Assembly: PresentationCore (in presentationcore.dll)
XML Namespace: http://schemas.microsoft.com/winfx/2006/xaml/presentation
/** @event */ public final void add_KeyDown (KeyEventHandler value) /** @event */ public final void remove_KeyDown (KeyEventHandler value)
In JScript, you can handle the events defined by a class, but you cannot define your own.
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.KeyDown attached event for this class so that KeyDown is part of the class members list when UIElement is inherited as a base element. Event handlers that are attached to the KeyDown event are attached to the underlying Keyboard.KeyDown attached event and receive the same event data instance.
This example shows how to detect when the Enter key is pressed on the keyboard.
This example consists of a Extensible Application Markup Language (XAML) file and a code-behind file. For the complete samples, see Keyboard Key Sample.
When the user presses the Enter key in the TextBox, the input in the text box appears in another area of the user interface (UI).
<StackPanel> <TextBlock Width="300" Height="20"> Type some text into the TextBox and press the Enter key. </TextBlock> <TextBox Width="300" Height="30" Name="textBox1" KeyDown="OnKeyDownHandler"/> <TextBlock Width="300" Height="100" Name="textBlock1"/> </StackPanel>
The following code behind creates the KeyDown event handler. If the key that is pressed is the Enter key, a message is displayed in the TextBlock.