public class MainView : ViewBase<MainViewModel>
{
    public static IValueConverter InverseBooleanConverter { get; } 
        = new FuncValueConverter<bool, bool>(b => !b);

    //This method is executed before View building
    protected override void OnCreated()
    {
        ViewModel = new MainViewModel();
    }

    //Define markup in Build method
    protected override object Build(MainViewModel vm) =>
        new Grid()
            
            .Styles(
                new Style<Button>(s => s.Class(":pointerover")) //make button red when pointer is over using avalonia styles
                    .Background(Brushes.Red)
            )

            .Cols("Auto, 100, *") // equivalent of Grid.ColumnDefintions property
            .Background(Brushes.Green) // the same as grid.Background = Brushes.Green
            .Children(
                
                new TextBlock()
                    .Text( @vm.TextVal ), // use @ character before to Bind control's property to ViewModel's property

                new TextBlock()
                    .Col(1) //equivalent of Grid.SetColumn(textBlock, 1)
                    .IsVisible( @vm.HideGreeting, //bind TextBlock.IsVisible to MainViewModel.HideGreeting property
                                bindingMode: BindingMode.OneWay, // we can set Binding mode if necessery
                                converter: InverseBooleanConverter ), //Set value converter to invert value
                    .Text( "Hello Avalonia" ), 

                new Button()
                    .Col(2) //equivalent of Grid.SetColumn(textBlock, 1)
                    // we don't actually need binding here, 
                    // so just direct set to Command on view model
                    .Command(vm.ClickButtonCommand) 
                    .Content("Click me") // Content = "Click me"
                    .Padding(8, 0, 0, 0) //Set left padding to 8
                    .With(ButtonStyle) //Execute LabelStyle method over TextBlock control 
            );

    private void ButtonStyle(Button b) => b
        .VerticalAlignment(VerticalAlignment.Center)
        .FontSize(12);
}

public class Component : ComponentBase
{
//markup part
    protected override object Build() =>
        new StackPanel()
            .Children(
                new TextBlock()
                    .Ref(out _textBlock1)
                    .Text("Hello world"),
                new TextBlock()
                    .Text(Bind(CounterText)),
                new Button()
                    .Content("Click me")
                    .OnClick(OnButtonClick)
            );
            
//code part
    [Inject] SampleDataService DataService { get; set; } = null!; //service injection

    public int Counter { get; set; }
    public string CounterText => $"Counter: {Counter}";  //no need to implement AvaloniaProperty or OnPropertyChanged behaviors, since component has registry of all properties and emits ProperyChanged event after changing state of component.

    private void OnButtonClick(RoutedEventArgs e)
    {
        Counter++;
        _textBlock1.Text = DataService.GetData();
        StateHasChanged(); //for now we have to call this method manually. In future there will be some additional triggers like user input, that will rise this method automatically
    }
}