Open new window after splash window in wpf - wpf

Question

I have three window which suppose to come in this order:
Splash window
Selection window
Working window, this is main window
splash window should appear for 3 seconds and I have done it like this way and it's working fine:
private void Window_Loaded(object sender, RoutedEventArgs e)
{
loadingThread = new Thread(load);
loadingThread.Start();
}
private void load()
{
Thread.Sleep(3000);
//close the window
this.Dispatcher.Invoke(DispatcherPriority.Normal, (Action)delegate() { Close(); });
}
After that selection window should appear and after that working window should come.
Mainwindow code is here:
public partial class MainWindow : Window
{
private MainWindowViewModel mainWindowViewModel;
public MainWindow()
{
InitializeComponent();
this.mainWindowViewModel = new MainWindowViewModel(this);
base.DataContext = this.mainWindowViewModel;
SplashWindow wnd = new SplashWindow("text");
wnd.ShowDialog();
}
}
Tell me how can I open my window in that sequence
and one more thing on selection window, I have one button after pressing that my working window should come.

Answer 1

Edit
Without using async & await
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
// Create and show SplashWindow
SplashWindow splashWindow = new SplashWindow();
splashWindow.Show();
var thread = new System.Threading.Thread(p =>
{
System.Threading.Thread.Sleep(3000);
Dispatcher.Invoke(() =>
{
// Create and show the SelectionWindow
SelectionWindow selectionWindow = new SelectionWindow();
selectionWindow.Show();
// Hide the SplashWindow we previosly created
splashWindow.Close();
});
});
thread.Start();
}
}
Gist with sample application: click here
I'm assuming that this is your project's structure:
App.xaml
MainWindow
SelectionWindow
SplashWindow
first, on your App.xaml, remove StartupUri attribute so it will look like:
<Application x:Class="WpfApplication2.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Application.Resources>
</Application.Resources>
</Application>
Then, on your App.xaml.cs, override OnStartup:
async protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
// Create and show SplashWindow
SplashWindow splashWindow = new SplashWindow();
splashWindow.Show();
// Let's wait 3 seconds
await Task.Delay(3000);
// Create and show the SelectionWindow
SelectionWindow selectionWindow = new SelectionWindow();
selectionWindow.Show();
// Hide the SplashWindow we previosly created
splashWindow.Close();
}
Then, in your SelectionWindow, add a button with a click event:
private void Button_Click(object sender, RoutedEventArgs e)
{
// Create and show MainWindow
var mainWindow = new MainWindow();
mainWindow.Show();
// Closes SelectionWindow
this.Close();
}