DbInstance dins = new DbInstance();
            dins.CommandText = strSql.ToString();
            dins.Open();
            DataTable dt = dins.ExecuteTable(); 

           dins.Close();
            if (dt != null && dt.Rows.Count > 0)
            {
                return dt.Rows[0];
            }

            return null;

　　ExecuteTable方法

            IDataReader reader = null;

            try
            {
                reader = iCmd.ExecuteReader();
            }
            catch (Exception e)
            {
                this.Close(iCmd);
                LogWriter.WriteErrLog(e.Message);
                return null;
            }

            DataTable dt = new DataTable();
            int fieldCount = reader.FieldCount;
            for (int i = 0; i < fieldCount; i++)
                dt.Columns.Add(reader.GetName(i), reader.GetFieldType(i));

            while (reader.Read())
            {
                DataRow dr = dt.NewRow();
                for (int i = 0; i < fieldCount; i++)
                    dr[i] = reader[i];
                dt.Rows.Add(dr);
            }

            reader.Close();
            reader.Dispose();

            return dt;

断点执行的时候读取不到数据，另外刷新操作的话，页面上还有2次数据操作，但仔细看了，用的是一个封装数据库类，连接也正常关闭了。。。