C#实现圆角

1.先把 FormBorderStyle 属性设 None;

2.在Form代码里加上如下代码
#region 圆角

        private void SetFormCircle()

        {

            int radian = 4; //圆弧角的比率，可以自己改变这个值看具体的效果

            int w = this.Width; //窗体宽

            int h = this.Height; //窗体高




            //对于矩形的窗体，要在一个角上画个弧度至少需要2个点，所以4个角需要至少8个点

            Point p1 = new Point(radian, 0);

            Point p2 = new Point(w - radian, 0);

            Point p3 = new Point(w, radian);

            Point p4 = new Point(w, h - radian);

            Point p5 = new Point(w - radian, h);