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KeyStates Enumeration
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KeyStates Enumeration

Specifies constants that define the state of a key.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

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

[FlagsAttribute]
public enum KeyStates
<object property="enumerationMemberName" .../>

Member nameDescription
NoneThe key is not pressed.
DownThe key is pressed.
ToggledThe key is toggled.

The KeyStates class is a bit field (flagwise) enumeration. Therefore, a key can be in multiple states. For example, a key could be in the Down state as well as in the Toggled state. Use bit operations to determine the exact state or states the key is in.

The following example changes the color of a Button if the KeyStates of the key passed in the KeyEventArgs is Down. The state of the key is determined by using a bitwise AND operation. The same technique can be used to determine whether a key has multiple states, such as being in the Toggled state and the Down state.

// A bitwise AND operation is used in the comparison. 
// e is an instance of KeyEventArgs. 
// btnDown is a Button. 
if ((e.KeyStates & KeyStates.Down) > 0)
{
    btnDown.Background = Brushes.Red;
}

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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