C#字节图片互转、字节转换图片、图片转换字节、byte[]转换图片、图片转换成byte[]

原文地址：http://www.cnblogs.com/wifi/articles/3522773.html

        /// <summary>
        /// 图片转换成字节流
        /// </summary>
        /// <param name="img">要转换的Image对象</param>
        /// <returns>转换后返回的字节流</returns>
        public static byte[] ImgToByt(Image img)
        {
            MemoryStream ms = new MemoryStream();
            byte[] imagedata = null;
            img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            imagedata = ms.GetBuffer();
            return imagedata;
        }
        /// <summary>
        /// 字节流转换成图片
        /// </summary>
        /// <param name="byt">要转换的字节流</param>
        /// <returns>转换得到的Image对象</returns>
        public static Image BytToImg(byte[] byt)
        {
            MemoryStream ms = new MemoryStream(byt);
            Image img = Image.FromStream(ms);
            return img;
        }
        /// <summary>
        /// 根据图片路径返回图片的字节流byte[]
        /// </summary>
        /// <param name="imagePath">图片路径</param>
        /// <returns>返回的字节流</returns>
        private static byte[] getImageByte(string imagePath)
        {
            FileStream files = new FileStream(imagePath, FileMode.Open);
            byte[] imgByte = new byte[files.Length];
            files.Read(imgByte, , imgByte.Length);
            files.Close();
            return imgByte;
        }