using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 namespace ThreeLayerWebDemo._2019_7_14_Event

 {

     public class MyHttpModule : IHttpModule

     {

         public void Dispose()

         {

         }

         public void Init(HttpApplication context)

         {

             //注册第一个HttpApplication第一个事件

             context.BeginRequest += Context_BeginRequest;

         }

         private void Context_BeginRequest(object sender, EventArgs e)

         {

             var app = sender as HttpApplication;

             app.Response.Write("这是来自HttpModuel的代码<br/>");

         }

     }

 }

   <system.web>

     <httpModules>

       <add name="DemoModule" type="ThreeLayerWebDemo._2019_7_14_Event.MyHttpModule"/>

     </httpModules>

   </system.web>

   <system.webServer>

     <modules>

       <add name="DemoModule" type="ThreeLayerWebDemo._2019_7_14_Event.MyHttpModule"/>

     </modules>

   </system.webServer>