C# WinForm中Panel实现用鼠标操作滚动条

由于在WinForm中Panel不能直接响应鼠标的滚动事件，只好采用捕获窗体的滚动事件。 
方法如下：
在窗体的Load事件注册滚动事件，并增加对应的方法 

        private void FormSample_Load(object sender, EventArgs e)
        {
            
            //注册事件
            this.MouseWheel += new MouseEventHandler(FormSample_MouseWheel);
        }

        /// <summary>
        /// 滚动方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void FormSample_MouseWheel(object sender, MouseEventArgs e)
        {
            //获取光标位置
            Point mousePoint = new Point(e.X,e.Y);
            //换算成相对本窗体的位置
            mousePoint.Offset(this.Location.X, this.Location.Y);       
            //判断是否在panel内
            if (pnlDownload.RectangleToScreen(
              pnlDownload.DisplayRectangle).Contains(mousePoint))
            {
                //滚动
                pnlDownload.AutoScrollPosition = new Point(
                0, pnlDownload.VerticalScroll.Value - e.Delta);
            }
        }

(摘自互联网，经过使用，确实可行) (完)