CommandManager.RemoveCanExecuteHandler 方法

定义

命名空间:

System.Windows.Input

程序集:

PresentationCore.dll

从指定的元素分离指定的 CanExecuteRoutedEventHandler。

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

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

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

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

参数

element

UIElement

要从中移除 handler 的元素。

handler

CanExecuteRoutedEventHandler

可以执行的处理程序。

例外

ArgumentNullException

element 或 handler 为 null。

示例

以下示例分离CanExecuteRoutedEventHandler之前已附加到 的 Button和 ExecutedRoutedEventHandler 。

CommandManager.RemoveExecutedHandler(helpButton, HelpCmdExecuted);
CommandManager.RemoveCanExecuteHandler(helpButton, HelpCmdCanExecute);

CommandManager.RemoveExecutedHandler(helpButton, AddressOf HelpCmdExecuted)
CommandManager.RemoveCanExecuteHandler(helpButton, AddressOf HelpCmdCanExecute)

另请参阅

• RoutedCommand
• ICommand