我的代码如下
  private void button9_Paint(object sender, PaintEventArgs e)
  {

  Control c = sender as Control;
  GraphicsPath gp = new GraphicsPath();
  gp.AddEllipse(new Rectangle(0, 0, 50, c.Height - 2));
  c.Region = new Region(gp);
   
  }

我的代码如下
  private void button9_Paint(object sender, PaintEventArgs e)
  {

  Control c = sender as Control;
  GraphicsPath gp = new GraphicsPath();
  gp.AddEllipse(new Rectangle(0, 0, 50, c.Height - 2));
  c.Region = new Region(gp);
   
  }