Question

TextBlock有KeyDown和KeyUp事件，但它永远不会被触发。有没有办法让它成真？我只需要检测是否按下任何键。

Answer 1

首先，您需要将TextBlock的Focusable属性设置为True，这将允许您Tab键到项目而不是单击以选择它，但如果您处理MouseDown事件，您可以手动将焦点设置为TextBlock。

<强> MainWindow.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">
    <Grid >
       <TextBlock Name="tb1"  Height="30" Width ="100" IsEnabled="True"  Focusable="True" KeyDown="tb1_KeyDown" MouseDown="tb1_MouseDown">Hello World</TextBlock>
    </Grid>
</Window>

<强> MainWindow.xaml.cs

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void tb1_KeyDown(object sender, KeyEventArgs e)
    {
        tb1.Background = Brushes.Blue;
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        tb1.Focus();
    }

    private void tb1_MouseDown(object sender, MouseButtonEventArgs e)
    {
        tb1.Focus();
    }
}

WPF：如何制作文本块fire key事件？

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