public ActionResult GetSelectJson(string keyValue)
        {
            var       data = userApp.GetClassUserList(keyValue);
            DataTable list = new DataTable();

            list.Columns.Add("FId", Type.GetType("System.String"));
            list.Columns.Add("FRealName", Type.GetType("System.String"));
            foreach (UserEntity item in data)
            {
                list.Rows.Add(new object[] { item.FId, item.FRealName });
            }
            return(Content(list.ToJson()));
        }