Assembly: PresentationCore (in presentationcore.dll)
XML Namespace: http://schemas.microsoft.com/winfx/2006/xaml/presentation
KeyEventArgs is used with the following events: KeyUp, KeyDown, and the corresponding tunneling events.
A key can be in both the up and toggled states or the down and toggled states. For this reason, determining whether a key is up or down is not as simple as checking the KeyStates value as a numeric value. Instead, you should check the value by treating it as a flag enumeration. Use an AND comparison of the first bit. Alternatively, use the helper properties IsUp, IsDown, and IsToggled to determine whether a given key is up, down, or toggled.
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.
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.