/// <summary>
    /// 返回DataReader对象
    /// </summary>
    /// <param name="query"></param>
    /// <returns></returns>
    public static IDataReader ExecuteReader(string query)
    {
        using (LogParserConnection conn = new LogParserConnection())
        {
            conn.Open();
            using (LogParserCommand cmd = new LogParserCommand(query, conn))
            {
                return cmd.ExecuteReader();
            }
        }
    }
    /// <summary>
    /// 返回DataSet数据集
    /// </summary>
    /// <param name="query"></param>
    /// <returns></returns>
    public static DataSet ExecuteDataSet(string query)
    {
        using (LogParserConnection conn = new LogParserConnection())
        {
            conn.Open();
            using (LogParserCommand cmd = new LogParserCommand(query, conn))
            {
                using (LogParserDataAdapter ad = new LogParserDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    ad.Fill(ds);
                    if (ds.Tables.Count > 0)
                        return ds;
                    else
                        return null;
                }
            }
        }
    }
}

        using (IDataReader dr = LogParserHelper.ExecuteReader(@"select top 10 c-ip, count(c-ip) as ip_count from F:\iislog\u_ex120606.log GROUP BY c-ip order by ip_count desc"))
        {
            while (dr.Read())
            {
                Console.WriteLine(dr["c-ip"] + "\t" + dr["ip_count"]);
            }

        }
    }