Image與byte[]之間的轉換

 //將image轉化為二進制           
        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.Bmp);//將圖像以指定的格式存入緩存內存流

                    bt = new byte[mostream.Length];
                    mostream.Position = 0;//設置留的初始位置
                    mostream.Read(bt, 0, Convert.ToInt32(bt.Length));
                }
            }
            return bt;
        }

        /// <summary>
        /// 將實際位置中的照片轉化為byte[]類型寫入數據庫中
        /// </summary>
        /// <param name="strFile">string圖片地址</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>
        /// 讀取byte[]並轉化為圖片
        /// </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;
        }