通过一个demo来了解键盘事件 设计代码
代码语言：javascript复制<Window x:Class="keyboard.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="397" Width="360">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<DockPanel>
<TextBlock Margin="3" >
Type here:
</TextBlock>
<TextBox Name="TextBox" PreviewKeyDown="KeyEvent" KeyDown="KeyEvent" PreviewTextInput="TextBox_PreviewTextInput" PreviewKeyUp="KeyEvent" KeyUp="KeyEvent" TextChanged="TextBox_TextChanged" ></TextBox>
</DockPanel>
<ListBox Grid.Row="1" Name="listMessage" Margin="5" />
<Button Grid.Row="2" HorizontalAlignment="Right" Padding="3" Margin="5" Click="Button_Click">Clear List</Button>
</Grid>
</Window>逻辑代码
代码语言：javascript复制using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace keyboard
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void KeyEvent(object sender, KeyEventArgs e)
{
string message = "Event:" e.RoutedEvent " " "Key:" e.Key;
this.listMessage.Items.Add(message);
}
private void TextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
string message = "Event:" e.RoutedEvent " " "Text:" e.Text;
this.listMessage.Items.Add(message);
}
private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
{
string message = "Event:" e.RoutedEvent " " "Text:" e.Changes;
this.listMessage.Items.Add(message);
}
private void Button_Click(object sender, RoutedEventArgs e)
{
this.TextBox.Text = "";
this.listMessage.Items.Clear();
}
}
}当在定义的TextBox输入K时，显示如下
这里写图片描述
