How to look up which exception was thrown when running a WPF application?

Question

When I start a WPF application and an exception is thrown by some method the program crashes. For debugging reasons it would be very interesting to see the exception stack. But where will it be printed?

Try this post: http://stackoverflow.com/questions/793100/globally-catch-exceptions-in-a-wpf-application — Tony, Dec 16 '13 at 14:11
And application log too: http://blogs.msdn.com/b/calvin_hsia/archive/2013/07/31/10438571.aspx — Tony, Dec 16 '13 at 14:12
@Tony thank you! Hmm... I was hoping for a simple answer. It is frustating to see there is no easy way. :-( — John Threepwood, Dec 16 '13 at 14:17
You could add a uncaught exception handler. If you want me to post code let me know. — paparazzo, Dec 16 '13 at 14:23
Added a code sample that has an appdomain handler, too. Hope it helps. — Allan Elder, Dec 16 '13 at 14:44

score 1 · Answer 1 · answered Dec 16 '13 at 14:43

You should hook up to the AppDomain.CurrentDomain.UnhandledException event and the Application.DispatcherUnhandledApplication event inside the App constructor or in the App.OnStartup .

public partial class App : Application
{

    //Either here
    public App()
    {
        AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
        Dispatcher.UnhandledException += Dispatcher_UnhandledException;
    }

    //Or here
    protected override void OnStartup(StartupEventArgs e)
    {
        AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
        Dispatcher.UnhandledException += Dispatcher_UnhandledException;
    }

    void Dispatcher_UnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
    {
        //add logging
    }

    void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
    {
        //add logging
    }
}

}

paparazzo · Answer 2 · 2013-12-16T15:04:07.667

In app.xaml.cs just add an uncaught exception handler
Be aware that exceptions from unmanaged code and elude this handler

this.DispatcherUnhandledException += new DispatcherUnhandledExceptionEventHandler(App_DispatcherUnhandledException);

if (!string.IsNullOrEmpty(e.Exception.StackTrace))
{
   sb.AppendLine("e.Exception.StackTrace ");
   int count = 0;
   foreach (string line in e.Exception.StackTrace.Split('\n'))
   {
       sb.AppendLine(line.Trim());
       count++;
       if (count > 10) break;
   }
}

How to look up which exception was thrown when running a WPF application?

2 Answers2