Dispatcher.BeginInvoke versus Dispatcher.InvokeAsync

gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
namespace ExampleWPF
{
    public partial class MainWindow
    {
        public MainWindow()
        {
            InitializeComponent();
            CallAsync();
            Call();
        }

        //http://msdn.microsoft.com/en-us/library/cc190824(v=vs.110).aspx
        private void Call()
        {
            Application.Current.Dispatcher.BeginInvoke(
               //Do stuff
              );
        }

        // .Net 4.5
        //http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher.invokeasync(v=vs.110).aspx
        private async void CallAsync()
        {
            await Application.Current.Dispatcher.InvokeAsync(
                //Dostuff
                );
        }
    }
}

Leap code

        private void SetCanvas(UIElement image, Point point, bool allowkill)
        {
            Dispatcher.BeginInvoke(
                new Action(
                    delegate
                    {
                        Canvas.SetTop(image, point.Y - (finger.ActualHeight/2));
                        Canvas.SetLeft(image, point.X - (finger.ActualWidth/2));

                        if (allowkill)
                            TryKillBugs(image, 200, 200);
                    }
                    ));

            Dispatcher.InvokeAsync(() =>
            {
                Canvas.SetTop(image, point.Y - (finger.ActualHeight / 2));
                Canvas.SetLeft(image, point.X - (finger.ActualWidth / 2));

                if (allowkill)
                    TryKillBugs(image, 200, 200);
            });
        }