WinUI 3 with C++ and XAML but without MIDL

You can define WinUI 3 UIs with XAML. Classes reffered in XAML should be Windows runtime classes which you define with MIDL. Creating Windows Runtime classes is a little bit hard. This repositry provides information aboud how to define UIs with XAML but without MIDL.

Define UIs in C++

See WinUI 3 in C++ Without XAML

Define UIs in XAML instead of C++ code

1. Add MainPage.xaml file to define UIs.

   // MainPage.xaml
   <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
       <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
           <TextBlock>Hello World!</TextBlock>
       </StackPanel>
   </Window>

2. Load XAML file and assign it as a UIElement object.

   window = Window();
   Application::LoadComponent(window, Uri(L"ms-appx:///MainPage.xaml"));

Build and run

You can see a window displaying "Hello World!"

Note

You need to implement event hundlers and binding in C++ code. If you want to do it in XAML, you need to create Windows Runtime class with MIDL.