WPF 中的全局热键可在每个窗口中使用

在WPF中，全局热键是一种非常有用的功能，它允许在应用程序的任何窗口中注册和处理特定的按键组合。通过使用全局热键，用户可以定义自定义的快捷键，以便在应用程序中执行特定的操作。这对于提高用户体验和提高应用程序的易用性非常重要。

csharp
using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Input;
using System.Windows.Interop;
namespace GlobalHotkeyDemo
{
    public partial class MainWindow : Window
    {
        private const int HOTKEY_ID = 9000;
        private const int MOD_CONTROL = 0x0002;
        [DllImport("user32.dll", SetLastError = true)]
        private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk);
        [DllImport("user32.dll", SetLastError = true)]
        private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
        public MainWindow()
        {
            InitializeComponent();
        }
        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);
            IntPtr hWnd = new WindowInteropHelper(this).Handle;
            HwndSource source = HwndSource.FromHwnd(hWnd);
            source.AddHook(HwndHook);
            RegisterHotKey(hWnd, HOTKEY_ID, MOD_CONTROL, KeyInterop.VirtualKeyFromKey(Key.A));
        }
        protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);
            IntPtr hWnd = new WindowInteropHelper(this).Handle;
            UnregisterHotKey(hWnd, HOTKEY_ID);
        }
        private IntPtr HwndHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            const int WM_HOTKEY = 0x0312;
            switch (msg)
            {
                case WM_HOTKEY:
                    if (wParam.ToInt32() == HOTKEY_ID)
                    {
                        // 热键被触发，执行相应的操作
                        MessageBox.Show("热键被触发！");
                    }
                    handled = true;
                    break;
            }
            return IntPtr.Zero;
        }
    }
}