App.xaml.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace XstReader
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        private void Application_Startup(object sender, StartupEventArgs e)
        {
            AppDomain currentDomain = AppDomain.CurrentDomain;
            currentDomain.UnhandledException += CurrentDomain_UnhandledException;
            TaskScheduler.UnobservedTaskException += TaskScheduler_UnobservedTaskException;

            EventManager.RegisterClassHandler(typeof(TreeViewItem), TreeViewItem.PreviewMouseRightButtonDownEvent, new RoutedEventHandler(TreeViewItem_PreviewMouseRightButtonDownEvent));

            MainWindow wnd = new MainWindow();
            if (e.Args.Length == 1)
                wnd.OpenFile(e.Args[0]);
            wnd.Show();
        }

        // In tree views, select item on right click
        private void TreeViewItem_PreviewMouseRightButtonDownEvent(object sender, RoutedEventArgs e)
        {
            (sender as TreeViewItem).IsSelected = true;
        }

        private void TaskScheduler_UnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs e)
        {
            Exception ex = (Exception)e.Exception;
            MessageBox.Show(ex.ToString(), "Unhandled thread exception");
        }

        private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            Exception ex = (Exception)e.ExceptionObject;
            MessageBox.Show(ex.ToString(), "Unhandled exception");
        }
    }
}