C# WinForm 繪製圓角表單

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 public void SetWindowRegion()        {            System.Drawing.Drawing2D.GraphicsPath FormPath;            FormPath = new System.Drawing.Drawing2D.GraphicsPath();            Rectangle rect = new Rectangle(0, 22, this.Width, this.Height - 22);//this.Left-10,this.Top-10,this.Width-10,this.Height-10);                             FormPath = GetRoundedRectPath(rect, 30);            this.Region = new Region(FormPath);        }        private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius)        {            int diameter = radius;            Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));            GraphicsPath path = new GraphicsPath();            //   左上方               path.AddArc(arcRect, 180, 90);            //   右上方               arcRect.X = rect.Right - diameter;            path.AddArc(arcRect, 270, 90);            //   右下角               arcRect.Y = rect.Bottom - diameter;            path.AddArc(arcRect, 0, 90);            //   左下角               arcRect.X = rect.Left;            path.AddArc(arcRect, 90, 90);            path.CloseFigure();            return path;        }        protected override void OnResize(System.EventArgs e)        {            this.Region = null;            SetWindowRegion();        }