這裡介紹Ihttpmodule處理請求管道的方法。Response.Redirect的原理是服務器設置返回http狀態碼為302,然後客戶端執行跳轉，用reflector可以看到.Net的代碼段。
以下是HttpResponse類的Redirect方法中的跳轉代碼
this.StatusCode = 0x12e; this.RedirectLocation = url;
所以，我們可以擴展Ihttpmodule來攔截http狀態碼，強制設為200，同時插入JS代碼段來實現新窗口打開。以下是Ihttpmodule的實現代碼
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() ...{ } }
}
最後配置一下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>
另外一點，ms自坐主張的在跳轉之後，end之前插入了這麼一段代碼，我得b4他們一下，解決辦法，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> ");
