C#模拟窗体系统菜单

usingSystem.Runtime.InteropServices;

constuintTPM_LEFTBUTTON=0;
constuintTPM_RIGHTBUTTON=2;
constuintTPM_LEFTALIGN=0;
constuintTPM_CENTERALIGN=4;
constuintTPM_RIGHTALIGN=8;
constuintTPM_TOPALIGN=0;
constuintTPM_VCENTERALIGN=0x10;
constuintTPM_BOTTOMALIGN=0x20;
constuintTPM_RETURNCMD=0x100;
constuintWM_SYSCOMMAND=0x0112;

DllImport#regionDllImport
[DllImport("User32.dll")]
staticexternIntPtrGetSystemMenu(IntPtrhWnd,boolbRevert);
[DllImport("User32.dll")]
staticexternboolGetCursorPos(outPointlpPoint);
[DllImport("User32.dll")]
staticexternintTrackPopupMenu(IntPtrhMenu,uintuFlags,
intx,inty,intnReserved,IntPtrhWnd,outRectangleprcRect);
[DllImport("User32.DLL")]
publicstaticexternintSendMessage(IntPtrhWnd,uintMsg,intwParam,intlParam);
#endregion

privatevoidbutton1_Click(objectsender,EventArgse)
...{
PointvPoint;
RectanglevRect;
GetCursorPos(outvPoint);
SendMessage(Handle,WM_SYSCOMMAND,TrackPopupMenu(
GetSystemMenu(Handle,false),
TPM_RETURNCMD|TPM_LEFTBUTTON,vPoint.X,vPoint.Y,
0,Handle,outvRect),0);
}