//减少闪烁
            //SetStyle(ControlStyles.SupportsTransparentBackColor , true);
            //SetStyle(ControlStyles.AllPaintingInWmPaint , true);
            //SetStyle(ControlStyles.UserPaint , true);
            //双缓冲
            SetStyle(ControlStyles.DoubleBuffer, true);
            SetStyle(ControlStyles.ResizeRedraw, true);
            //this.Refresh();

------解决方案--------------------
两个方法：
1、使用双缓冲内存位图直接操作；
2、使用wpf做个界面给程序调用.

------解决方案--------------------
第三方控件不好吗

------解决方案--------------------

C# code
#region 窗体缩放

        const int WM_NCHITTEST = 0x0084;
        const int HTLEFT = 10;//左边界
        const int HTRIGHT = 11;//右边界
        const int HTTOP = 12;//上边界
        const int HTTOPLEFT = 13;//左上角
        const int HTTOPRIGHT = 14;//右上角
        const int HTBOTTOM = 15;//下边界
        const int HTBOTTOMLEFT = 0x10;//左下角
        const int HTBOTTOMRIGHT = 17;//右下角

        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);
            switch (m.Msg)
            {
                case WM_NCHITTEST:
                    {
                        Point vPoint = new Point((int)m.LParam & 0xFFFF,
                            (int)m.LParam >> 16 & 0xFFFF);
                        vPoint = PointToClient(vPoint);
                        //判断：仅当当前窗体状态不是最大化时，相关鼠标事件生效
                        if (this.WindowState != FormWindowState.Maximized)
                        {
                            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