C# 改变无边框窗体的尺寸大小

以下代码为修改窗体尺寸的代码：

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const int HTLEFT = 10;

const int HTRIGHT = 11;

const int HTTOP = 12;

const int HTTOPLEFT = 13;

const int HTTOPRIGHT = 14;

const int HTBOTTOM = 15;

const int HTBOTTOMLEFT = 0x10;

const int HTBOTTOMRIGHT = 17;



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 >> 16 & 0xFFFF);

            vPoint = PointToClient(vPoint);

            if (vPoint.X <= 5)

                if (vPoint.Y <= 5)

                    m.Result = (IntPtr)HTTOPLEFT;

                else if (vPoint.Y >= ClientSize.Height - 5)

                    m.Result = (IntPtr)HTBOTTOMLEFT;

                else m.Result = (IntPtr)HTLEFT;

            else if (vPoint.X >= ClientSize.Width - 5)

                if (vPoint.Y <= 5)

                    m.Result = (IntPtr)HTTOPRIGHT;

                else if (vPoint.Y >= ClientSize.Height - 5)

                    m.Result = (IntPtr)HTBOTTOMRIGHT;

                else m.Result = (IntPtr)HTRIGHT;

            else if (vPoint.Y <= 5)

                m.Result = (IntPtr)HTTOP;

            else if (vPoint.Y >= ClientSize.Height - 5)

                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 

            base.WndProc(ref m);

            break; 

        default:

            base.WndProc(ref m);

            break;

    }

}

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原文地址：http://www.cnblogs.com/jiangshui/archive/2010/01/11/1644393.html