CommandManager.AddExecutedHandler 方法

参考

定义

命名空间:: System.Windows.Input

程序集:: PresentationCore.dll

重要

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将指定的 ExecutedRoutedEventHandler 附加到指定的元素。

public:
 static void AddExecutedHandler(System::Windows::UIElement ^ element, System::Windows::Input::ExecutedRoutedEventHandler ^ handler);

public static void AddExecutedHandler (System.Windows.UIElement element, System.Windows.Input.ExecutedRoutedEventHandler handler);

static member AddExecutedHandler : System.Windows.UIElement * System.Windows.Input.ExecutedRoutedEventHandler -> unit

Public Shared Sub AddExecutedHandler (element As UIElement, handler As ExecutedRoutedEventHandler)

参数

element: UIElement

要向其附加 handler 的元素。

handler: ExecutedRoutedEventHandler

执行的处理程序。

例外

ArgumentNullException

element 或 handler 为 null。

示例

以下示例创建 CanExecuteRoutedEventHandler 和， ExecutedRoutedEventHandler 并将其附加到 Button 作为命令源的 Help 。

首先， Button 创建并与命令关联 Help 。

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

接下来，创建 CanExecuteRoutedEventHandler 和 ExecutedRoutedEventHandler。

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

最后，使用 AddCanExecuteHandler 和 AddExecutedHandler将处理程序附加到 Button 。

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

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

适用于

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通过

CommandManager.AddExecutedHandler 方法

定义

参数

例外

示例

适用于

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