C# winform 创建自定义控件，

1、新建自定义控件，如下图：

2、新建完，重写 protected override void OnPaint(PaintEventArgs pe)事件

 protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
            Graphics g = this.CreateGraphics();

            g.SmoothingMode = SmoothingMode.AntiAlias;
            Brush brush = new SolidBrush(Color.FromArgb(212, 212, 212));
            g.FillEllipse(brush, 0, 0, 100, 100);
            brush = new SolidBrush(Color.FromArgb(169, 169, 169));
            g.FillEllipse(brush, 4, 4, 92, 92);
            brush = new SolidBrush(Color.GreenYellow);//填充的颜色
            g.FillEllipse(brush, 7, 7, 86, 86);

            brush = new SolidBrush(Color.FromArgb(75, 75, 75));//填充的颜色
            g.DrawString("83", new Font("微软雅黑", 20), brush, new PointF(18, 35));
            g.DrawString("%", new Font("