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+5RegisterHotKey(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);}
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）#
Copypublic 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;}}
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();}
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
