全局快捷键

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新建一个SystemHotKey类

using System;using System.Runtime.InteropServices;using System.Windows.Forms;namespace SystemHotKey{    public delegate void HotkeyEventHandler(int HotKeyID);    public class Hotkey : System.Windows.Forms.IMessageFilter    {        System.Collections.Hashtable keyIDs = new System.Collections.Hashtable();        IntPtr hWnd;        public event HotkeyEventHandler OnHotkey;        public enum KeyFlags        {            MOD_NULL = 0x0,             MOD_ALT = 0x1,            MOD_CONTROL = 0x2,            MOD_SHIFT = 0x4,            MOD_WIN = 0x8        }        [DllImport("user32.dll")]        public static extern UInt32 RegisterHotKey(IntPtr hWnd, UInt32 id, UInt32 fsModifiers, UInt32 vk);        [DllImport("user32.dll")]        public static extern UInt32 UnregisterHotKey(IntPtr hWnd, UInt32 id);        [DllImport("kernel32.dll")]        public static extern UInt32 GlobalAddAtom(String lpString);        [DllImport("kernel32.dll")]        public static extern UInt32 GlobalDeleteAtom(UInt32 nAtom);        public Hotkey(IntPtr hWnd)        {            this.hWnd = hWnd;            System.Windows.Forms.Application.AddMessageFilter(this);        }        public int RegisterHotkey(System.Windows.Forms.Keys Key, KeyFlags keyflags)        {            UInt32 hotkeyid = GlobalAddAtom(System.Guid.NewGuid().ToString());            RegisterHotKey((IntPtr)hWnd, hotkeyid, (UInt32)keyflags, (UInt32)Key);            keyIDs.Add(hotkeyid, hotkeyid);            return (int)hotkeyid;        }        public void UnregisterHotkeys()        {            System.Windows.Forms.Application.RemoveMessageFilter(this);            foreach (UInt32 key in keyIDs.Values)            {                UnregisterHotKey(hWnd, key);                GlobalDeleteAtom(key);            }        }        public bool PreFilterMessage(ref System.Windows.Forms.Message m)        {            if (m.Msg == 0x312)            {                if (OnHotkey != null)                {                    foreach (UInt32 key in keyIDs.Values)                    {                        if ((UInt32)m.WParam == key)                        {                            OnHotkey((int)m.WParam);                            return true;                        }                    }                }            }            return false;        }    }}

用法如下

定义一个Hotkey1全局变量

private int Hotkey1;

FormLoad事件里面写：
            Hotkey hotkey;
            hotkey = new Hotkey(this.Handle);
            Hotkey1 = hotkey.RegisterHotkey(Keys.Enter, Hotkey.KeyFlags.MOD_NULL);
            hotkey.OnHotkey += new HotkeyEventHandler(OnHotkey);

写OnHotkey事件
public void OnHotkey(int HotkeyID)
        {
            if (HotkeyID == Hotkey1)
            {
               MessageBox.Show("Enter");
            }
        }