dotnet/Documentation/compatibility/wpf-selector-crash-when-removing-item-from-custom-collection.md

Crash in Selector when removing an item from a custom INCC collection

Scope

Minor

Version Introduced

4.7

Version Reverted

4.7.1

Source Analyzer Status

NotPlanned

Change Description

An T:System.InvalidOperationException can occur in the following scenario:

• The ItemsSource for a T:System.Windows.Controls.Primitives.Selector is a collection with a custom implementation of T:System.Collections.Specialized.INotifyCollectionChanged.
• The selected item is removed from the collection.
• The T:System.Collections.Specialized.NotifyCollectionChangedEventArgs has P:System.Collections.Specialized.NotifyCollectionChangedEventArgs.OldStartingIndex = -1 (indicating an unknown position).

The exception's callstack begins at System.Windows.Threading.Dispatcher.VerifyAccess() at System.Windows.DependencyObject.GetValue(DependencyProperty dp) at System.Windows.Controls.Primitives.Selector.GetIsSelected(DependencyObject element)

This exception can occur in .Net 4.5 if the application has more than one Dispatcher thread. In .Net 4.7 the exception can also occur in applications with a single Dispatcher thread. The issue is fixed in .Net 4.7.1.

• Quirked
• Build-time break

Recommended Action

Upgrade to .Net 4.7.1.

Affected APIs

• Not detectable via API analysis

Category

Windows Presentation Foundation (WPF)