084 ICommand.CanExecuteChanged event behaviour changed in .NET 4.5.md

84: ICommand.CanExecuteChanged event behaviour changed in .NET 4.5

Scope

Minor

Version Introduced

4.5

Version Reverted

4.5

Source Analyzer Status

Planned

Change Description

In the .NET Framework 4.5, a CanExecuteChangedEvent was ignored unless the sender of the event was the same object as the object that raised the event. This bug was fixed in .NET Framework 4.5 servicing updates.

• Quirked
• Build-time break

Recommended Action

This bug has been fixed in the .NET Framework 4.5 servicing releases, so it can be avoided by making sure that the .NET Framework is up-to-date or by upgrading to .NET Framework 4.5.1. Alternatively, application code using ICommand can be modified to make sure that the sender when raising a CanExecuteChanged command is the same as the object raising the event.

Affected APIs

• E:System.Windows.Input.ICommand.CanExecuteChanged

Category

Windows Presentation Foundation (WPF)

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