Asp – accessing SessionState in Global.Application_Error

asp.netglobal-asaxsession-state

In the Application_Error method in Global.asax I am trying to retrieve a value from session state.

I am able to access session state as long as I throw the exception. EG:

thow new Exception("Test exception");

However if it is an unhandled exception, i get the following error when trying to access session state: "Session state is not available in this context.".

Why the differences in behavior, is there a work around?

Thanks.

Best Solution

I hate ASP.NET sometimes...

So generating an error using:

Response.Redirect("thispagedoesnotexist.aspx", false);

The above line will redirect to Application_Error with session state not available

However

throw new Exception("test");

The above line will redirect to Application_Error with session state AVAILABLE

So instead of doing this all in Application_Error, in one spot, I will have to use try/catches through out my code to catch errors. Then gather data from session, log and email error details, then finally redirect to friendly error page. Lots of extra code..

Conclusion: Application_Error is worthless.

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Wow. I found the answer to this. Use the variable HttpRuntime.Cache instead of Context.Cache.

C# – Accessing SessionState in IHttpModule after 404

    public class ExceptionModule : IHttpModule
    {
        #region IHttpModule Members

        public void Dispose()
        {

        }

    /// <summary>
    /// Init method to register the event handlers for 
    /// the HttpApplication
    /// </summary>
    /// <param name="application">Http Application object</param>
    public void Init(HttpApplication application)
    {
        application.Error += this.Application_Error;
    }




    private void Application_Error(object sender, EventArgs e)
    {

                    // Create HttpApplication and HttpContext objects to access
                    // request and response properties.
                    var application = (HttpApplication)sender;
                    var context = application.Context;
                    application.Session["errorData"] = "yes there is an error";

                    context.Server.Transfer("Error.aspx");

         }
}

This should do the trick! works for me!

Best Solution

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