CommandManager.AddExecutedHandler Metode
Definisi
Penting
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Melampirkan yang ditentukan ExecutedRoutedEventHandler ke elemen yang ditentukan.
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)
Parameter
- element
- UIElement
Elemen yang akan dilampirkan handler
.
- handler
- ExecutedRoutedEventHandler
Handler yang dijalankan.
Pengecualian
element
atau handler
adalah null
.
Contoh
Contoh berikut membuat CanExecuteRoutedEventHandler dan ExecutedRoutedEventHandler dan melampirkannya ke yang Button merupakan sumber perintah untuk Help perintah.
Pertama, Button dibuat dan dikaitkan dengan Help perintah .
<Button Command="ApplicationCommands.Help"
Name="helpButton">Help</Button>
Selanjutnya, CanExecuteRoutedEventHandler dan ExecutedRoutedEventHandler dibuat.
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
Dan akhirnya, handler dilampirkan ke Button menggunakan AddCanExecuteHandler dan AddExecutedHandler.
CommandManager.AddExecutedHandler(helpButton, HelpCmdExecuted);
CommandManager.AddCanExecuteHandler(helpButton, HelpCmdCanExecute);
CommandManager.AddExecutedHandler(helpButton, AddressOf HelpCmdExecuted)
CommandManager.AddCanExecuteHandler(helpButton, AddressOf HelpCmdCanExecute)