來自HTTPModule的訪問會話變量

Question

如何從HttpModule訪問會話變量？

I SET以下會話變量中的.cs頁，這是我想在HttpModule訪問：

會話[ 「用戶名」] = 「等等」

Answer 1

下面是使用的一個例子在HttpModule中的會話，發現here：

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

// This code demonstrates how to make session state available in HttpModule, 
// regradless of requested resource. 
// author: Tomasz Jastrzebski 

public class MyHttpModule : 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) { 
     // no need to replace the current handler 
     return; 
     } 

     // swap the current handler 
     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) { 
     // set the original handler back 
     HttpContext.Current.Handler = resourceHttpHandler.OriginalHandler; 
     } 

     // -> at this point session state should be available 

     Debug.Assert(app.Session != null, "it did not work :("); 
    } 

    public void Dispose() 
    { 

    } 

    // a temp handler used to force the SessionStateModule to load session state 
    public class MyHttpHandler : IHttpHandler, IRequiresSessionState 
    { 
     internal readonly IHttpHandler OriginalHandler; 

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

     public void ProcessRequest(HttpContext context) 
     { 
     // do not worry, ProcessRequest() will not be called, but let's be safe 
     throw new InvalidOperationException("MyHttpHandler cannot process requests."); 
     } 

     public bool IsReusable 
     { 
     // IsReusable must be set to false since class has a member! 
     get { return false; } 
     } 
    } 
} 

Answer 2

我建議一種侵入性較小的方法。 只需強制ASP.NET運行時使用SetSessionStateBehavior（）向您的模塊公開會話（IRequiresSessionState的實現僅被視爲IHttpHandlers）。

public void Init(HttpApplication httpApp) 
{ 
    //SESSION WILL BE AVAILABLE IN ALL EVENTS FROM PreRequestHandlerExecute TO PostRequestHandlerExecute 
    httpApp.PostRequestHandlerExecute += OnPostRequestHandlerExecute; 
    //THIS IS THE IMPORTANT LINE 
    httpApp.Context.SetSessionStateBehavior(SessionStateBehavior.ReadOnly); 
}