WPF里如何实现全局快捷键？具体方法是什么？

今天写一个小程序中使用到了全局快捷键，找到了我之前写的文章在c#中使用全局快捷键翻了一下，发现它是WinForm版本的，而我现在大部分写WPF程序了，便将其翻译了为WPF版本的了。

    static class Hotkey
    {
    
        #region 系统api
        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool RegisterHotKey(IntPtr hWnd, int id, HotkeyModifiers fsModifiers, uint vk);
    

        [DllImport("user32.dll")]
        static extern bool UnregisterHotKey(IntPtr hWnd, int id);
    
        #endregion

        /// summary>
    
        /// 注册快捷键
        /// /summary>
    
        /// param name="window">
    持有快捷键窗口/param>
    
        /// param name="fsModifiers">
    组合键/param>
    
        /// param name="key">
    快捷键/param>
    
        /// param name="callBack">
    回调函数/param>

        public static void Regist(Window window, HotkeyModifiers fsModifiers, Key key, HotKeyCallBackHanlder callBack)
        {
    
            var hwnd = new WindowInteropHelper(window).Handle;
    
            var _hwndSource = HwndSource.FromHwnd(hwnd);
    
            _hwndSource.AddHook(WndProc);
    

            int id = keyid++;
    

            var vk = KeyInterop.VirtualKeyFromKey(key);
    
            if (!RegisterHotKey(hwnd, id, fsModifiers, (uint)vk))
                throw new Exception("regist hotkey fail.");
    
            keymap[id] = callBack;

        }
    

        /// summary>
    
        /// 快捷键消息处理
        /// /summary>

        static IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {

            if (msg == WM_HOTKEY)
            {
    
                int id = wParam.ToInt32();

                if (keymap.TryGetValue(id, out var callback))
                {
    
                    callback();

                }

            }
    
            return IntPtr.Zero;

        }
    

        /// summary>
    
        /// 注销快捷键
        /// /summary>
    
        /// param name="hWnd">
    持有快捷键窗口的句柄/param>
    
        /// param name="callBack">
    回调函数/param>

        public static void UnRegist(IntPtr hWnd, HotKeyCallBackHanlder callBack)
        {
    
            foreach (KeyValuePairint, HotKeyCallBackHanlder>
 var in keymap)
            {
    
                if (var.Value == callBack)
                    UnregisterHotKey(hWnd, var.Key);

            }

        }
    


        const int WM_HOTKEY = 0x312;
    
        static int keyid = 10;
    
        static Dictionaryint, HotKeyCallBackHanlder>
     keymap = new Dictionaryint, HotKeyCallBackHanlder>
    ();
    

        public delegate void HotKeyCallBackHanlder();

    }


    enum HotkeyModifiers
    {

        MOD_ALT = 0x1,
        MOD_CONTROL = 0x2,
        MOD_SHIFT = 0x4,
        MOD_WIN = 0x8
    }

代码仍然差不多，使用的方式更加简单一点：

protected override void OnSourceInitialized(EventArgs e)
{
    
    Hotkey.Regist(this, HotkeyModifiers.MOD_ALT, Key.T, () =>

    {
    
        MessageBox.Show("hello");

    }
    );
    

    _context = new MainContext();
    
    this.DataContext = _context;
    
    _context.Process();

}
    

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