网上好不容易找到的资料

已经测试通过了

等明天再研究。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Collections;

namespace HotKey1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public delegate void HotkeyEventHandler(int HotKeyID);
private int Hotkey1;
public class Hotkey : System.Windows.Forms.IMessageFilter
{
Hashtable keyIDs = new Hashtable();
IntPtr hWnd; 

public event HotkeyEventHandler OnHotkey; 

public enum KeyFlags
{
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;
Application.AddMessageFilter(this);
} 

public int RegisterHotkey(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()
{
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;
}
} 

public void OnHotkey(int HotkeyID) //Ctrl+F2隐藏窗体，再按显示窗体。
{
if (HotkeyID == Hotkey1)
{
if (this.Visible == true)
this.Visible = false;
else
this.Visible = true;
}
else
{
this.Visible = false;
}
} 

private void Form1_Load(object sender, EventArgs e)
{
Hotkey hotkey;
hotkey = new Hotkey(this.Handle);
Hotkey1 = hotkey.RegisterHotkey(System.Windows.Forms.Keys.F2, Hotkey.KeyFlags.MOD_CONTROL); //定义快键(Ctrl + F2)
hotkey.OnHotkey += new HotkeyEventHandler(OnHotkey);
}
}
}