Image和byte之间转换

 

        //将image转化为二进制
          public static byte[] GetByteImage(Image img)

         {

                 byte[] bt=null;

                 if(!img.Equals(null))
                 {
                     using (MemoryStream mostream = new MemoryStream())
                     {
                         Bitmap bmp = new Bitmap(img);

                         bmp.Save(mostream, System.Drawing.Imaging.ImageFormat.Jpeg);//将图像以指定的格式存入缓存内存流

                         bt = new byte[mostream.Length];

                         mostream.Position = 0;//设置留的初始位置

                         mostream.Read(bt, 0, Convert.ToInt32(bt.Length));

                     }

                   }

                 return bt;

          }

 

 

                    MemoryStream ms2 = new MemoryStream();
                    picPhoto.Image.Save(ms2, System.Drawing.Imaging.ImageFormat.Jpeg);
                    byte[] bf2 = new byte[ms2.Length];
                    ms2.Position = 0;
                    ms2.Read(bf2, 0, Convert.ToInt32(ms2.Length));
                    ms2.Close();

 

 

   

       /// <summary>
        /// 将实际位置中的照片转化为byte[]类型写入数据库中
        /// </summary>
        /// <param name="strFile">string图片地址</param>
        /// <returns>byte[]</returns>
        public static byte[] GetBytesByImagePath(string strFile)
        {
            byte[] photo_byte = null;
            using (FileStream fs =
            new FileStream(strFile, FileMode.Open, FileAccess.Read))
            {
                using (BinaryReader br = new BinaryReader(fs))
                {
                    photo_byte = br.ReadBytes((int)fs.Length);
                }
            }

            return photo_byte;
        }

       /// <summary>
        /// 读取byte[]并转化为图片
        /// </summary>
        /// <param name="bytes">byte[]</param>
        /// <returns>Image</returns>
        public static Image GetImageByBytes(byte[] bytes)
        {
            Image photo = null;
            using (MemoryStream ms = new MemoryStream(bytes))
            {
                ms.Write(bytes, 0, bytes.Length);
                photo = Image.FromStream(ms, true);
            }

            return photo;
        }