CanExecuteRoutedEventArgs.CanExecute Property

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 function get CanExecute () : boolean 
public function set CanExecute (value : boolean)
Members of this class are either not typically used in XAML, or cannot be used in XAML.

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 void CanExecuteCustomCommand(object sender, 
    CanExecuteRoutedEventArgs e)
{
    Control target = e.Source as Control;

    if(target != null)
    {
        e.CanExecute = true;
    }
    else
    {
        e.CanExecute = false;
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

ADD
Show:
© 2014 Microsoft