WebService 传输图片

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[WebMethod]
        /*
         WebService中实现了一个方法GetImage(),在内存中生成一张100x100的Bitmap.然后在该Bitmap上画一条线,再将这个图片转换为byte[]传递给调用者.调用的程式将该byte[]还原为Bitmap.
         */
        public byte[] GetImage()
        {
            //生成BitMap
            byte[] ret = null;
            Bitmap bm = new Bitmap(100,100);
            for (int i=0; i < 100; i++)
            {
                bm.SetPixel(i,i,Color.Blue);
            }

            //从内存读取出来存放到返回结果中
            MemoryStream ms = new MemoryStream();
            ImageCodecInfo[] inf = ImageCodecInfo.GetImageEncoders();
            EncoderParameters eps = new EncoderParameters(1);
            Encoder ec = Encoder.ColorDepth;
            EncoderParameter ep = new EncoderParameter(ec,80);
            eps.Param[0] = ep;
            bm.Save(ms,inf.First(info => info.MimeType == "image/bmp"),eps);
            ret = new byte[ms.Length];
            ret = ms.ToArray();
            return ret;
        }