Halius
1/14/2019 - 6:49 PM

WPF Exception

Exception handling is a very important part of any application and fortunately, WPF and .NET makes it very easy to handle exceptions both locally and globally. You should handle exceptions locally when it makes sense and only use the global handling as a fallback mechanism, since local handling allows you to be more specific and deal with the problem in a more specialized way. We handle the exception much like the local one, but with a slightly different text and image in the message box. Also, notice that I set the e.Handled property to true. This tells WPF that we're done dealing with this exception and nothing else should be done about it.

WPFExceptionHandling.xaml
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<Application x:Class="WpfTutorialSamples.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             DispatcherUnhandledException="Application_DispatcherUnhandledException" //<~~~~~~~~~~
             StartupUri="WPF Application/ExceptionHandlingSample.xaml">
    <Application.Resources>
    </Application.Resources>
</Application>

//C# 
private void Application_DispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
		{
			MessageBox.Show("An unhandled exception just occurred: " + e.Exception.Message, "Exception Sample", MessageBoxButton.OK, MessageBoxImage.Warning);
			e.Handled = true;
		}