CODEWITHSUNDEEP
c#wpfexception
John Threepwood
John Threepwood

Reputation: 16143

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

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?

Upvotes: 2

Views: 342

Answers (2)

paparazzo
paparazzo

Reputation: 45096

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;
   }
}

Upvotes: 0

Allan Elder
Allan Elder

Reputation: 4094

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
    }
}

}

Upvotes: 1

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