C#_注册系统全局快捷键

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using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Runtime.InteropServices;
    
public class HotKeys
{
   int keyid = 10;
   Dictionary<int, HotKeyCallBackHanlder> keymap = new Dictionary<int, HotKeyCallBackHanlder>();
   public  delegate void HotKeyCallBackHanlder();
   public  enum HotkeyModifiers
   {
      Alt = 1,
      Control = 2,
      Shift = 4,
      Win = 8
   }
   [DllImport("user32.dll")]
   static extern bool RegisterHotKey(IntPtr hWnd, int id, int modifiers, Keys vk);

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

   /// <summary> 
   /// 注册快捷键
   /// </summary> 
   /// <param name="hWnd">持有快捷键窗口的句柄</param> 
   /// <param name="fsModifiers">组合键</param> 
   /// <param name="vk">快捷键的虚拟键码</param> 
   /// <param name="callBack">回调函数（按下快捷键时被调用的方法）</param> 
   public void Regist(IntPtr hWnd, int modifiers, Keys vk, HotKeyCallBackHanlder callBack)
   {
       int id = keyid++;
       if (!RegisterHotKey(hWnd, id, modifiers, vk))
           throw new Exception("注册失败！");
       keymap[id] = callBack;
   }

   /// <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  void UnRegist(IntPtr hWnd, HotKeyCallBackHanlder callBack)
   {
      foreach (KeyValuePair<int, HotKeyCallBackHanlder> var in keymap)
      {
         if (var.Value == callBack)
             UnregisterHotKey(hWnd, var.Key);
      }
   }

   /// <summary> 
   /// 快捷键消息处理
   /// </summary> 
   public void ProcessHotKey(Message m)
   {
       if (m.Msg == 0x312)
       {
          int id = m.WParam.ToInt32();
          HotKeyCallBackHanlder callback;
          if (keymap.TryGetValue(id, out callback))
             callback();
       }
   }
}

HotKeys h = new HotKeys();

//窗体登录时注册快捷键
private void Form2_Load(object sender, EventArgs e)
{
   //这里注册了Ctrl+Alt+E 快捷键
   h.Regist(this.Handle, (int)HotKeys.HotkeyModifiers.Control + (int)HotKeys.HotkeyModifiers.Alt, Keys.E, CallBack);
   MessageBox.Show("注册成功");
}

//按钮点击卸载
private void button1_Click(object sender, EventArgs e)
{
   h.UnRegist(this.Handle, CallBack);
   MessageBox.Show("卸载成功");
}

//重载WndProc函数
protected override void WndProc(ref Message m)
{
   h.ProcessHotKey(m);//快捷键消息处理
   base.WndProc(ref m);
}

//按下快捷键时被调用的方法
public  void CallBack()
{
   MessageBox.Show("快捷键被调用！");
}

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