<httpModules>

        <</span>add name="html" type="HttpModule"/>

</httpModules>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

///URL重写  的摘要说明

///1.创建类文件 HttpModule.cs

///2.实现IHttpModule接口的方法

public class HttpModule : IHttpModule

{

        //清理资源

        public HttpModule(){}

        public void Dispose(){}

        ///

        /// 初始化

        ///

        ///

        public void Init(HttpApplication context)

        {

            //3.在初始化方法中添加事件处理方法

            context.BeginRequest += new EventHandler(BeginRequest);

            context.EndRequest += new EventHandler(EndRequest);

        }

        //4. 编写开始处理请求代码

        public void BeginRequest(object sender, EventArgs e)

        {

            HttpApplication app = sender as HttpApplication;

            //app.Response.Write("开始处理请求！");

            //4.1 截获请求网址

            string url = app.Request.RawUrl;

            //4.2 判断网址是否符合要求，判断是否进行重发到指定页面

            if (url.LastIndexOf(".html") > )

            {

                //转发到指定页面

                app.Server.Transfer("~/HttpMoudle/UrlReWrite.aspx");

            }

        }

        public void EndRequest(object sender, EventArgs e)

        {

            HttpApplication app = sender as HttpApplication;

            //app.Response.Write("结束处理请求！");

        }

    }