Manage unhandled exceptions that are thrown on secondary worker threads.

   
  

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="WpfApplication1.MainWindow"
  Height="200" Width="400">

  <Button Click="aClick">Thread</Button>

</Window>
//File:Window.xaml.cs

using System; 
using System.Threading; 
using System.Windows; 
using System.Windows.Threading;

namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            this.Title = string.Format("Running on Main UI Thread {0}", Thread.CurrentThread.ManagedThreadId);
        }

        void aClick(object sender, RoutedEventArgs e)
        {
            Thread thread = new Thread(aMethod);
            thread.SetApartmentState(ApartmentState.STA);
            thread.IsBackground = true;
            thread.Start();
        }
        void aMethod(){
            try{
                string msg = string.Format("secondary on worker thread {0}.", Dispatcher.CurrentDispatcher.Thread.ManagedThreadId);
                throw new Exception(msg);
            }catch (Exception ex){
                int secondaryWorkerThreadId = Thread.CurrentThread.ManagedThreadId;
                Application.Current.Dispatcher.Invoke(
                    DispatcherPriority.Send,
                    (DispatcherOperationCallback)delegate(object arg)
                    {
                        string msg = string.Format("from secondary worker thread {0}.", secondaryWorkerThreadId);
                        throw new Exception(msg, ex);
                    }
                    , null);
            }
        }

    }
}