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Keyboard.IsKeyUp Method

Determines whether the specified key is released.

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

public static bool IsKeyUp(
	Key key


Type: System.Windows.Input.Key
The key to check.

Return Value

Type: System.Boolean
true if key is in the up state; otherwise, false.

The GetKeyStates method can be used to determine the set of states of a specific key.

The following example shows how to use the IsKeyUp method to determine the state of a specific key. The Return key is passed to the IsKeyUp method. If the method returns true, then the background of a Button is changed.

// Uses the Keyboard.IsKeyUp to determine if a key is up.
if (Keyboard.IsKeyUp(Key.Return))
    btnIsUp.Background = Brushes.Red;
    btnIsUp.Background = Brushes.AliceBlue;

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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