存储过程的output参数


   public IList<Punishment> GetPunishmentPaging(int pageSize, int pageIndex, string Fields, string orderStr, int sortDescending, string where, out int recordCount)
        {
            recordCount = 0;
            DbCommand command = DB.GetStoredProcCommand("sp_Pagination2005");
            DB.AddInParameter(command, "@tblName", SqlDbType.NVarChar, "db_consult_punishment");
            DB.AddInParameter(command, "@fields", SqlDbType.NVarChar, Fields);
            DB.AddInParameter(command, "@sortField", SqlDbType.NVarChar, orderStr);
            DB.AddInParameter(command, "@pageSize", SqlDbType.Int, pageSize);
            DB.AddInParameter(command, "@pageIndex", SqlDbType.Int, pageIndex);
            DB.AddInParameter(command, "@sortDescending", SqlDbType.Bit, sortDescending);            DB.AddOutParameter(command, "@totalRecords", SqlDbType.Int, 4);
            DB.AddInParameter(command, "@strWhere", SqlDbType.NVarChar, where);            IList < Punishment > list= null;
            using (var reader = DB.ExecuteReader(command))
            {
               list = reader.ReaderToList<Punishment>();
            }
            recordCount = (int)DB.GetParameterValue(command, "@totalRecords");
            return list;
        }但换成这样   public IList<Punishment> GetPunishmentPaging(int pageSize, int pageIndex, string Fields, string orderStr, int sortDescending, string where, out int recordCount)
        {
            recordCount = 0;
            DbCommand command = DB.GetStoredProcCommand("sp_Pagination2005");
            DB.AddInParameter(command, "@tblName", SqlDbType.NVarChar, "db_consult_punishment");
            DB.AddInParameter(command, "@fields", SqlDbType.NVarChar, Fields);
            DB.AddInParameter(command, "@sortField", SqlDbType.NVarChar, orderStr);
            DB.AddInParameter(command, "@pageSize", SqlDbType.Int, pageSize);
            DB.AddInParameter(command, "@pageIndex", SqlDbType.Int, pageIndex);
            DB.AddInParameter(command, "@sortDescending", SqlDbType.Bit, sortDescending);            DB.AddOutParameter(command, "@totalRecords", SqlDbType.Int, 4);
            DB.AddInParameter(command, "@strWhere", SqlDbType.NVarChar, where);            using (var reader = DB.ExecuteReader(command))
            {
              recordCount = (int)DB.GetParameterValue(command, "@totalRecords");
              return reader.ReaderToList<Punishment>();
            }
        }会在recordCount = (int)DB.GetParameterValue(command, "@totalRecords");产生null不能转为int类型
为什么这么不能取到@totalRecords的值，而第一种却可以呢？
数据库是可以取到的。我用的是企业库