动态创建DataGrid 列排序功能的实现

动态创建的控件在回调的时候,将会被清空,所以事件更不能被执行,解决的方法是在LOAD事件里从新加载一次

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace WebApplication1
{
    /**//// <summary>
    /// Summary description for WebForm1.
    /// </summary>
    public class WebForm1 : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Button Button1;
        protected System.Web.UI.WebControls.DataGrid DataGrid1;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // Put user code to initialize the page here

            //            string f = @"\\10.1.22.77\test";
            //
            //            foreach (string s in System.IO.Directory.GetFiles(f))
            //            {
            //                Response.Write(s);
            //                Response.Write("<br>");
            //            }

            if(Page.IsPostBack)
                CreateDataGrid();
        }

        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {    
            this.DataGrid1.SelectedIndexChanged += new System.EventHandler(this.DataGrid1_SelectedIndexChanged);
            this.Button1.Click += new System.EventHandler(this.Button1_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void DataGrid1_SelectedIndexChanged(object sender, System.EventArgs e)
        {
        
        }

        private void Button1_Click(object sender, System.EventArgs e)
        {
            
            CreateDataGrid();

        }
        protected string SortOrder 
        {
            get 
            {
                if(ViewState["DataGrid1SortOrder"] == null) 
                {
                    ViewState["DataGrid1SortOrder"] = "ASC";
                }
                return (string) ViewState["DataGrid1SortOrder"];
            }
            set { ViewState["DataGrid1SortOrder"] = value; }
        }
        private void DataGrid1_SortCommand(object source, DataGridSortCommandEventArgs e)
        {
            DataTable dt=(( (DataGrid)source).DataSource) as DataTable ;
            string SortField;
            if(SortOrder == "ASC") 
            {
                SortField = e.SortExpression + " DESC";
                SortOrder =  "DESC";
            }
            else 
            {
                SortField = e.SortExpression + " ASC";
                SortOrder =  "ASC";
            }
            dt.DefaultView.Sort=SortField;
            DataGrid1.DataSource=dt;
            DataGrid1.DataBind();
        }

        private void CreateDataGrid()
        {
            DataTable dt=new DataTable ();
            dt.Columns.Add("ID");
            dt.Columns.Add("Name");
            for(int i=0;i<10;i++)
            {
                DataRow dr=dt.NewRow();
                dr[0]=i;
                dr[1]="Name"+i;
                dt.Rows.Add(dr);
            }
                     
            BoundColumn dcID=new BoundColumn();
            dcID.HeaderText="ID";
            dcID.DataField="ID";
            dcID.SortExpression="ID";
            dcID.Visible=true;

        
            if(this.DataGrid1.Columns.Count<2)            
            this.DataGrid1.Columns.Add(dcID);            

            DataGrid1.DataSource=dt;
            DataGrid1.DataBind();

            DataGrid1.SortCommand+=new DataGridSortCommandEventHandler(DataGrid1_SortCommand);}
    }
}

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="WebApplication1.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>WebForm1</title>
        <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
        <meta name="CODE_LANGUAGE" Content="C#">
        <meta name="vs_defaultClientScript" content="JavaScript">
        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
    </HEAD>
    <body MS_POSITIONING="GridLayout">
        <form id="Form1" method="post" runat="server">
            <asp:DataGrid id="DataGrid1" style="Z-INDEX: 101; LEFT: 232px; POSITION: absolute; TOP: 112px"
                runat="server" AutoGenerateColumns="False" AllowSorting="True">
                <Columns>
                    <asp:BoundColumn DataField="Name" SortExpression="Name" HeaderText="Name "></asp:BoundColumn>
                </Columns>
            </asp:DataGrid>
            <asp:Button id="Button1" style="Z-INDEX: 102; LEFT: 496px; POSITION: absolute; TOP: 128px" runat="server"
                Text="Button"></asp:Button>
        </form>
    </body>
</HTML>