一个无刷新效果定时自动更新页面的例子(ASP.NET2.0-应用xmlhttp)

　　首先在ASP.Net创建两个WebForm页，分别命名为Default1，Default2。下面给出代码清单：

//Default1.aspx

<%@ Page Language="C#" Debug="true" AutoEventWireup="true" CodeFile="Default1.aspx.cs" Inherits="Default1" %>
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
http://www.w3.org/1999/xhtml" >

Ajax Dynamic Update Example

This page will automatically update itself:

Page will refresh in 1 seconds.

//Default2.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Default2: System.Web.UI.Page
{
private static int counter = 1;
protected void Page_Load(object sender, EventArgs e)
{
String res = "";
String task = this.Request.Params["task"];
String message = "";
if (!string.IsNullOrEmpty(task))
{
if (task.Equals("reset"))
{
counter = 1;
}
else
{
switch (counter)
{
case 1: message = "Steve walks on stage"; break;
case 2: message = "iPods rock"; break;
case 3: message = "Steve says Macs rule"; break;
case 4: message = "Change is coming"; break;
case 5: message = "Yes, OS X runs on Intel - has for years"; break;
case 6: message = "Macs will soon have Intel chips"; break;
case 7: message = "done"; break;
}
counter++;
}
res = "" + message + "";
Response.ContentType = "text/Xml";
Response.AppendHeader("Cache-Control", "no-cache");
Response.Write("");
Response.Write(res);
Response.Write("");
Response.End();
}
}
}

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