处理null的值

TEAMModelOS.SDK/Models/Cosmos/School/Class.cs

@@ -23,8 +23,8 @@ namespace TEAMModelOS.SDK.Models
         /// </summary>
         public string no { get; set; }
 
-        public float x { get; set; }
-        public float y { get; set; }
+        public float? x { get; set; }
+        public float? y { get; set; }
         public string name { get; set; }
         public Teachers teacher { get; set; }
         public string periodId { get; set; }
@@ -46,7 +46,7 @@ namespace TEAMModelOS.SDK.Models
         /// <summary>
         /// 学生名单数据来源 1是不同学校的学生账号，2是扫码加入的醍摩豆ID
         /// </summary>
-        public int source { get; set; }
+        public int? source { get; set; }
         
     }
 }