panel 绑定鼠标滚轮事件

 1 void formsample_mousewheel(object sender, MouseEventArgs e)
 2         {
 3             //获取光标位置
 4             Point mousepoint = new Point(e.X, e.Y);
 5             //换算成相对本窗体的位置
 6             mousepoint.Offset(this.Location.X, this.Location.Y);
 7             //判断是否在panel内
 8             if (pl_message.RectangleToScreen(pl_message.DisplayRectangle).Contains(mousepoint))
 9             {
10                 //滚动
11                 pl_message.AutoScrollPosition = new Point(0, pl_message.VerticalScroll.Value - e.Delta);
12             }
13         }

1  this.MouseWheel += formsample_mousewheel;