Code
usingSystem;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Text;
usingSystem.Windows.Forms;
usingSystem.Runtime.InteropServices;
usingSystem.Collections;

namespaceHotKey1
{
publicpartialclassForm1:Form
{
publicForm1()
{
InitializeComponent();
}
publicdelegatevoidHotkeyEventHandler(intHotKeyID);
privateintHotkey1;
publicclassHotkey:System.Windows.Forms.IMessageFilter
{
HashtablekeyIDs=newHashtable();
IntPtrhWnd;

publiceventHotkeyEventHandlerOnHotkey;

publicenumKeyFlags
{
MOD_ALT=0x1,
MOD_CONTROL=0x2,
MOD_SHIFT=0x4,
MOD_WIN=0x8
}
[DllImport("user32.dll")]
publicstaticexternUInt32RegisterHotKey(IntPtrhWnd,UInt32id,UInt32fsModifiers,UInt32vk);

[DllImport("user32.dll")]
publicstaticexternUInt32UnregisterHotKey(IntPtrhWnd,UInt32id);

[DllImport("kernel32.dll")]
publicstaticexternUInt32GlobalAddAtom(StringlpString);

[DllImport("kernel32.dll")]
publicstaticexternUInt32GlobalDeleteAtom(UInt32nAtom);

publicHotkey(IntPtrhWnd)
{
this.hWnd=hWnd;
Application.AddMessageFilter(this);
}

publicintRegisterHotkey(KeysKey,KeyFlagskeyflags)
{
UInt32hotkeyid=GlobalAddAtom(System.Guid.NewGuid().ToString());
RegisterHotKey((IntPtr)hWnd,hotkeyid,(UInt32)keyflags,(UInt32)Key);
keyIDs.Add(hotkeyid,hotkeyid);
return(int)hotkeyid;
}

publicvoidUnregisterHotkeys()
{
Application.RemoveMessageFilter(this);
foreach(UInt32keyinkeyIDs.Values)
{
UnregisterHotKey(hWnd,key);
GlobalDeleteAtom(key);
}
}

publicboolPreFilterMessage(refSystem.Windows.Forms.Messagem)
{
if(m.Msg==0x312)
{
if(OnHotkey!=null)
{
foreach(UInt32keyinkeyIDs.Values)
{
if((UInt32)m.WParam==key)
{
OnHotkey((int)m.WParam);
returntrue;
}
}
}
}
returnfalse;
}
}

publicvoidOnHotkey(intHotkeyID)//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;
}
}

privatevoidForm1_Load(objectsender,EventArgse)
{
Hotkeyhotkey;
hotkey=newHotkey(this.Handle);
Hotkey1=hotkey.RegisterHotkey(System.Windows.Forms.Keys.F2,Hotkey.KeyFlags.MOD_CONTROL);//定义快键(Ctrl+F2)
hotkey.OnHotkey+=newHotkeyEventHandler(OnHotkey);
}
}
}
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