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这里介绍Ihttpmodule处理请求管道的方法。Response.Redirect的原理是服务器设置返回http状态码为302,然后客户端执行跳转，用reflector可以看到.net的代码段。
以下是HttpResponse类的Redirect方法中的跳转代码
 this.StatusCode = 0x12e;
this.RedirectLocation = url;
所以，我们可以扩展Ihttpmodule来拦截http状态码，强制设为200，同时插入js代码段来实现新窗口打开。以下是Ihttpmodule的实现代码
using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
namespace ClassLibrary2
  ...{
 public class Class1:System.Web.IHttpModule
  ...{
public void Init(HttpApplication application)
...{
application.PreSendRequestHeaders += new EventHandler(application_PreSendRequestHeaders);
 }
void application_PreSendRequestHeaders(object sender, EventArgs e)
...{
HttpApplication Application = (HttpApplication)sender;
HttpContext context = Application.Context;
if (context.Response.StatusCode == 302)
...{
context.Response.Write("<script>window.open('"+context.Response.RedirectLocation+"')</script>");
context.Response.StatusCode = 200;
}
}
public void Dispose()
...{
}
}
 }
最后配置一下web.config就可以了
<?xml version="1.0"?>
<configuration>
<system.web>
<compilation debug="true"/>
<authentication mode="Windows"/>
<httpModules>
<add name="MyModule" type="ClassLibrary2.Class1,ClassLibrary2"></add>
</httpModules>
</system.web>
</configuration>
另外一点，ms自坐主张的在跳转之后，end之前插入了这么一段代码，我得b4他们一下，解决办法，大家自己想想吧。
this.Write("<html><head><title>Object moved</title></head><body> ");
this.Write("<h2>Object moved to <a href="" + HttpUtility.HtmlAttributeEncode(url) + "">here</a>.</h2> ");
this.Write("</body></html> ");
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