Keyboard.KeyDown Keyboard.KeyDown Keyboard.KeyDown Attached Event

定義

按下鍵盤上的按鍵時發生。Occurs when a key on the keyboard is pressed.

see AddKeyDownHandler, and RemoveKeyDownHandler
see AddKeyDownHandler, and RemoveKeyDownHandler
see AddKeyDownHandler, and RemoveKeyDownHandler

範例

下列範例會建立TextBox,將附加事件處理常式KeyDown事件。The following example creates TextBox that attaches an event handler for the KeyDown event. Return按下時,事件處理常式會顯示在文字TextBoxTextBlockWhen the Return is pressed, the event handler displays the text in the TextBox in a TextBlock.

<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>
private void OnKeyDownHandler(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Return)
    {
        textBlock1.Text = "You Entered: " + textBox1.Text;
    }
}
Private Sub OnKeyDownHandler(ByVal sender As Object, ByVal e As KeyEventArgs)
    If (e.Key = Key.Return) Then
        textBlock1.Text = "You Entered: " + textBox1.Text
    End If
End Sub

備註

這是附加的事件。This is an attached event. WPFWPF 將附加的事件實作為路由事件。implements attached events as routed events. 附加的事件基本上都XAMLXAML參考可以處理不會定義事件的物件的事件的語言概念的WPFWPF展開時也能周遊路由事件。Attached events are fundamentally a XAMLXAML language concept for referencing events that can be handled on objects that do not define that event, which WPFWPF expands upon by also enabling the event to traverse a route. 附加的事件並沒有直接處理語法在程式碼若要附加的程式碼中的路由事件處理常式,您會使用指定的新增 * 處理常式方法。Attached events do not have a direct handling syntax in code; to attach handlers for a routed event in code, you use a designated Add*Handler method. 如需詳細資訊,請參閱 < 附加事件概觀For details, see Attached Events Overview.

路由事件資訊Routed Event Information

識別項欄位Identifier field KeyDownEvent
路由策略Routing strategy 事件反昇Bubbling
Delegate - 委派Delegate KeyEventHandler

適用於

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