CanExecuteRoutedEventArgs.CanExecute Property

 
System_CAPS_noteNote

The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

Gets or sets a value that indicates whether the RoutedCommand associated with this event can be executed on the command target.

Namespace:   System.Windows.Input
Assembly:  PresentationCore (in PresentationCore.dll)

Public Property CanExecute As Boolean

Property Value

Type: System.Boolean

true if the event can be executed on the command target; otherwise, false. The default value is false.

Many command sources, such as MenuItem and Button, are disabled when CanExecute is false and enabled when the CanExecute is true.

The follow example creates a CanExecuteRoutedEventHandler that only returns true if the command target is a control. First the Source event data is cast to a Control. If it is a Control, CanExecute is set to true; otherwise, it is set to false.

' CanExecuteRoutedEventHandler that only returns true if
' the source is a control.
Private Sub CanExecuteCustomCommand(ByVal sender As Object, ByVal e As CanExecuteRoutedEventArgs)
	Dim target As Control = TryCast(e.Source, Control)

	If target IsNot Nothing Then
		e.CanExecute = True
	Else
		e.CanExecute = False
	End If
End Sub

.NET Framework
Available since 3.0
Return to top
Show: