CommandManager.RemovePreviewCanExecuteHandler 方法

定义

命名空间:
System.Windows.Input
程序集:
PresentationCore.dll

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

public:
 static void RemovePreviewCanExecuteHandler(System::Windows::UIElement ^ element, System::Windows::Input::CanExecuteRoutedEventHandler ^ handler);
public static void RemovePreviewCanExecuteHandler(System.Windows.UIElement element, System.Windows.Input.CanExecuteRoutedEventHandler handler);
static member RemovePreviewCanExecuteHandler : System.Windows.UIElement * System.Windows.Input.CanExecuteRoutedEventHandler -> unit
Public Shared Sub RemovePreviewCanExecuteHandler (element As UIElement, handler As CanExecuteRoutedEventHandler)

参数

element
UIElement

要从中删除 handler 的元素。

handler
CanExecuteRoutedEventHandler

可以执行处理程序。

例外

ArgumentNullException

element 或 handler 为 null.

示例

下面的示例分离了以前附加到 a 的 a CanExecuteRoutedEventHandler 和 aExecutedRoutedEventHandler。Button

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

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

适用于

另请参阅