自定义

RMYY_CallCenter_Api/Controllers/CustomFiledController.cs

             var modellist = new Bll.T_Sys_CustomFiled().GetModelList("F_CreateUser='" + User.F_UserCode + "' and F_TableId='" + TableId + "'");
             if (modellist != null && modellist.Count > 0)
             {
+              
                 var obj = new
                 {
                     F_Id = modellist.FirstOrDefault().F_Id ,
                     F_TableId =  modellist.FirstOrDefault().F_TableId,
-                    F_Fileds = modellist.FirstOrDefault().F_Fileds .Split (','),
+                    F_Fileds = string.IsNullOrEmpty(modellist.FirstOrDefault().F_Fileds)?null:modellist.FirstOrDefault().F_Fileds.Split (','),
                     F_CreateUser = modellist.FirstOrDefault().F_CreateUser ,
                     F_CreateTime = modellist.FirstOrDefault().F_CreateTime ,
                     F_FiledNames = modellist.FirstOrDefault().F_FiledNames ,