Merge branch 'develop5.0-tmd' of http://106.12.23.251:10000/TEAMMODEL/TEAMModelOS into develop5.0-tmd

TEAMModelOS/Controllers/Common/HomeworkController.cs

@@ -517,6 +517,8 @@ namespace TEAMModelOS.Controllers.Learn
                             }
                             List<HomeworkUser> users = new List<HomeworkUser>();
                             foreach (var typeuser in typeUsers) {
+                                var us= users.Find(x => x.userid.Equals(typeuser.userid));
+                                if (us != null) { continue; }
                                 HomeworkUser user = new HomeworkUser() { userid=typeuser.userid,userSchool=typeuser.userSchool,userType=typeuser.userType,username=typeuser.username,classes=typeuser.classes};
                                 string partition = $"HomeworkRecord-{typeuser.userid}";
                                 if (typeuser.userType.Equals("student"))