How to show new window/dialog in WinUI3?

Question

My project contains two window, login and main

After login success, I need to open main window and close login window,I try:

            var mainForm = new MainForm();
            mainForm.Activate();
            Close();

It seems works, but I am very confused, because in App.xaml.cs OnLaunched:

        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
        {
            m_window = new LoginForm();
            m_window.Activate();
        }

Do I have to set the m_window to newly opened MainForm?

But how to access the m_window？

And how to ShowDialog in WinUI3?

Answer 1

You can first open the Login Form (Login here) :

        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
        {
            m_window = new Login();
            m_window.Activate();
        }

and in Login Form you can display the Main window when it is closed on OK Button (if User/Password is OK) :

        this.Closed += Login_Closed;

        private Window m_window;
        private void Login_Closed(object sender, WindowEventArgs args)
        {
            m_window = new MainWindow();
            m_window.Activate();
        }

Test :

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