C＃WPF窗口上的KeyDown事件不工作

Question

我試圖在窗口（不是窗體）中接收關鍵筆劃。我收到事件，直到按下按鈕。之後，無論我做什麼，關鍵事件都不會再發生。有沒有解決方法？我已經尋找了，好像每個人都在暗示使用

this.KeyPreview = true; 

的解決方案，但這不能在這裏工作，因爲窗口沒有這樣的屬性。非常感謝。我已經將所有兒童的焦點設置爲假，並且窗口設置爲可對焦。但是這並沒有幫助。

的XAML是

<Window x:Class="WpfApplication1.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="MainWindow" Height="463" Width="726" AllowsTransparency="False" PreviewKeyDown="Window_PreviewKeyDown" KeyDown="Window_KeyDown_1" WindowStartupLocation="CenterScreen" Focusable="True"> 
    <Window.Background> 
     <RadialGradientBrush> 
      <GradientStop Color="#FF3EB5FF" Offset="1" /> 
      <GradientStop Color="White" Offset="0" /> 
     </RadialGradientBrush> 
    </Window.Background> 
    <Grid Name="grid1"> 
     <Grid.ColumnDefinitions> 
      <ColumnDefinition Width="434*" /> 
      <ColumnDefinition Width="270*" /> 
     </Grid.ColumnDefinitions> 
     <Grid Margin="10,10,0,12" Name="EquiGrid" Focusable="False"> 
      <Grid.ColumnDefinitions> 
       <ColumnDefinition Width="2*" /> 
       <ColumnDefinition Width="198*" /> 
      </Grid.ColumnDefinitions> 
      <Image Grid.ColumnSpan="2" Name="EquiImage" Stretch="Uniform" Margin="0,0,0,6" /> 
      <Grid Grid.Column="1" Height="100" HorizontalAlignment="Left" Margin="489,90,0,0" Name="grid2" VerticalAlignment="Top" Width="200" /> 
     </Grid> 
     <Label Content="Label" Height="28" Margin="14,12,12,0" Name="longLabel" VerticalAlignment="Top" Grid.Column="1" OpacityMask="White" BorderBrush="Red" Focusable="False"> 
      <Label.Background> 
       <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> 
        <GradientStop Color="White" Offset="0.025" /> 
        <GradientStop Color="#FFDBDBDB" Offset="1" /> 
       </LinearGradientBrush> 
      </Label.Background> 
     </Label> 
     <Label Content="Label" Height="28" Margin="14,46,12,0" Name="latLabel" VerticalAlignment="Top" Grid.Column="1" Focusable="False"> 
      <Label.Background> 
       <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> 
        <GradientStop Color="White" Offset="0.025" /> 
        <GradientStop Color="#FFDBDBDB" Offset="1" /> 
       </LinearGradientBrush> 
      </Label.Background> 
     </Label> 
     <TextBlock Margin="14,80,12,54" Name="descriptionText" Padding="10" Text="" Grid.Column="1" Focusable="False"><TextBlock.Background><LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"><GradientStop Color="White" Offset="0.025" /><GradientStop Color="#FFDBDBDB" Offset="1" /></LinearGradientBrush></TextBlock.Background></TextBlock> 
     <Button Content="Load Image" Grid.Column="1" Margin="14,0,0,12" Name="button1" Height="36" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="124" Click="button1_Click" Focusable="False" /> 
     <Button Content="Load XML" Grid.Column="1" Margin="0,0,12,12" Name="button2" Height="36" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="114" Click="button2_Click" Focusable="False" /> 
    </Grid> 
</Window> 

和處理程序：

private void Window_KeyDown_1(object sender, System.Windows.Input.KeyEventArgs e) 
{ 
     Console.WriteLine("k"); 
} 

我還發現，這個問題是焦點。儘管孩子們不會集中注意力，但他們把注意力集中在窗戶上，並停止了事件發生。

Answer 1

嘗試使用KeyDown事件。

在代碼隱藏

public partial class MainWindow : Window 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 
    } 
    private void Window_KeyDown(object sender, KeyEventArgs e) 
    { 
     System.Diagnostics.Debug.WriteLine("KeyDown"); 
     System.Diagnostics.Debug.WriteLine(e.Key); 
    } 

    private void Window_PreviewKeyDown(object sender, KeyEventArgs e) 
    { 
     System.Diagnostics.Debug.WriteLine("PreviewKeyDown"); 
     System.Diagnostics.Debug.WriteLine(e.Key); 
    } 

    private void Button_Click(object sender, RoutedEventArgs e) 
    { 
     System.Diagnostics.Debug.WriteLine("Button clicked"); 
    } 
} 

XAML

<Window x:Class="WpfApplication1.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="MainWindow" Height="350" Width="525" KeyDown="Window_KeyDown" PreviewKeyDown="Window_PreviewKeyDown"> 
    <Grid> 
     <Grid.RowDefinitions> 
      <RowDefinition></RowDefinition> 
      <RowDefinition></RowDefinition> 
     </Grid.RowDefinitions> 
     <TextBox Grid.Row="0"></TextBox> 
     <Button Grid.Row="1" Content="Click me!" Click="Button_Click"></Button> 
    </Grid> 
</Window>