Http请求处理流程管道流程 MVC扩展HttpModule

HttpApplication 封装了管道处理请求的所有事件

HttpModule　　对HttpApplication中事件的扩展

HttpHandler 　处理程序每个请求都要经过Handler处理

HttpContext 　　容器保存了请求的所有信息

请求进来先直接内置的所有管道事件也就是所有的HttpModule 然后执行HttpHandler 这个就是自己对请求进行的操作自己写的代码

　　HttpHandler和HttpModule都可以处理http请求 HttpModule的作用类似AOP，是针对某些通用功能（请求拦截、身份认证、检查功能）的，而HttpHandler常用来处理某一类（ashx、aspx、asmx）http请求

EntityFramework 版本

扩展HttpModule

HttpModule是每个请求都会执行到的

1.创建一个类继承IHttpModule 扩展HttpModuleModule

    public class MyCustomModule : IHttpModule
    {
        /// <summary>
        /// 您将需要在网站的 Web.config 文件中配置此模块
        /// 并向 IIS 注册它，然后才能使用它。有关详细信息，
        /// 请参见下面的链接: http://go.microsoft.com/?linkid=8101007
        /// </summary>
        #region IHttpModule Members

        public void Dispose()
        {
            //此处放置清除代码。
        }

        public void Init(HttpApplication application)
        {
            application.AcquireRequestState += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "AcquireRequestState        "));
            application.AuthenticateRequest += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "AuthenticateRequest        "));
            application.AuthorizeRequest += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "AuthorizeRequest           "));
            application.BeginRequest += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "BeginRequest               "));
            application.Disposed += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "Disposed                   "));
            application.EndRequest += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "EndRequest                 "));
            application.Error += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "Error                      "));
            application.LogRequest += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "LogRequest                 "));
            application.MapRequestHandler += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "MapRequestHandler          "));
            application.PostAcquireRequestState += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PostAcquireRequestState    "));
            application.PostAuthenticateRequest += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PostAuthenticateRequest    "));
            application.PostAuthorizeRequest += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PostAuthorizeRequest       "));
            application.PostLogRequest += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PostLogRequest             "));
            application.PostMapRequestHandler += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PostMapRequestHandler      "));
            application.PostReleaseRequestState += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PostReleaseRequestState    "));
            application.PostRequestHandlerExecute += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PostRequestHandlerExecute  "));
            application.PostResolveRequestCache += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PostResolveRequestCache    "));
            application.PostUpdateRequestCache += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PostUpdateRequestCache     "));
            application.PreRequestHandlerExecute += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PreRequestHandlerExecute   "));
            application.PreSendRequestContent += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PreSendRequestContent      "));
            application.PreSendRequestHeaders += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "PreSendRequestHeaders      "));
            application.ReleaseRequestState += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "ReleaseRequestState        "));
            application.RequestCompleted += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "RequestCompleted           "));
            application.ResolveRequestCache += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "ResolveRequestCache        "));
            application.UpdateRequestCache += (s, e) => application.Response.Write(string.Format("<h1 style='color:#00f'>来自MyCustomModule 的处理，{0}请求到达 {1}</h1><hr>", DateTime.Now.ToString(), "UpdateRequestCache         "));


            //context.AuthenticateRequest    //验证请求，一般用来取得请求用户的信息
            //context.PostAuthenticateRequest    已经获取请求用户的信息
            //context.AuthorizeRequest    授权，一般用来检查用户的请求是否获得权限
            //context.PostAuthorizeRequest    用户请求已经得到授权
            //context.ResolveRequestCache    获取以前处理缓存的处理结果，如果以前缓存过，那么，不必再进行请求的处理工作，直接返回缓存结果
            //context.PostResolveRequestCache    已经完成缓存的获取操作
            //context.PostMapRequestHandler    已经根据用户的请求，创建了处理请求的处理器对象
            //context.AcquireRequestState    取得请求的状态，一般用于Session
            //context.PostAcquireRequestState    已经取得了Session
            //context.PreRequestHandlerExecute    准备执行处理程序
            //context.PostRequestHandlerExecute    已经执行了处理程序
            //context.ReleaseRequestState    释放请求的状态
            //context.PostReleaseRequestState    已经释放了请求的状态
            //context.UpdateRequestCache    更新缓存
            //context.PostUpdateRequestCache    已经更新了缓存
            //context.LogRequest    请求的日志操作
            //context.PostLogRequest    已经完成了请求的日志操作

        }

        #endregion
    }

我们自己的Controller中写的Action就是在PreRequestHandlerExecute事件跟PostRequestHandlerExecute时间之间执行

　　　　Pre刚到这个事件 Post当前事件执行完毕

　　　　在这里会通过MvcRouteHandler找到一个执行当前请求的Handler 源码中在System.Web.MVC找MvcRouteHandler

2.写入配置文件Web.config

在system.webServer 标签中的Modules里

    <modules runAllManagedModulesForAllRequests="true">
      <add name="MyCustomerModule" type="命名空间+类名,程序集名"/>
    </modules>

3.框架默认有一套HttpModule 如果知道不需要其中某些HttpModule 移除指定的HttpModule

    <modules runAllManagedModulesForAllRequests="false">
      <remove name="FormsAuthentication" />
      <remove name="WindowsAuthentication" />
      <remove name="PassportAuthentication" />
      <remove name="RoleManager" />
      <remove name="FileAuthorization" />
      <remove name="UrlAuthorization" />
    </modules>

***************

之前版本的Asp.Net MVC正是通过 UrlRoutingModule.cs 类和 MvcHandler.cs 类进行扩展从而实现了MVC框架。

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而在Asp.Net Core里面，管道模型流程发生了很大的变化：

IHttpModule和IHttpHandler不复存在，取而代之的是一个个中间件(Middleware)。

Http请求处理流程管道流程 MVC扩展HttpModule

*********ASP.NET管道和.NET Core管道区别

http://www.cnblogs.com/niklai/p/5665272.html

**********MVC源码学习

https://www.cnblogs.com/landeanfen/p/5989092.html

Http请求处理流程 管道流程 MVC扩展HttpModule

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