Winform 窗体实现圆角展示

触发窗体的Resize事件，如下所示：

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#region 界面实现圆角        private void LoginForm_Resize(object sender, EventArgs e)        {            if (this.WindowState == FormWindowState.Normal)            {                SetWindowRegion();            }            else            {                this.Region = null;            }        }          public void SetWindowRegion()        {            System.Drawing.Drawing2D.GraphicsPath FormPath;            FormPath = new System.Drawing.Drawing2D.GraphicsPath();            Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);            FormPath = GetRoundedRectPath(rect, 10);//10代表圆角角度大小            this.Region = new Region(FormPath);        }          /// <summary>        ///        /// </summary>        /// <param name="rect">窗体大小</param>        /// <param name="radius">圆角大小</param>        /// <returns></returns>        private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius)        {            int diameter = radius;            Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));            GraphicsPath path = new GraphicsPath();              path.AddArc(arcRect, 180, 90);//左上角              arcRect.X = rect.Right - diameter;//右上角            path.AddArc(arcRect, 270, 90);              arcRect.Y = rect.Bottom - diameter;// 右下角            path.AddArc(arcRect, 0, 90);              arcRect.X = rect.Left;// 左下角            path.AddArc(arcRect, 90, 90);            path.CloseFigure();            return path;        }          #endregion