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”。

web/src/views/ExamsView.vue

@@ -1,7 +1,8 @@
 <script setup lang="ts">
 import { computed, onMounted, reactive, ref } from 'vue'
-import { Plus, Promotion, Refresh, UserFilled, Setting } from '@element-plus/icons-vue'
+import { Download, Plus, Promotion, Refresh, UserFilled, Setting } from '@element-plus/icons-vue'
 import http, { apiErrorMessage } from '../api/http'
+import { downloadApiFile } from '../api/excel'
 import { useAuthStore } from '../stores/auth'
 import { academicTermLabel, academicTermOptionClass, defaultAcademicTermId } from '../utils/academicTerms'
 
@@ -20,6 +21,7 @@ const buildings = ref<any[]>([])
 const timeSlots = ref<any[]>([])
 const loading = ref(false)
 const arrangeLoading = ref(false)
+const exportLoading = ref(false)
 const planDialog = ref(false)
 const sessionDialog = ref(false)
 const editingSession = ref<any | null>(null)
@@ -250,6 +252,21 @@ async function publishPlan() {
     if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
   }
 }
+async function exportSignInSheets() {
+  if (!selected.value) return
+  exportLoading.value = true
+  try {
+    await downloadApiFile(
+      `/exams/plans/${selected.value.id}/sign-in-sheets.xlsx`,
+      `考场签名单-${selected.value.name}.xlsx`,
+    )
+    ElMessage.success('考场签名单已导出')
+  } catch (error) {
+    ElMessage.error(apiErrorMessage(error))
+  } finally {
+    exportLoading.value = false
+  }
+}
 async function showRoster(row: any) {
   try {
     roster.value = (await http.get(`/exams/sessions/${row.id}/roster`)).data
@@ -317,6 +334,12 @@ onMounted(async () => {
             <p>{{ selected.termName }} · {{ selected.sessions.length }} 个考试场次</p>
           </div>
           <div class="exam-actions">
+            <el-button
+              :icon="Download"
+              :loading="exportLoading"
+              :disabled="selected.sessions.length === 0"
+              @click="exportSignInSheets"
+            >导出考场签名单</el-button>
             <el-button v-if="selected.status === 'Draft'" @click="autoArrange('rooms')" :loading="arrangeLoading">一键分配考场</el-button>
             <el-button v-if="selected.status === 'Draft'" @click="autoArrange('invigilators')" :loading="arrangeLoading">一键分配监考</el-button>
             <el-button v-if="selected.status === 'Draft'" :icon="Setting" @click="autoArrange('all')" :loading="arrangeLoading">一键完成</el-button>