private void Form1_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; g.SmoothingMode = SmoothingMode.HighQuality;//去掉锯齿 g.CompositingQuality = CompositingQuality.HighQuality;//合成图像的质量 g.TextRenderingHint = TextRenderingHint.SingleBitPerPixelGridFit;//去掉文字的锯齿 System.Drawing.Pen p = new System.Drawing.Pen(Color.FromArgb(255, 146, 126, 102), 2); drawRoundedRect(g, p, 20, 20, 200, 200, 20); } /// <summary> /// 带圆角矩形 /// </summary> /// <param name="radius">圆角半径</param> private void drawRoundedRect(Graphics g, System.Drawing.Pen pen, int x, int y, int width, int height, int radius) { //去掉圆角的锯齿 g.SmoothingMode = SmoothingMode.HighQuality; //上 g.DrawLine(pen, new PointF(x + radius, y), new PointF(x + width - radius, y)); //下 g.DrawLine(pen, new PointF(x + radius, y + height), new PointF(x + width - radius, y + height)); //左 g.DrawLine(pen, new PointF(x, y + radius), new PointF(x, y + height - radius)); //右 g.DrawLine(pen, new PointF(x + width, y + radius), new PointF(x + width, y + height - radius)); //左上角 g.DrawArc(pen, new Rectangle(x, y, radius * 2, radius * 2), 180, 90); //右上角 g.DrawArc(pen, new Rectangle(x + width - radius * 2, y, radius * 2, radius * 2), 270, 90); //左下角 g.DrawArc(pen, new Rectangle(x, y + height - radius * 2, radius * 2, radius * 2), 90, 90); //右下角 g.DrawArc(pen, new Rectangle(x + width - radius * 2, y + height - radius * 2, radius * 2, radius * 2), 0, 90); }