How to used HttpModule

最新推荐文章于 2025-08-06 20:42:55 发布

wangyuelin_1982

最新推荐文章于 2025-08-06 20:42:55 发布

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分类专栏： asp.net 文章标签： httpmodule interface authorization asp.net authentication processing

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本文介绍如何使用 HttpModules 扩展 ASP.NET 的处理流程，包括实现 IHttpModule 接口的方法，并提供了一个简单的实例，展示了如何在每个请求开始时输出问候消息。

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Http Modules allow you to extend the existing ASP.NET pipeline. The most common use of HTTPModules is pre and/ore postprecessing of requests. Internally ASP.NET utilizes custom modules (httpmodules) for: output caching, authentication and authorization etc. Therefore, if you ever need to tap into the pipleline to alter the request in any way, look into HttpModules as they provide a relatively easy way for you to do just that (similiar to how ISAPI filters helped achieve pre/post processing capabilities).

To develop an HttpModule you are required to do the following:

You class must implement the iHttpModule Interface
Both the Init(..) and Dispose() methods must be in your class definitions

Below is a simple example that outputs "HttpModule says Hello!" to each and every request. You will notice that I wired an event in the Init(..) method that calls OnBeginRequest at the beginning of every request.


            using System;
using System.Web;
namespace CSharpFriends.Samples
{
 public class CSharpFriendsHttpModule : IHttpModule 
 {
  public CSharpFriendsHttpModule()
  {
              }
  /// 
  /// Required by the interface IHttpModule
  /// 
  public void Dispose() 
  {	
  }
  /// 
  /// Required by the interface IHttpModule
  /// I also wire up the Begin Request event.
  /// 
  public void Init(System.Web.HttpApplication App) 
  {  
                 App.BeginRequest += new System.EventHandler(OnBeginRequest);
                 App.EndRequest+=new System.Eventhandler(OnEndRequest);
              }

   public void OnBeginRequest(object sender, EventArgs e)

   {

    //HttpRequest request = ((HttpApplication)sender).Request;

    HttpApplication app= ((HttpApplication)sender;

    app.Context.Response.Write("HttpModule says Hello!");

   }

   public void OnEndRequest(object sender,EventArgs e)

{

    HttpApplication app=(HttpApplication)sender;

    app.Context.Response.Write("HttpModule says Baby!");

}

}

In your web.config, add the following elements:

<httpModules>

	<add type="CSharpFriends.Samples.CSharpFriendsHttpModule,Test" name="CSharpFriendsHttpModule" /></httpModules>