Global Exception Handling in WPF

In XAML, you can hook an application-level event that will fire whenever an unhandled error occurs anywhere in your application by overriding the OnStartup event in the App.xaml.cs file.

Here's an example excerpt:

protected override void OnStartup(StartupEventArgs e)
{
   // define application exception handler
   Application.Current.DispatcherUnhandledException  += new 
      DispatcherUnhandledExceptionEventHandler(
         AppDispatcherUnhandledException);

   // defer other startup processing to base class
   base.OnStartup(e);
}    
        
void AppDispatcherUnhandledException(object sender, 
   DispatcherUnhandledExceptionEventArgs e)
{
   //do whatever you need to do with the exception
   //e.Exception

   e.Handled = true;
}

Now the AppDispatcherUnhandledException event will fire whenever your code doesn't handle the exception at a lower level. The exception itself is in the DsipatcherUnhandledExceptionEventArgs object (e.Exception).