mvc拦截请求IHttpModule

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Diagnostics;

namespace TestMVCRoute
{
    public class myMVCHttpHandler :IHttpModule
    {
        public void Dispose()
        {
            /* Not needed */
        }

        public void Init(HttpApplication context)
        {
            context.BeginRequest += OnBeginRequest;
            context.EndRequest += OnEndRequest;
            context.PreSendRequestHeaders += OnHeaderSent;
        }
        public void OnHeaderSent(object sender, EventArgs e)
        {
            var httpApp = (HttpApplication)sender;
            httpApp.Context.Items["HeadersSent"] = true;
        }

        // Record the time of the begin request event.
        public void OnBeginRequest(Object sender, EventArgs e)
        {
            var httpApp = (HttpApplication)sender;
            if (httpApp.Request.Path.StartsWith("/media/")) return;
            var timer = new Stopwatch();
            httpApp.Context.Items["Timer"] = timer;
            httpApp.Context.Items["HeadersSent"] = false;
            timer.Start();
        }

        public void OnEndRequest(Object sender, EventArgs e)
        {
            var httpApp = (HttpApplication)sender;
            if (httpApp.Request.Path.StartsWith("/media/")) return;
            var timer = (Stopwatch)httpApp.Context.Items["Timer"];

            if (timer != null)
            {
                timer.Stop();
                if (!(bool)httpApp.Context.Items["HeadersSent"])
                {
                    httpApp.Context.Response.AppendHeader("ProcessTime",
                                                          ((double)timer.ElapsedTicks / Stopwatch.Frequency) *  +
                                                          " ms.");
                }
            }

            httpApp.Context.Items.Remove("Timer");
            httpApp.Context.Items.Remove("HeadersSent");

        }

    }
}

webconfig注册：

  <httpModules>
      <add name="myMVCHttpHandler" type="TestMVCRoute.myMVCHttpHandler"/>
  </httpModules>
</system.web>

或者节点：

<modules runAllManagedModulesForAllRequests="true">
      <add name="myMVCHttpHandler" type="TestMVCRoute.myMVCHttpHandler" />
    </modules>
</system.webServer>

ii6和ii7及以上注册节点结构不同需要注意，所以才贴出了两点。

改文章复制粘贴自：https://stackoverflow.com/questions/11726848/asp-net-mvc-4-intercept-all-incoming-requests

文章标题：ASP.NET MVC 4 intercept all incoming requests

不过前辈们建议，你最好分清你需要拦截的是什么请求，你的目的是什么，如果是在知情Action控制前拦截，那么你最好使用过滤器，而不是注册一个自定义的IHttpModule。

文章：msdn.microsoft.com/en-us/library/gg416513(VS.98).aspx

或者也可以直接在Global.asax.cs文件中使用：

 protected void Application_BeginRequest(object sender, EventArgs e)
    {
        HttpContext.Current.Request.....;
    }

默认mvc的Global.asax.cs中没有Application_BeginRequest方法，但是自己复制粘贴过去会起作用，原理是什么还不清楚。

最建议的拦截mvc请求的方式还是用过滤器，

public class DebugActionFilter : System.Web.Mvc.ActionFilterAttribute
{
  public override void OnActionExecuting(ActionExecutingContext actionContext)
  {
     Debug.WriteLine(actionContext.RequestContext.HttpContext.Request);
  }
}