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UIElement.PreviewKeyDown, événement

Occurs when a key is pressed while the keyboard is focused on this element.

Espace de noms: System.Windows
Assembly : PresentationCore (dans presentationcore.dll)
Espace de noms XML :  http://schemas.microsoft.com/winfx/2006/xaml/presentation

public event KeyEventHandler PreviewKeyDown
/** @event */
public final void add_PreviewKeyDown (KeyEventHandler value)

/** @event */
public final void remove_PreviewKeyDown (KeyEventHandler value)

En JScript, vous pouvez gérer les événements définis par une classe, mais vous ne pouvez pas définir les vôtres.
<object PreviewKeyDown="KeyEventHandler" .../>

Identifier field

PreviewKeyDownEvent

Routing strategy

Tunneling

Delegate

KeyEventHandler

  • The corresponding bubbling event is KeyDown.

  • Override OnPreviewKeyDown to implement class handling for this event in derived classes.

Key handling interacts with other platform features such as commanding and text composition. Key handling interacts with other platform features such as commanding and text composition. The KeyDown event is a lower-level text input event that might not behave as expected on certain controls. This is because some controls have control compositing or class handling that provides a higher-level version of text input handling and related events.

This event creates an alias for the Keyboard.PreviewKeyDown attached event for this class, so that PreviewKeyDown is part of the class members list when UIElement is inherited as a base element. Event handlers that are attached to the PreviewKeyDown event are attached to the underlying Keyboard.PreviewKeyDown attached event and receive the same event data instance.

Microsoft .NET Framework 3.0 est pris en charge sur Windows Vista, Microsoft Windows XP SP2 et Windows Server 2003 SP1.

.NET Framework

Prise en charge dans : 3.0
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