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wpf-selector-crash-when-removing-item-from-custom-collection.md

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

  • Quirked
  • Build-time break

Recommended Action

Upgrade to .NET Framework 4.7.1.

Affected APIs

  • Not detectable via API analysis

Category

Windows Presentation Foundation (WPF)