using (Pen mypen = new Pen(Color.Black, 6)) { mypen.StartCap = LineCap.DiamondAnchor;//设置起始箭头 mypen.EndCap = LineCap.ArrowAnchor;//设置结尾箭头 e.Graphics.DrawLine(mypen, 20f, 20f, 100f, 20f);//绘制直线 };//创建钢笔对象
原文：http://www.cnblogs.com/wjshan0808/p/4235832.html