After binding ListBox.SelectedItemProperty, as if the update of the bound value was after the SelectionChanged event was triggered?

[WenLiHou]

After binding ListBox.SelectedItemProperty, in the SelectionChanged event, the value of ListBox.SelectedItem is inconsistent with the bound property, as if the update of the bound value was after the SelectionChanged event was triggered, which caused me to not be able to bind passing CommandParameters when creating a custom Command in custom Control.

[WenLiHou]

`
public HomeView()
{
InitializeComponent();

  listbox.ItemsSource = new List<string> { "a", "b", "c" };

  listbox.Bind(ListBox.SelectedItemProperty, new Binding
  {
      Source = this,
      Path = nameof(TestItem)
  });

  listbox.SelectionChanged += Listbox_SelectionChanged;

}

public object? TestItem { get; set; }

private void Listbox_SelectionChanged(object? sender, SelectionChangedEventArgs e)
{

  var a = listbox.SelectedItem;

  var b = TestItem;

}
`

[timunie]

TestItem need to report its new value back. So it needs to send a PropertyChanged-event but it does not acc. to your snipped

[WenLiHou]

last time i selected “a”, this time i selected "c" ,the value of TestItem updated after SelectionChanged Event by Avalonia

[WenLiHou]

If the next time I select “b”, the TestItem is updated to “c”

[MrJul]

Can you please try latest nightly builds? This should have been fixed by #13503.

[WenLiHou]

I tried，it's ok.