InvalidOperationException when SelectedItem changes in ObservableCollection #20642
Description
Describe the bug
Avalonia 11.3.11
.NET 10
Windows 11 23H2 x64
I am running some UI tests and this bug shows up on Visual Studio. It doesn't crash the app, but this wasn't happening with the previous Avalonia version (11.0.5).
Seems related to SelectedItem and SelectedItems binding in a TreeView.
When I remove an item from an ObservableCollection bound to a TreeView, this Exception arises:
System.InvalidOperationException: 'Cannot change ObservableCollection during a CollectionChanged event.'
XAML:
<TreeView
x:Name="itemsTree"
Margin="0 40 0 20"
ItemsSource="{Binding Items}"
SelectedItem="{Binding CollectionGroupSelectedItem, Mode=TwoWay}"
SelectedItems="{Binding CollectionGroupSelectedItems, Mode=TwoWay}"
SelectionMode="Multiple"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
Classes="sidebar DragAndDrop CollectionOrganizationItemDragAndDrop">ViewModel:
public override ObservableCollection<CollectionViewModel> Items { get; }
public ObservableCollection<CollectionOrganizationItemViewModel> CollectionGroupSelectedItems { get; }
private CollectionOrganizationItemViewModel? collectionGroupSelectedItemField;
public CollectionOrganizationItemViewModel? CollectionGroupSelectedItem
{
get => this.collectionGroupSelectedItemField;
set
{
this.RaiseAndSetIfChanged(ref this.collectionGroupSelectedItemField, value);
this.onCollectionsGroupItemSelected(this.collectionGroupSelectedItemField);
}
}
private readonly Action<CollectionOrganizationItemViewModel?> onCollectionsGroupItemSelected;To Reproduce
Expected behavior
No response
Avalonia version
11.3.11
OS
Windows
Additional context
No response