WPF – choose startup window based on some condition

by

look into App.xaml

remove StartupUri="MainWindow.xaml"

add Startup="Application_Startup" new event Handler

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

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();
        }
    }

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