C# WPF 窗口上的 KeyDown 事件不起作用

Question

我正在尝试在窗口（不是表单）中接收击键。我收到事件，直到按下按钮。之后，无论我做什么，按键事件都不会再触发。有什么解决办法吗？我已经搜索过了，似乎每个人都在建议使用

的解决方案

this.KeyPreview = true;

但这在这里不起作用，因为 Window 没有这样的属性。非常有帮助，非常感谢。我已经将所有子项 Focusable 设置为 False，并将 Window 设置为可聚焦。但这并没有帮助。

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>

和处理程序：

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

我也发现问题出在焦点上。孩子们虽然设置为不可聚焦，但会窃取窗口的焦点并停止事件触发。

Answer 1

尝试使用 KeyDown 事件。

在代码隐藏中

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>

Answer 2

您需要在WPF中实现全局事件。无论当前处于焦点或选择哪个控件，这都有效。

https://blog.magnusmontin.net/2015/03/31/implementing-global-hot-keys-in-wpf/