CommandManager.AddPreviewCanExecuteHandler 메서드

정의

네임스페이스:

System.Windows.Input

어셈블리:

PresentationCore.dll

지정된 CanExecuteRoutedEventHandler를 지정된 요소에 연결합니다.

public:
 static void AddPreviewCanExecuteHandler(System::Windows::UIElement ^ element, System::Windows::Input::CanExecuteRoutedEventHandler ^ handler);

public static void AddPreviewCanExecuteHandler (System.Windows.UIElement element, System.Windows.Input.CanExecuteRoutedEventHandler handler);

static member AddPreviewCanExecuteHandler : System.Windows.UIElement * System.Windows.Input.CanExecuteRoutedEventHandler -> unit

Public Shared Sub AddPreviewCanExecuteHandler (element As UIElement, handler As CanExecuteRoutedEventHandler)

매개 변수

element

UIElement

handler를 연결할 요소입니다.

handler

CanExecuteRoutedEventHandler

실행 가능 처리기입니다.

예외

ArgumentNullException

element 또는 handler가 null인 경우

예제

다음 예에서는 CanExecuteRoutedEventHandler 및 ExecutedRoutedEventHandler 에 연결을 Button 에 대 한 명령 소스는는 Help 명령입니다.

먼저 합니다 Button 만들어지고 연결 된는 Help 명령입니다.

<Button Command="ApplicationCommands.Help"
        Name="helpButton">Help</Button>

다음으로, CanExecuteRoutedEventHandler 및 ExecutedRoutedEventHandler를 만듭니다.

private void HelpCmdExecuted(object sender, ExecutedRoutedEventArgs e)
{
    // OpenHelpFile opens the help file
    OpenHelpFile();
}

Private Sub HelpCmdExecuted(ByVal sender As Object, ByVal e As ExecutedRoutedEventArgs)
    ' OpenHelpFile opens the help file
    OpenHelpFile()
End Sub

private void HelpCmdCanExecute(object sender, CanExecuteRoutedEventArgs e)
{
    // HelpFilesExists() determines if the help file exists
    if (HelpFileExists() == true)
    {
        e.CanExecute = true;
    }
    else
    {
        e.CanExecute = false;
    }
}

Private Sub HelpCmdCanExecute(ByVal sender As Object, ByVal e As CanExecuteRoutedEventArgs)
    ' HelpFilesExists() determines if the help file exists
    If HelpFileExists() = True Then
        e.CanExecute = True
    Else
        e.CanExecute = False
    End If
End Sub

처리기에 연결 된 마지막으로 Button 를 사용 하는 AddCanExecuteHandler 및 AddExecutedHandler합니다.

CommandManager.AddExecutedHandler(helpButton, HelpCmdExecuted);
CommandManager.AddCanExecuteHandler(helpButton, HelpCmdCanExecute);

CommandManager.AddExecutedHandler(helpButton, AddressOf HelpCmdExecuted)
CommandManager.AddCanExecuteHandler(helpButton, AddressOf HelpCmdCanExecute)

추가 정보

• RoutedCommand
• ICommand