WPF showing dialog before main window.

Question

How one can show dialog window (e.g. login / options etc.) before the main window?

Here is what I tried (it apparently has once worked, but not anymore):

XAML:

<Application ...
    Startup="Application_Startup">

Application:

public partial class App : Application
{
    private void Application_Startup(object sender, StartupEventArgs e)
    {
        Window1 myMainWindow = new Window1();
        DialogWindow myDialogWindow = new DialogWindow();
        myDialogWindow.ShowDialog();
    }
}

Outcome: myDialogWindow is shown first. When it is closed, the Window1 is shown as expected. But as I close Window1 the application does not close at all.

Answer 1

So you want to show one window, then another, but close down the app when that window is closed? You may need to set the ShutdownMode to OnMainWindowClose and set the MainWindow to Window1, along the lines ok:

Window1 myMainWindow = new Window1();
Application.Current.ShutdownMode = ShutdownMode.OnMainWindowClose;
Application.Current.MainWindow = myMainWindow;
DialogWindow myDialogWindow = new DialogWindow();
myDialogWindow.ShowDialog();

Answer 2

here, do it like this. this will actaully change your main window and will work properly w/o having to change settings of your application object.

make sure to remove the event handler for application startup and to set your StartupUri in your app.xaml file.

public partial class App : Application
{
   bool init = false;
   protected override void OnActivated(EventArgs e)
   {
      base.OnActivated(e);
      if (!init)
      {
         this.MainWindow.Closing += new System.ComponentModel.CancelEventHandler(MainWindow_Closing);
         init = true;
      }
   }

   void MainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
   {
      Window toClose = this.MainWindow;
      this.MainWindow = new Window2();
      this.MainWindow.Show();
   }
}

Answer 3

Okay apologizes, here is the solution:

My original question worked almost, only one thing to add, remove the StartupUri from the Application XAML and after that add the Show to main window.

That is:

<Application x:Class="DialogBeforeMainWindow.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Startup="Application_Startup">

Above, StartupUri removed.

Add myMainWindow.Show() too:

public partial class App : Application
{

    private void Application_Startup(object sender, StartupEventArgs e)
    {
        Window1 myMainWindow = new Window1();
        DialogWindow myDialogWindow = new DialogWindow();
        myDialogWindow.ShowDialog();
        myMainWindow.Show();
    }

}