Question:
I want to implement a sessionAccess class, which throws a "SessionExpired"-Exception when an attempt to access an expired session is made. And I want to show a special page for SessionExpired, instead of the YSOD.
This is what I have:
In Global.asax.cs
MvcApplication : System.Web.HttpApplication
{
// http://stackoverflow.com/questions/183316/asp-net-mvc-handleerror
public class SessionExpiredErrorHandlerAttribute : HandleErrorAttribute
{
public override void OnException(ExceptionContext exceptionContext)
{
//Logger.Error(exceptionContext.Exception.Message,exceptionContext.Exception);
//exceptionContext.ExceptionHandled = true;
// http://blog.dantup.com/2009/04/aspnet-mvc-handleerror-attribute-custom.html
UrlHelper url = new UrlHelper(HttpContext.Current.Request.RequestContext);
string messagePageUrl = url.Action("SessionExpired", "Home").ToString();
System.Web.HttpContext.Current.Response.Redirect(messagePageUrl, true);
base.OnException(exceptionContext);
} // End Sub OnException
} // End Class MyErrorHandlerAttribute
// http://freshbrewedcode.com/jonathancreamer/2011/11/29/global-handleerrorattribute-in-asp-net-mvc3/
// <customErrors mode="On" />
// <customErrors mode="RemoteOnlyy" />
public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
filters.Add(new HandleErrorAttribute());
filters.Add(new SessionExpiredErrorHandlerAttribute
{
ExceptionType = typeof(WebApplications.SessionAccess.SessionExpiredException),
View = "@btw WHY is anything I write here ignored ???, and why TF can one only set the view, and not the controller as well @",
Order = 2
});
} // End Sub RegisterGlobalFilters
}
And this is my SessionAccess class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace WebApplications
{
// http://stackoverflow.com/questions/2950064/detect-when-a-users-session-has-exipred
public class SessionAccess
{
// LoginFailedException
public class SessionExpiredException : System.Exception
{
// The default constructor needs to be defined
// explicitly now since it would be gone otherwise.
public SessionExpiredException()
{
}
public SessionExpiredException(string strKey)
: base("Session \"" + strKey + "\" expired, or was never set.")
{
}
}
static System.Web.SessionState.HttpSessionState Session
{
get
{
if (System.Web.HttpContext.Current == null)
throw new ApplicationException("No Http Context, No Session to Get!");
return System.Web.HttpContext.Current.Session;
}
}
public static T Get<T>(string key)
{
System.Nullable<bool> SessionExists = (System.Nullable<bool>) Session["__sys_" + key + "_hasBeenSet"];
if (SessionExists == null)
throw new SessionExpiredException(key);
if (Session[key] == null)
return default(T);
else
return (T)Session[key];
}
public static void Set<T>(string key, T value)
{
Session["__sys_" + key + "_hasBeenSet"] = true;
Session[key] = value;
}
} // End Class SessionAccess
} // End Namespace WebApplications
And then, in the homecontroller, I implement this view:
public ActionResult TestPage(string id)
{
/*
WebApplications.SessionAccess.Set<string>("foo", "test");
string str = WebApplications.SessionAccess.Get<string>("foo");
Console.WriteLine(str);
Session.Clear();
Session.Abandon();
str = WebApplications.SessionAccess.Get<string>("foo");
Console.WriteLine(str);
*/
throw new Exception("bogus");
return View();
}
Then I have a SessionExpired.cshtml, which I put into Views\Shared
Now, despite custom-error off, I can get the SessionExpired error message. It works fine for SessionExpiredException, but the problem now is, that I get this exception for ANY exception (null reference, applicationexception, etc...)
Can anybody tell my why this is ? I would have assumed I only ever get to this page on a SessionExpiredException...
Why on every other exception as well ????
For some reason, the inner workings of filter seems to be malfunctioning...
