C#Image和Icon的相互转化

Image img = Image.FromHbitmap(icon.ToBitmap().GetHbitmap());
                            Graphics g = Graphics.FromImage(img);
                            g.DrawImage(img, 0, 0, img.Width, img.Height);
                            Font f = new Font("Verdana", 32);
                            Brush b = new SolidBrush(Color.Red);                            
                            g.DrawString("!!!", f, b,0, 0);
Icon  icon = Icon.FromHandle(((Bitmap)img).GetHicon());
                            g.Dispose();