自定义 httpmodel

https://msdn.microsoft.com/en-us/library/aa719858(v=vs.71).aspx

http://www.cnblogs.com/jimmyzhang/archive/2007/11/25/971878.html

web.config

<configuration>
  <system.webServer>
    <modules>
      <remove name="FormsAuthentication" />
        <add name="MyRedirect"   type="MyRedirect.MyRedirect, MyRedirect" />
    </modules>
    </system.webServer>
</configuration>

创建类库 编译该类   把生成的DLL直接放到bin  然后修改config   OK

using System;
using System.Collections;
using System.Web;

namespace MyRedirect
{
    public class MyRedirect : IHttpModule
    {
        public String ModuleName
        {
            get { return "MyRedirect"; }
        }

        // In the Init function, register for HttpApplication
        // events by adding your handlers.
        public void Init(HttpApplication application)
        {
            application.BeginRequest += (new EventHandler(this.Application_BeginRequest));
        }

        // Your BeginRequest event handler.
        private void Application_BeginRequest(Object source, EventArgs e)
        {

            HttpApplication application = (HttpApplication)source;
            HttpContext context = application.Context;
            //context.Response.Redirect("http://www.baidu.com");
            //context.Response.Write("<h1><font color=red>test</font></h1><hr>");
            string accessUrl = System.Configuration.ConfigurationManager.AppSettings["AccessUrl"];
            string redirectUrl = System.Configuration.ConfigurationManager.AppSettings["RedirectUrl"];
            //context.Response.Write("<h1><font color=red>"+ accessUrl + "</font></h1><hr>");
            //context.Response.Write("<h1><font color=red>"+ redirectUrl + "</font></h1><hr>");
            if (context.Request.Url.Host == accessUrl)
            {

                context.Response.Redirect(redirectUrl);
            }

        }

        public void Dispose()
        {
        }
    }
}

相关问题：

http://www.cnblogs.com/xiaoshi657/p/6515492.html