protected ResultObj <T> Content <T>(T obj, ResultCode retCode, string retMsg, Pagination pagination)
 {
     if (String.IsNullOrEmpty(retMsg))
     {
         switch (retCode)
         {
         case ResultCode.Success:
             retMsg = "操作成功!";
             break;
         }
     }
     return(ResultObj <T> .GetResult(obj, retCode, retMsg, pagination));
 }