WPF中TextBox的PreviewMouseLeftButtonUp事件

 1 <Window x:Class="learnwpf.MainWindow"
 2         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4         Title="MainWindow" Height="350" Width="525">
 5     <Grid>
 6         <ListBox>
 7             <TextBox x:Name="textbox" PreviewMouseLeftButtonUp="textbox_PreviewMouseLeftButtonUp" Text="测试文本" Width="150" Height="30"/>
 8             <Button x:Name="btn" Click="btn_Click" Width="100" Height="30" />
 9         </ListBox>
10     </Grid>
11 </Window>

 1 using System.Windows;
 2 using System.Windows.Controls;
 3 using System.Windows.Input;
 4 
 5 namespace learnwpf
 6 {
 7     /// <summary>
 8     /// Interaction logic for MainWindow.xaml
 9     /// </summary>
10     public partial class MainWindow : Window
11     {
12         public MainWindow()
13         {
14             InitializeComponent();
15         }
16 
17         private void btn_Click(object sender, RoutedEventArgs e)
18         {
19             MessageBox.Show("Button‘s clicked");
20         }
21 
22         private void textbox_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
23         {
24             textbox.Text = string.Empty;
25             e.Handled = true;
26             // 移除TextBox对鼠标的捕获
27             ((TextBox)textbox).ReleaseMouseCapture();
28         }
29     }
30 }