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CommandBinding::CanExecute Event

Visual Studio 2010

Occurs when the command associated with this CommandBinding initiates a check to determine whether the command can be executed on the command target.

Namespace:  System.Windows.Input
Assembly:  PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

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public:
 event CanExecuteRoutedEventHandler^ CanExecute {
	void add (CanExecuteRoutedEventHandler^ value);
	void remove (CanExecuteRoutedEventHandler^ value);
}
XAML Attribute Usage
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<object CanExecute="CanExecuteRoutedEventHandler" .../>

Identifier field

CanExecuteEvent

Routing strategy

Bubbling

Delegate

CanExecuteRoutedEventHandler

When the CanExecute method on a RoutedCommand is called, the PreviewCanExecute event is raised on the command target. If the event is not handled, the CanExecute event is raised. If the command target has a CommandBinding for the command, the CanExecute handler for that CommandBinding is called. If the command target does not have a CommandBinding for the command, the CanExecute event bubbles up the element tree searching for an element that has a CommandBinding associated with the command.

The following example creates a CommandBinding that maps an ExecutedRoutedEventHandler and a CanExecuteRoutedEventArgs handler to the Open command.

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<Window.CommandBindings>
  <CommandBinding Command="ApplicationCommands.Open"
                  Executed="OpenCmdExecuted"
                  CanExecute="OpenCmdCanExecute"/>
</Window.CommandBindings>
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No code example is currently available or this language may not be supported.

The following shows the CanExecuteRoutedEventHandler which sets CanExecute to true.

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No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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