C#重新绘制按钮

 public  class ButtonX:Button 
    {
       
      
            protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
            {

                base.OnPaint(e);
                System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
                path.AddEllipse(0, 0, this.Width, this.Height);
                this.Region = new Region(path);
                
            }

            protected override void OnMouseEnter(EventArgs e)
            {
                Graphics g = this.CreateGraphics();
                g.DrawEllipse(new Pen(Color.Blue), 0, 0, this.Width, this.Height);
                g.Dispose();
            }
          
        }