using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace TestLibrary
{
    public sealed class MyButton : Control
    {

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            drawMyButton(e);
        }

        private void drawMyButton(PaintEventArgs e)
        {
            Rectangle r = new Rectangle(this.Location,this.Size);
            using (Brush b = new SolidBrush(this.BackColor))
            {
                e.Graphics.FillEllipse(b, r);
            }
        }
    }
}
为什么我在窗体里创建这个BUTTON，它的外观不是一个圆或者椭圆呢，而是一个矩形

研究了一下自己解决了，自己顶一下