ASP.NET中IHttpHandler与IHttpModule的区别（带样例说明）

以你之姓@ 2023-05-21 08:50 1阅读 0赞

IHttpModule相对来说，是一个网页的添加  
IHttpHandler相对来说，却是网页的替换

先建一个HandlerDemo的类

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    
    namespace Http_Handler_Model
    { 
        public class HandlerDemo : IHttpHandler
        { 
         /* 这个IsReusable的true是可以提高效率但是，会线程不安全 IHttpHandler实例可以再次使用 false，会安全一些，效率会低一些 IHttpHandler的实例就不能使用 */
            public bool IsReusable => true;
    
            public void ProcessRequest(HttpContext context)
            { 
                context.Response.ContentType = "text/html";
                context.Response.Write("<h2>这是HandlerDemo做出来的</h2>");
            }
        }
    }

在建一个Module的类

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    
    namespace Http_Handler_Model
    { 
        public class Modules : IHttpModule
        { 
            public void Dispose()
            { 
            
            }
    
            public void Init(HttpApplication context)
            { 
            //添加一个开始的事件，和一个结束的事件
                context.BeginRequest += Context_BeginRequest;
                context.EndRequest += Context_EndRequest;
            }
    
            private void Context_EndRequest(object sender, EventArgs e)
            { 
                HttpApplication httpApplication = sender as HttpApplication;
                httpApplication.Response.Write("<h2>这是开始页面</h2>");
            }
    
            private void Context_BeginRequest(object sender, EventArgs e)
            { 
                HttpApplication httpApplication = sender as HttpApplication;
                httpApplication.Response.Write("<h2>这是结束页面</h2>");
            }
        }
    }

把这两个类建完了，就是添加到配置文件中  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDM5Nzc1NTIw_size_16_color_FFFFFF_t_70]  
打开你当前项目的这个配置文件  
添加这些  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDM5Nzc1NTIw_size_16_color_FFFFFF_t_70 1]  
这里面配置了handlers和modules

## `type的值是：命名空间.（点）你的类` ##

## `path的值是：你的作用域，我这里的作用域是某个文件夹下面的aspx` ##

<system.webServer>
        <handlers>
          <add name="handlers" path="Handler_Test/*.aspx" verb="*" type="Http_Handler_Model.HandlerDemo"/>
        </handlers>
        <modules>
          <add name="modules" type="Http_Handler_Model.Modules"/>
        </modules>
      </system.webServer>

**ModuleDemo的aspx**

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ModelsDemo.aspx.cs" Inherits="Http_Handler_Model.ModelsDemo" %>
    
    <!DOCTYPE html>
    
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
        <title></title>
    </head>
    <body>
        <form id="form1" runat="server">
            <div>
                这个是modules的样例
            </div>
        </form>
    </body>
    </html>

效果图  
这里添加了刚才的Modules类的操作  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDM5Nzc1NTIw_size_16_color_FFFFFF_t_70 2]

**某个文件夹下面的aspx**

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="HandlerDemo.aspx.cs" Inherits="Http_Handler_Model.Handler_Test.HandlerDemo" %>
    
    <!DOCTYPE html>
    
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
        <title></title>
    </head>
    <body>
        <form id="form1" runat="server">
            <div>
                这是Test被替换的页面
            </div>
        </form>
    </body>
    </html>

显示效果  
这里没有代码中的`这是Test被替换的页面`，而是HandlerDemo的操作  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDM5Nzc1NTIw_size_16_color_FFFFFF_t_70 3]

## `有不明白的欢迎评论` ##

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDM5Nzc1NTIw_size_16_color_FFFFFF_t_70]: /images/20230521/6310d995b8ed459586be178aaf5143cc.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDM5Nzc1NTIw_size_16_color_FFFFFF_t_70 1]: /images/20230521/317f40e7f9d44288be78940146156591.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDM5Nzc1NTIw_size_16_color_FFFFFF_t_70 2]: /images/20230521/0f27b07f154d4068979b23ae13e46c79.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDM5Nzc1NTIw_size_16_color_FFFFFF_t_70 3]: /images/20230521/5d1f1fea5dbd47aeb9c16294881becc9.png