DAL反填

 public stuclass UPDA(int id)
        {
            SqlParameter[] par = new SqlParameter[]
            {
             new SqlParameter ("StuID",id)
            };
            DataTable dt = DbHelperSQL.ExecuteDataTable(DAL.DbHelperSQL.ConnB2c, CommandType.StoredProcedure, "UP_FANTIAN", par);
            var d = JsonConvert.SerializeObject(dt);
            stuclass sc = JsonConvert.DeserializeObject<List<stuclass>>(d).FirstOrDefault();
            return sc;
        }