CanExecuteRoutedEventArgs.CanExecute Property

public:
 property bool CanExecute { bool get(); void set(bool value); };

public bool CanExecute { get; set; }

member this.CanExecute : bool with get, set

Public Property CanExecute As Boolean

Property Value

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

Examples

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 void CanExecuteCustomCommand(object sender, 
 CanExecuteRoutedEventArgs e)
{
 Control target = e.Source as Control;
 
 if(target != null)
 {
 e.CanExecute = true;
 }
 else
 {
 e.CanExecute = 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

Remarks

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

See also

• CanExecuteRoutedEventHandler
• CommandBinding
• CommandManager