C# Image与ByteArray转换

public static System.Drawing.Image ByteArrayToImage(byte[] b)
        {
            ImageConverter imgconv = new ImageConverter();
            System.Drawing.Image img = (System.Drawing.Image)imgconv.ConvertFrom(b);
            return img;
        }
        public static byte[] ImageToByteArray(System.Drawing.Image img)
        {
            ImageConverter imgconv = new ImageConverter();
            byte[] b = (byte[])imgconv.ConvertTo(img, typeof(byte[]));
            return b;
        }