c# – UrlRewriter HttpModule会话问题

我需要使用HttpModule编写一个自定义的“UrlRewriter”,在“重写”的那一刻我需要访问Session并遵循另一个SO线程的建议：

Can I access session state from an HTTPModule?

一切正常,RewritePath / Redirect部分除外.我没有任何例外,但浏览器需要永远加载.这真的是构建像这样的urlrewriter的最好方法吗？

using System;
using System.Web;
using System.Web.SessionState;
using System.Diagnostics;

namespace MyCompany.Campaigns
{

    public class CampaignRewriteModule : IHttpModule
    {
        public void Init(HttpApplication application)
        {
            application.PostAcquireRequestState += new EventHandler(Application_PostAcquireRequestState);
            application.PostMapRequestHandler += new EventHandler(Application_PostMapRequestHandler);
        }

        void Application_PostMapRequestHandler(object source, EventArgs e)
        {
            HttpApplication app = (HttpApplication)source;

            if (app.Context.Handler is IReadOnlySessionState || app.Context.Handler is IRequiresSessionState)
            {
                return;
            }

            app.Context.Handler = new MyHttpHandler(app.Context.Handler);
        }

        void Application_PostAcquireRequestState(object source, EventArgs e)
        {
            HttpApplication app = (HttpApplication)source;

            MyHttpHandler resourceHttpHandler = HttpContext.Current.Handler as MyHttpHandler;

            if (resourceHttpHandler != null)
            {
                HttpContext.Current.Handler = resourceHttpHandler.OriginalHandler;
            }

            Debug.Assert(app.Session != null);


            string path = HttpUtils.Path();

            if (!CampaignCodeMethods.IsValidCampaignCode(path)) return;

            string domain = HttpUtils.Domain();

            CampaignCode code = CampaignManager.RegisterCode(path, domain.Equals(Config.Instance.Domain.ToLower()) ? null : domain);

            if (code != null)
            {
               //app.Context.RewritePath(code.CampaignCodePath.Path, false);
               app.Context.Response.Redirect(code.CampaignCodePath.Path, true);
            }


        }

        public void Dispose() { }

        public class MyHttpHandler : IHttpHandler, IRequiresSessionState
        {
            internal readonly IHttpHandler OriginalHandler;

            public MyHttpHandler(IHttpHandler originalHandler)
            {
                OriginalHandler = originalHandler;
            }

            public void ProcessRequest(HttpContext context)
            {
                throw new InvalidOperationException("MyHttpHandler cannot process requests.");
            }

            public bool IsReusable
            {
                get { return false; }
            }
        }

    }

}

我想我知道它是什么.您的模块在所有请求上执行,并分配一个抛出错误的处理程序,除非有一个有效的活动代码(发生重写/重定向).

但是因为这不仅仅是因为你的“处理程序广告系列代码”网址导致错误被抛出,这导致您被重定向到错误页面,该错误页面被模块捕获,该模块正在分配处理程序,抛出错误,重定向…我想你到了我要去的地方;)

否则我会尝试一些事情：

>设置Fiddler并检查无限重定向循环>在app.Context.Response.Redirect上放置一个断点 – 确保你不在无限循环中>在MyHttpHandler.ProcessRequest上放置一个断点 – 确保它没有被调用并吞下异常