WPF：我可以在哪里捕获应用程序崩溃事件？

Question

I put this code in my entry point :

   public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
            Dispatcher.UnhandledException += Dispatcher_UnhandledException;
            AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;

        }

        private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            throw new NotImplementedException();
        }

        private void Dispatcher_UnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
        {
            throw new NotImplementedException();
        }
    }

And add this code into some button click:

int num = 10;
int t = 5;
t = t - 5;
int error = num / t;

And my application crash but not go into this events.

Answer 1

Try adding this code in App.xaml.cs

public App() : base() {
    this.Dispatcher.UnhandledException += OnDispatcherUnhandledException;
}

void OnDispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e) {
    MessageBox.Show("Unhandled exception occurred: \n" + e.Exception.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}

Answer 2

If you run in debug mode then your app will break as soon as you hit an error. You would need to disable that. Press Ctrl + Alt + E to see the Exception settings window and uncheck some. Remember to turn it back though.

The full list of handlers: https://code.msdn.microsoft.com/windowsdesktop/Handling-Unhandled-47492d0b

You can simulate an error just by throwing one. https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/exceptions/creating-and-throwing-exceptions