winform 窗体圆角设计

        private void BeautiLoginForm_Paint(object sender, PaintEventArgs e)
        {
            Type(this, 25, 0.1);
        }
        private void Type(Control sender, int p_1, double p_2)
        {
            GraphicsPath oPath = new GraphicsPath();
            oPath.AddClosedCurve(new Point[] {
                new Point(0, sender.Height / p_1),
                new Point(sender.Width / p_1, 0),
                new Point(sender.Width - sender.Width / p_1, 0),
                new Point(sender.Width, sender.Height / p_1),
                new Point(sender.Width, sender.Height - sender.Height / p_1),
                new Point(sender.Width - sender.Width / p_1, sender.Height),
                new Point(sender.Width / p_1, sender.Height),
                new Point(0, sender.Height - sender.Height / p_1) }, (float)p_2);
            sender.Region = new Region(oPath);
        }

        private void BeautiLoginForm_Resize(object sender, EventArgs e)
        {
            Type(this, 25, 0.1);
        }