winform圆角窗体绘制

1、窗口的FormBorderStyle属性设置为None。

2、在窗体Paint事件中调用函数：

public static void RoundFormPainter(object sender, PaintEventArgs e)
{
　　Form form = ((Form)sender);
　　List<Point> list = new List<Point>();
　　int width = form.Width;
　　int height = form.Height;

　　//左上
　　list.Add(new Point(0, 5));
　　list.Add(new Point(1, 5));
　　list.Add(new Point(1, 3));
　　list.Add(new Point(2, 3));
　　list.Add(new Point(2, 2));
　　list.Add(new Point(3, 2));
　　list.Add(new Point(3, 1));
　　list.Add(new Point(5, 1));
　　list.Add(new Point(5, 0));

　　//右上
　　list.Add(new Point(width - 5, 0));
　　list.Add(new Point(width - 5, 1));
　　list.Add(new Point(width - 3, 1));
　　list.Add(new Point(width - 3, 2));
　　list.Add(new Point(width - 2, 2));
　　list.Add(new Point(width - 2, 3));
　　list.Add(new Point(width - 1, 3));
　　list.Add(new Point(width - 1, 5));
　　list.Add(new Point(width - 0, 5));

　　//右下
　　list.Add(new Point(width - 0, height - 5));
　　list.Add(new Point(width - 1, height - 5));
　　list.Add(new Point(width - 1, height - 3));
　　list.Add(new Point(width - 2, height - 3));
　　list.Add(new Point(width - 2, height - 2));
　　list.Add(new Point(width - 3, height - 2));
　　list.Add(new Point(width - 3, height - 1));
　　list.Add(new Point(width - 5, height - 1));
　　list.Add(new Point(width - 5, height - 0));

　　//左下
　　list.Add(new Point(5, height - 0));
　　list.Add(new Point(5, height - 1));
　　list.Add(new Point(3, height - 1));
　　list.Add(new Point(3, height - 2));
　　list.Add(new Point(2, height - 2));
　　list.Add(new Point(2, height - 3));
　　list.Add(new Point(1, height - 3));
　　list.Add(new Point(1, height - 5));
　　list.Add(new Point(0, height - 5));

　　Point[] points = list.ToArray();

　　GraphicsPath shape = new GraphicsPath();
　　shape.AddPolygon(points);

　　//将窗体的显示区域设为GraphicsPath的实例
　　form.Region = new System.Drawing.Region(shape);
}