Winform中GridView分组排序功能实现方法

        /// <summary>
        /// 根据sql语句 和 参数数组获取单个值
        /// </summary>
        /// <param name="strSQL"></param>
        /// <param name="paras"></param>
        /// <returns></returns>
        public static object GetObject(string strSQL, SqlParameter[] paras)
        {
            return GetObject(strSQL, paras, CommandType.Text);
        }
        /// <summary>
        /// 执行SQL语句，返回首行首列
        /// </summary>
        /// <param name="strSQL">要执行的SQL语句</param>
        /// <param name="paras">参数列表，没有参数填入null</param>
        /// <returns>返回的首行首列</returns>
        public static object GetObject(string strSQL, SqlParameter[] paras, CommandType cmdtype)
        {
            object o = null;
            using (SqlConnection conn = new SqlConnection(strConn))
            {
                SqlCommand cmd = new SqlCommand(strSQL, conn);
                cmd.CommandType = cmdtype;
                if (paras != null)
                {
                    cmd.Parameters.AddRange(paras);
                }
                conn.Open();
                o = cmd.ExecuteScalar();
                conn.Close();