做了个C#的Hotkey简单封装，希望对大家有帮助

本来听说winapi里面的RegisterHotKey有时候不好使，于是打算用hook键盘消息来做hook key，结果发现hook那里处理消息那里还挺麻烦，也想会不会造成系统的额外开销比较大，所以最后用RegisterHotKey来封装了一下，测试没有问题，还是可以的。（winform）
下面的代码包括一个Textbox的处理，和一个封装了api的类。Textbox那里就是处理用户定义的热键的界面表示，比如用户按键的时候会出现"Ctrl+Alt+A"之类的，Api封装那里做了处理，只管Register好了，不用管UnRegister，当注册一个一样的Id的hotkey，会自动先UnRegister原来的，然后最后关闭窗口的时候，调用一下HotkeyHelper.Dispose()就可以了。还希望多加建议。here we go..

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Textbox部分：(Key hotkeyVk = null;)

        private void txbHotKey_KeyDown(object sender, KeyEventArgs e)
        {
            txbHotKey.Text = string.Empty;

            if (e.Control)
            {
                txbHotKey.Text += "Ctrl+";
            }
            if (e.Alt)
            {
                txbHotKey.Text += "Alt+";
            }
            if (e.Shift)
            {
                txbHotKey.Text += "Shift+";
            }

            if (e.KeyCode >= Keys.A && e.KeyCode <= Keys.Z)
            {
                if (e.Modifiers != Keys.None)
                {
                    txbHotKey.Text += e.KeyCode.ToString();
                    hotkeyVk = e.KeyCode;
                }
            }
            else if (e.KeyCode >= Keys.D0 && e.KeyCode <= Keys.D9)
            {
                if (e.Modifiers != Keys.None)
                {
                    txbHotKey.Text += e.KeyCode.ToString().Remove(0, 1);
                    hotkeyVk = e.KeyCode;
                }
            }
            else if (e.KeyCode >= Keys.NumPad0 && e.KeyCode <= Keys.NumPad9)
            {
                if (e.Modifiers != Keys.None)
                {
                    txbHotKey.Text += e.KeyCode.ToString().Replace("Pad", "");
                    hotkeyVk = e.KeyCode;
                }
            }
            else if (e.KeyCode >= Keys.F1 && e.KeyCode <= Keys.F12)
            {
                txbHotKey.Text += e.KeyCode.ToString();
                hotkeyVk = e.KeyCode;
            }

            e.SuppressKeyPress = false;
            e.Handled = true;
        }

        private void txbHotKey_KeyPress(object sender, KeyPressEventArgs e)
        {
            e.Handled = true;
        }

        private void txbHotKey_KeyUp(object sender, KeyEventArgs e)
        {
            CheckHotkey();
        }

        void txbHotKey_LostFocus(object sender, EventArgs e)
        {
            CheckHotkey();
        }

        private void CheckHotkey()
        {
            if (txbHotKey.Text.EndsWith("+") || txbHotKey.Text == string.Empty)
            {
                txbHotKey.Text = "无";
            }
        }

        private void btnHotKey_Click(object sender, EventArgs e)
        {
            string hotkey = txbHotKey.Text.Replace("+", "");
            if (hotkey != "无" && hotkey != string.Empty)
            {
                uint modifies = 0;
                if (hotkey.Contains("Ctrl"))
                {
                    modifies |= HotkeyHelper.MOD_CONTROL;
                    hotkey = hotkey.Replace("Ctrl", "");
                }
                if (hotkey.Contains("Alt"))
                {
                    modifies |= HotkeyHelper.MOD_ALT;
                    hotkey = hotkey.Replace("Alt", "");
                }
                if (hotkey.Contains("Shift"))
                {
                    modifies |= HotkeyHelper.MOD_SHIFT;
                    hotkey = hotkey.Replace("Shift", "");
                }
                GameProvider.HotkeyHelper.RegisterHotKey(this.Handle, hotkeyId, modifies, (uint)hotkeyVk);
            }
        }

HotkeyHelper部分：

using System;
using System.Collections.Generic;
using System.Text;

using GFSucker.Game.Utility;

namespace GFSucker.Game.Provider
{
    public class HotkeyHelper : IDisposable
    {
        public const int MOD_ALT = 0x1;
        public const int MOD_CONTROL = 0x2;
        public const int MOD_SHIFT = 0x4;
        public const int MOD_WIN = 0x8;
        public const int WM_HOTKEY = 0x312;

        private Dictionary<int, Hotkey> dicHotkeys;

        public HotkeyHelper()
        {
            dicHotkeys = new Dictionary<int, Hotkey>();
        }

        public bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk)
        {
            if (dicHotkeys.ContainsKey(id))
            {
                if (dicHotkeys[id].IsRegistered)
                {
                    UnregisterHotKey(dicHotkeys[id].HWnd, id);      // unregister firstly
                    dicHotkeys[id].IsRegistered = false;
                }
                dicHotkeys[id].HWnd = hWnd;                         // set the new hwnd (normally should be the same)
            }
            else
            {
                dicHotkeys.Add(id, new Hotkey(hWnd, false));
            }

            dicHotkeys[id].IsRegistered = WinApi.RegisterHotKey(hWnd, id, fsModifiers, vk);

            return dicHotkeys[id].IsRegistered;
        }

        private bool UnregisterHotKey(IntPtr hWnd, int id)
        {
            return WinApi.UnregisterHotKey(hWnd, id);
        }

        #region Hotkey Information
        class Hotkey
        {
            public Hotkey(IntPtr hWnd, bool isRegistered)
            {
                _HWnd = hWnd;
                _IsRegistered = isRegistered;
            }

            private IntPtr _HWnd;

            public IntPtr HWnd
            {
                get { return _HWnd; }
                set { _HWnd = value; }
            }

            private bool _IsRegistered;

            public bool IsRegistered
            {
                get { return _IsRegistered; }
                set { _IsRegistered = value; }
            }
        }
        #endregion

        #region IDisposable 成员

        public void Dispose()
        {
            foreach (int id in dicHotkeys.Keys)
            {
                if (dicHotkeys[id].IsRegistered)
                {
                    UnregisterHotKey(dicHotkeys[id].HWnd, id);
                }
            }
        }

        #endregion
    }
}

Winapi声明：

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);

Override winform窗体的WndProc:(就是接受到hotkey信息的时候，做你想做的东西)

        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);

            if (m.Msg == HotkeyHelper.WM_HOTKEY)
            {
                MainForm mainform = this.Parent.Parent.Parent.Parent.Parent.Parent.Parent.Parent.Parent as MainForm;
                if (mainform != null)
                {
                    if (mainform.WindowState == FormWindowState.Minimized)
                    {
                        mainform.WindowState = FormWindowState.Normal;
                    }
                    mainform.Activate();
                }
            }
        }

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因为直接从程序中copy出来的，代码没有很多注释，不过都是非常浅显易懂的东西，名字看上去还是一目了然的，另外说一句，我觉得如果重构得比较好的代码是不需要做过多的注释的，代码本身就是注释，注释用在解释一些比较混乱的行为意图。希望对大家有帮助咯。bye~