WPF - choose startup window based on some condition

Question

When running my program by clicking Run or pressing Ctrl + F5, is it possible to open different windows based on some check condition?

I.e

Answer 1

look into App.xaml

remove StartupUri="MainWindow.xaml"

add Startup="Application_Startup" new event Handler

form code behind App.xaml.cs create Application_Startup like...

    private void Application_Startup(object sender, StartupEventArgs e)
    {
        //add some bootstrap or startup logic 
        var identity = AuthService.Login();
        if (identity == null)
        {
            LoginWindow login = new LoginWindow();
            login.Show();
        }
        else
        {
            MainWindow mainView = new MainWindow();
            mainView.Show();
        }
    }