鼠标滚轮控制滚动条

        /// <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 (panel_content.RectangleToScreen(panel_content.DisplayRectangle).Contains(mousePoint))
            {
                 //滚动
                 panel_content.AutoScrollPosition = new Point(0, panel_content.VerticalScroll.Value - e.Delta);
             }
        }