wpf - How can I register an AvaloniaProperty to set control's focus and bind in viewmodel?

Question

I am developing an avalonia wpf application, and I registered an AttachedProperty "IsFocused" as following:

public class FocusExtension
{
    public static readonly AttachedProperty<bool> IsFocusedProperty =
        AvaloniaProperty.RegisterAttached<Control, bool>("IsFocused", typeof(FocusExtension));

    public static bool GetIsFocused(Control element)
    {
        return element.GetValue(IsFocusedProperty);
    }

    public static void SetIsFocused(Control element, bool value)
    {
        element.SetValue(IsFocusedProperty, value);
        OnIsFocusedPropertyChanged(element, value);
    }

    private static void OnIsFocusedPropertyChanged(
        Control element,
        bool e)
    {
        if (e)
        {
            element.Focus();
        }
    }
}

And apply it in xaml like that:

  <Button Content="Test" u:FocusExtension.IsFocused="{Binding SomeBoolPropertyInViewModel}"/>

But it seems not work when "SomeBoolPropertyInViewModel" is set to be true from my ViewModel,

Could someone give me an example or hint to implement this work? Thanks.

Answer 1

等待大神答复