以前在asp很难实现代码重用,asp.net很好的解决了这个问题,以下是我写的DataGrid,继承DataGrid,加进了升降序/全并单元格/自动求和功能,原理很简单,但很好的实现的代码重用.
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
namespace SunService
{
    /// <summary>
    /// Summary description for DataGrid.
    /// </summary>
    [DefaultProperty("Text"),
    ToolboxData("<{0}:DataGrid runat=server></{0}:DataGrid>")]
    public class DataGrid : System.Web.UI.WebControls.DataGrid
    {
        private string text;
        private SqlDataAdapter adp;
        private DataSet ds;
        private DataView view;
        private string[] arritem;
        [Bindable(true),
        Category("Appearance"),
        DefaultValue("")]
        public string Text
        {
            get
            {
                return text;
            }

            set
            {
                text = value;
            }
        }
        /// <summary>
        /// protect SortDirection 排序方向
        /// </summary>

        public string SortDirection
        {
            get
            {
                if(ViewState["SortDirection"]==null)
                {
                    return null;
                }
                else
                {
                    if(ViewState["SortDirection"].ToString()=="")
                    {
                        return null;