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KeyEventHandler Delegate

Represents the method that will handle the UIElement.KeyUp and UIElement.KeyDown routed events, as well as related attached and Preview events.

Namespace:  System.Windows.Input
Assembly:  PresentationCore (in PresentationCore.dll)

public delegate void KeyEventHandler(
	Object sender,
	KeyEventArgs e
)
In XAML, you can use delegates but you cannot define your own.

Parameters

sender
Type: System.Object

The object where the event handler is attached.

e
Type: System.Windows.Input.KeyEventArgs

The event data.

This delegate is used with the following attached events:

This delegate is also used with the following routed events on base elements. These routed events forward the previously listed attached events to make them more accessible to the general element model in WPF.

The attached events and the base element routed events share their event data, and the bubbling and tunneling versions of the routed events also share event data. This can affect the handled characteristics of the event as it travels the event route. For details, see Input Overview.

The following example checks whether the key associated with the event is the Return key.

private void OnKeyDownHandler(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Return)
    {
        textBlock1.Text = "You Entered: " + textBox1.Text;
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0

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