Keyboard.IsKeyDown(Key) 方法

定义

命名空间:

System.Windows.Input

程序集:

PresentationCore.dll

确定指定的键是否处于按下状态。

public:
 static bool IsKeyDown(System::Windows::Input::Key key);

public static bool IsKeyDown (System.Windows.Input.Key key);

static member IsKeyDown : System.Windows.Input.Key -> bool

Public Shared Function IsKeyDown (key As Key) As Boolean

参数

key

Key

指定的键。

返回

Boolean

如果 key 处于按下状态，则为 true；否则为 false。

示例

以下示例演示如何使用 IsKeyDown 方法确定特定键的状态。 密钥 Return 将传递给 IsKeyDown 方法。 如果方法返回 true，则会更改 的背景 Button 。

// Uses the Keyboard.IsKeyDown to determine if a key is down.
// e is an instance of KeyEventArgs.
if (Keyboard.IsKeyDown(Key.Return))
{
    btnIsDown.Background = Brushes.Red;
}
else
{
    btnIsDown.Background = Brushes.AliceBlue;
}

' Uses the Keyboard.IsKeyDown to determine if a key is down.
' e is an instance of KeyEventArgs.
If Keyboard.IsKeyDown(Key.Return) Then
    btnIsDown.Background = Brushes.Red
Else
    btnIsDown.Background = Brushes.AliceBlue
End If

注解

方法 GetKeyStates 可用于确定特定键的状态集。

另请参阅

• KeyEventArgs
• IsDown