WPF SplashScreen with ProgressBar

Here is my diagram for this. My motivation for this is that I do not want the initialization code to work in the user interface thread, and usually I need the initialization code in my App class (and not the splash screen).

Basically, I install the application StartupUriin my splash screen, which receives the ball.

On the splash screen, I call the delegate back to the application. This runs on a workflow. In the splash screen, I process EndInvokeand close the window.

, . Slash, .

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....

<Application x:Class="SplashScreenDemo.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    StartupUri="Splash.xaml">
    <Application.Resources>

    </Application.Resources>
</Application>

...

internal delegate void Invoker();
public partial class App : Application
{
    public App()
    {
        ApplicationInitialize = _applicationInitialize;
    }
    public static new App Current
    {
        get { return Application.Current as App; }
    }
    internal delegate void ApplicationInitializeDelegate(Splash splashWindow);
    internal ApplicationInitializeDelegate ApplicationInitialize;
    private void _applicationInitialize(Splash splashWindow)
    {
        // fake workload, but with progress updates.
        Thread.Sleep(500);
        splashWindow.SetProgress(0.2);

        Thread.Sleep(500);
        splashWindow.SetProgress(0.4);

        Thread.Sleep(500);
        splashWindow.SetProgress(0.6);

        Thread.Sleep(500);
        splashWindow.SetProgress(0.8);

        Thread.Sleep(500);
        splashWindow.SetProgress(1);

        // Create the main window, but on the UI thread.
        Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Invoker)delegate
        {
            MainWindow = new Window1();
            MainWindow.Show();
        });           
    }
}

splash xaml ( , ...)

<Window x:Class="SplashScreenDemo.Splash"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Splash" Height="300" Width="300">
    <Grid>
        <TextBlock Height="21" Margin="91,61,108,0" VerticalAlignment="Top">Splash Screen</TextBlock>
        <ProgressBar Name="progBar" Margin="22,122,16,109" Minimum="0" Maximum="1"/>
    </Grid>
</Window>

...

public partial class Splash : Window
{
    public Splash()
    {
        InitializeComponent();
        this.Loaded += new RoutedEventHandler(Splash_Loaded);
    }

    void Splash_Loaded(object sender, RoutedEventArgs e)
    {
        IAsyncResult result = null;

        // This is an anonymous delegate that will be called when the initialization has COMPLETED
        AsyncCallback initCompleted = delegate(IAsyncResult ar)
        {
            App.Current.ApplicationInitialize.EndInvoke(result);

            // Ensure we call close on the UI Thread.
            Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Invoker)delegate { Close(); });
        };

        // This starts the initialization process on the Application
        result = App.Current.ApplicationInitialize.BeginInvoke(this, initCompleted, null);
    }

    public void SetProgress(double progress)
    {
        // Ensure we update on the UI Thread.
        Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Invoker)delegate { progBar.Value = progress; });           
    }
}

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