1.调用Win32 API
优先级最高，全局监听， 支持最小化失焦等情况
那么，假如我要在一个WPF程序监听CTRL+5按键，首先在主窗口程序添加以下代码：
/// <summary>
/// CTRL+5事件Id
/// </summary>
private const int Ctrl5KeyEventId = 9000;
[DllImport("user32.dll")]
public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
[DllImport("user32.dll")]
public static extern bool UnregisterHotKey(IntPtr hWnd, int id);
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
var handle = new WindowInteropHelper(this).Handle;
var source = HwndSource.FromHwnd(handle);
source?.AddHook(HwndHook);
//真正注册快捷键监听处理: 同时注册数字键和小键盘的CTRL+5
RegisterHotKey(handle, Ctrl5KeyEventId, (uint)ModifierKeys.Control, (uint)KeyInterop.VirtualKeyFromKey(Key.D5));
RegisterHotKey(handle, Ctrl5KeyEventId, (uint)ModifierKeys.Control, (uint)KeyInterop.VirtualKeyFromKey(Key.NumPad5));
}
private IntPtr HwndHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
const int wmHotkey = 0x0312;
switch (msg)
{
case wmHotkey:
switch (wParam.ToInt32())
{
case Ctrl5KeyEventId:
Debug.WriteLine("Win32监听CTRL+5成功");
break;
}
break;
}
return IntPtr.Zero;
}
protected override void OnClosing(CancelEventArgs e)
{
base.OnClosing(e);
var handle = new WindowInteropHelper(this).Handle;
//关闭窗口后取消注册
UnregisterHotKey(handle, Ctrl5KeyEventId);
}
2.监听WPF的KeyDown事件
不够清真，可选择，最小化失焦等情况监听失效
public MainWindow()
{
InitializeComponent();
KeyDown += MainWindow_KeyDown;
}
private void MainWindow_KeyDown(object sender, KeyEventArgs e)
{
if (Keyboard.Modifiers == ModifierKeys.Control && (e.Key == Key.D5 || e.Key == Key.NumPad5))
{
Debug.WriteLine("WPF的KeyDown事件监听CTRL+5成功"); ;
e.Handled = true;
}
}
3.XAML绑定命令方式
WPF当然优先选中命令绑定啦，清真，最小化失焦等情况监听失效
以下为Window主窗体的XAML代码
<Window.CommandBindings>
<CommandBinding Command="{x:Static local:Commands.Ctrl5Command}" Executed="Ctrl5Command_OnExecuted"/>
</Window.CommandBindings>
<Window.InputBindings>
<KeyBinding Modifiers="Control" Key="D5" Command="{x:Static local:Commands.Ctrl5Command}" />
<KeyBinding Modifiers="Control" Key="NumPad5" Command="{x:Static local:Commands.Ctrl5Command}" />
</Window.InputBindings>在Window主窗体后台代码创建命令对应的Executed方法
private void Ctrl5Command_OnExecuted(object sender, ExecutedRoutedEventArgs e)
{
Debug.WriteLine("WPF的XAML绑定命令监听CTRL+5成功");
}新增命令相关的静态类：
public static class Commands
{
public static ICommand Ctrl5Command { get; } = new RoutedCommand();
}4.细节
三个监听方案的优先级
其中Win32 > XAML绑定命令 = KeyDown事件,假如同时监听的话，其中会只处理高优先级的，以上面的例子，假如
我同时监听三个，只会处理win32的
Win32监听CTRL+5成功
全局监听问题
其中win32支持全局监听键盘，也就是窗口在失焦情况下，例如最小化，也能监听得到，其中XAML绑定命令和KeyDown事件不支持失焦情况，最小化等情况也就监听不到了，因此，要按业务选择方案
5.DEMO
DEMO链接
以上就是WPF实现监听快捷键的方式分享的详细内容，更多关于WPF监听快捷键的资料请关注编程网其它相关文章！
