Avalonia/samples/ControlCatalog/Pages/PlatformInfoPage.xaml

<UserControl x:Class="ControlCatalog.Pages.PlatformInfoPage"
             xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             d:DesignHeight="800"
             d:DesignWidth="400"
             mc:Ignorable="d">
  <StackPanel>
    <TextBlock Text="{Binding PlatformInfo}" />
  </StackPanel>
</UserControl>