Avalonia/tests/BuildTests/BuildTests/MainView.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:BuildTests"
             x:Class="BuildTests.MainView"
             x:DataType="local:MainViewModel"
             Width="400" Height="300">

  <UserControl.DataContext>
    <local:MainViewModel />
  </UserControl.DataContext>

  <TextBlock
    x:Name="TextBlock"
    x:FieldModifier="public"
    Text="{CompiledBinding HelloText}"
    HorizontalAlignment="Center"
    VerticalAlignment="Center" />

</UserControl>