update

TEAMModelOS.Function/CosmosDBTriggers/TriggerExam.cs

@@ -201,7 +201,7 @@ namespace TEAMModelOS.CosmosDBTriggers
                                         foreach (ExamSubject subject in info.subjects)
                                         {
                                             string classCode = string.Empty;
-                                            string cname = string.Empty;
+                                            string? cname = string.Empty;
                                             if (string.IsNullOrEmpty(info.school) || !info.scope.Equals("school", StringComparison.OrdinalIgnoreCase))
                                             {
                                                 classCode = "ExamClassResult-" + info.creatorId;