wpf程序热键的一个类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Interop;

namespace WpfHotKey
{
    public class HotKeyHelper
    {

        /// <summary>
        /// 如果函数执行成功，返回值不为0。
        /// 如果函数执行失败，返回值为0。要得到扩展错误信息，调用GetLastError。.NET方法:Marshal.GetLastWin32Error()
        /// </summary>
        /// <param name="hWnd">要定义热键的窗口的句柄</param>
        /// <param name="id">定义热键ID（不能与其它ID重复）  </param>
        /// <param name="fsModifiers">标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效</param>
        /// <param name="vk">定义热键的内容,WinForm中可以使用Keys枚举转换，
        /// WPF中Key枚举是不正确的,应该使用System.Windows.Forms.Keys枚举，或者自定义正确的枚举或int常量</param>
        /// <returns></returns>
        [DllImport("user32.dll", SetLastError = true)]
        static extern bool RegisterHotKey(
            IntPtr hWnd,
            int id,
            KeyModifiers fsModifiers,
            int vk
            );

        /// <summary>
        /// 取消注册热键
        /// </summary>
        /// <param name="hWnd">要取消热键的窗口的句柄</param>
        /// <param name="id">要取消热键的ID</param>
        /// <returns></returns>
        [DllImport("user32.dll", SetLastError = true)]
        static extern bool UnregisterHotKey(
            IntPtr hWnd,
            int id
            );

        /// <summary>
        /// 向全局原子表添加一个字符串，并返回这个字符串的唯一标识符,成功则返回值为新创建的原子ID,失败返回0
        /// </summary>
        /// <param name="lpString"></param>
        /// <returns></returns>
        [DllImport("kernel32", SetLastError = true)]
        static extern short GlobalAddAtom(string lpString);

        [DllImport("kernel32", SetLastError = true)]
        static extern short GlobalDeleteAtom(short nAtom);

        /// <summary>
        /// 定义了辅助键的名称（将数字转变为字符以便于记忆，也可去除此枚举而直接使用数值）
        /// </summary>
        [Flags()]
        public enum KeyModifiers
        {
            None = 0,
            Alt = 1,
            Ctrl = 2,
            Shift = 4,
            WindowsKey = 8
        }
        /// <summary>
        /// 热键的对应的消息ID
        /// </summary>
        public const int WM_HOTKEY = 0x312;
        static Dictionary<int, Action> keymap = new Dictionary<int, Action>();   //每一个key对于一个处理函数

        /// <summary>
        /// 注册快捷键
        /// </summary>
        /// <param name="window">主体窗体</param>
        /// <param name="action">回调的方法</param>
        /// <returns>热键的标识</returns>
        public static void Regist(Window window, Action action)
        {
            HwndSource hWndSource;
            WindowInteropHelper wih = new WindowInteropHelper(window);
            hWndSource = HwndSource.FromHwnd(wih.Handle);
            //添加处理程序
            hWndSource.AddHook(MainWindowProc);
            int KeyCodes = -1;
            if (!RegisterHotKey(wih.Handle, KeyCodes, HotKeyHelper.KeyModifiers.Ctrl, (int)Keys.S))
            {
                throw new Exception("注册失败");
            }
            else
            {
                if (keymap.Where(p => p.Key == KeyCodes).Count() > 0)
                    throw new Exception("注册失败,应为这个组合键已经注册！！");
                else
                {
                    keymap.Add(KeyCodes, action);
                }
            }
        }
        /// <summary>
        /// 卸载快捷键
        /// </summary>
        /// <param name="window">主体窗体</param>
        /// <param name="callBack">注册时回调的方法</param>
        public static void UnRegist(Window window, Action callBack)
        {
            foreach (KeyValuePair<int, Action> var in keymap)
            {
                WindowInteropHelper wih = new WindowInteropHelper(window);
                if (var.Value == callBack)
                {
                    UnregisterHotKey(wih.Handle, var.Key);
                    keymap.Remove(var.Key);
                    return;
                }
            }
        }

        private static IntPtr MainWindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            switch (msg)
            {
                case HotKeyHelper.WM_HOTKEY:
                    {
                        int sid = wParam.ToInt32();
                        if (keymap.Where(p => p.Key == sid).Count() > 0)
                        {
                            keymap.Where(p => p.Key == sid).FirstOrDefault().Value.Invoke();
                        }
                        handled = true;
                        break;
                    }
            }
            return IntPtr.Zero;
        }
    }
}