySqlMigrationTests.cs

@@ -119,15 +119,28 @@ public sealed class MySqlMigrationTests
     public void MySql_teaching_task_roster_query_is_translatable()
     {
         using var db = new AppDbContext(CreateMySqlOptions());
+        var studentId =
+            Guid.Parse("22222222-2222-2222-2222-222222222222");
 
         var sql = TeachingTaskRosterQuery
             .ForTask(
                 db,
                 Guid.Parse("11111111-1111-1111-1111-111111111111"))
             .ToQueryString();
+        var taskIdsSql = TeachingTaskRosterQuery
+            .TaskIdsForStudent(db, studentId)
+            .ToQueryString();
 
         Assert.Contains("TeachingTaskClasses", sql, StringComparison.OrdinalIgnoreCase);
         Assert.Contains("CourseEnrollments", sql, StringComparison.OrdinalIgnoreCase);
+        Assert.Contains(
+            "TeachingTaskClasses",
+            taskIdsSql,
+            StringComparison.OrdinalIgnoreCase);
+        Assert.Contains(
+            "CourseEnrollments",
+            taskIdsSql,
+            StringComparison.OrdinalIgnoreCase);
     }
 
     [Fact]