const int HTLEFT = 10;

const int HTRIGHT = ;

const int HTTOP = ;

const int HTTOPLEFT = ;

const int HTTOPRIGHT = ;

const int HTBOTTOM = ;

const int HTBOTTOMLEFT = 0x10;

const int HTBOTTOMRIGHT = ;

protected override void WndProc(ref Message m)

{

    switch (m.Msg)

    {

        case 0x0084:

            base.WndProc(ref m);

            Point vPoint = new Point((int)m.LParam & 0xFFFF,

                (int)m.LParam >>  & 0xFFFF);

            vPoint = PointToClient(vPoint);

            if (vPoint.X <= )

                if (vPoint.Y <= )

                    m.Result = (IntPtr)HTTOPLEFT;

                else if (vPoint.Y >= ClientSize.Height - )

                    m.Result = (IntPtr)HTBOTTOMLEFT;

                else m.Result = (IntPtr)HTLEFT;

            else if (vPoint.X >= ClientSize.Width - )

                if (vPoint.Y <= )

                    m.Result = (IntPtr)HTTOPRIGHT;

                else if (vPoint.Y >= ClientSize.Height - )

                    m.Result = (IntPtr)HTBOTTOMRIGHT;

                else m.Result = (IntPtr)HTRIGHT;

            else if (vPoint.Y <= )

                m.Result = (IntPtr)HTTOP;

            else if (vPoint.Y >= ClientSize.Height - )

                m.Result = (IntPtr)HTBOTTOM;

            break;

        case 0x0201://鼠标左键按下的消息

            //m.Msg = 0x00A1;//更改消息为非客户区按下鼠标

            //m.LParam = IntPtr.Zero;//默认值

            //m.WParam = new IntPtr(2);//鼠标放在标题栏内 

　　　　　　　　//以下做了一些修正，确保放大缩小按钮区域可以正常使用

　　　　　　　　Point point = Control.MousePosition;
　　　　　　　　point = PointToClient(point);
　　　　　　　　if (point.X < this.Width - 100 && point.Y < 30)
　　　　　　　　{
　　　　　　　　　　m.Msg = 0x00A1;//更改消息为非客户区按下鼠标
　　　　　　　　　　m.LParam = IntPtr.Zero;//默认值
　　　　　　　　　　m.WParam = new IntPtr(2);//鼠标放在标题栏内
　　　　　　　　}

            base.WndProc(ref m);

            break;

        default:

            base.WndProc(ref m);

            break;

    }

}