WPF 注册全局快捷键

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Interop;
using System.Collections;


/// <summary>
/// 直接构造类实例即可注册
/// 自动完成注销
/// 注意注册时会抛出异常
/// </summary>
public class HotKey
//注册系统热键类
//热键会随着程序结束自动解除,不会写入注册表
{
    #region Member

    int KeyId;         //热键编号
    IntPtr Handle;     //窗体句柄
    Window window;     //热键所在窗体
    uint Controlkey;   //热键控制键
    uint Key;          //热键主键

    public delegate void OnHotkeyEventHandeler();     //热键事件委托
    public event OnHotkeyEventHandeler OnHotKey = null;   //热键事件    

    static Hashtable KeyPair = new Hashtable();         //热键哈希表

    private const int WM_HOTKEY = 0x0312;       // 热键消息编号

    public enum KeyFlags    //控制键编码
    {
        MOD_ALT = 0x1,
        MOD_CONTROL = 0x2,
        MOD_SHIFT = 0x4,
        MOD_WIN = 0x8,
        MOD_CONTROLALT = 0x2 + 0x1
    }

    #endregion

    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="win">注册窗体</param>
    /// <param name="control">控制键</param>
    /// <param name="key">主键</param>
    public HotKey(Window win, HotKey.KeyFlags control, Keys key)
    //构造函数,注册热键
    {

        Handle = new WindowInteropHelper(win).Handle;
        window = win;
        Controlkey = (uint)control;
        Key = (uint)key;
        KeyId = (int)Controlkey + (int)Key * 10;
        if (HotKey.KeyPair.ContainsKey(KeyId))
        {
            throw new Exception("热键已经被注册!");
        }

        //注册热键
        if (false == HotKey.RegisterHotKey(Handle, KeyId, Controlkey, Key))
        {
            throw new Exception("热键注册失败!");
        }
        if (HotKey.KeyPair.Count == 0)
        {
            //消息挂钩只能连接一次!!
            if (false == InstallHotKeyHook(this))
            {
                throw new Exception("消息挂钩连接失败!");
            }
        }

        //添加这个热键索引
        HotKey.KeyPair.Add(KeyId, this);

    }

    #region core

    [System.Runtime.InteropServices.DllImport("user32")]
    private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint controlKey, uint virtualKey);

    [System.Runtime.InteropServices.DllImport("user32")]
    private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

    static private bool InstallHotKeyHook(HotKey hk)
    //安装热键处理挂钩
    {
        if (hk.window == null || hk.Handle == IntPtr.Zero)
            return false;

        //获得消息源
        System.Windows.Interop.HwndSource source = System.Windows.Interop.HwndSource.FromHwnd(hk.Handle);
        if (source == null) return false;

        //挂接事件
        source.AddHook(HotKey.HotKeyHook);
        return true;
    }

    static private IntPtr HotKeyHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    //热键处理过程
    {
        if (msg == WM_HOTKEY)
        {
            HotKey hk = (HotKey)HotKey.KeyPair[(int)wParam];
            if (hk.OnHotKey != null) hk.OnHotKey();
        }
        return IntPtr.Zero;
    }

    ~HotKey()
    //析构函数,解除热键
    {
        HotKey.UnregisterHotKey(Handle, KeyId);
    }

    #endregion
}

调用：

 1     private void MainWindow_OnLoaded(object sender, RoutedEventArgs e)
 2         {
 3            HotKey hot = new HotKey(this,HotKey.KeyFlags.MOD_CONTROLALT,Keys.M);
 4            hot.OnHotKey += hot_OnHotKey;
 5         }
 6 
 7         void hot_OnHotKey()
 8         {
 9             MessageBox.Show("我是按ctrl+alt+m 进来的!");
10         }