c#对base64的编码的图片解码

用c++进行图片编码后依然可以用此方法解码，

/// <summary>

        /// base64的编码的图片解码
        /// </summary>
        /// <param name="streamByte"></param>
        /// <returns></returns>
        public static string ReturnPhoto(byte[] streamByte, decimal zid, decimal mid)
        {
            System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte);
            System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
            string datetime = DateTime.Now.ToFileTime().ToString();//AppDomain.CurrentDomain.SetupInformation.ApplicationBase+"/"+
            string SaveImgName = datetime + "-" + zid + "-" + mid + ".jpg";
            img.Save(path + SaveImgName, System.Drawing.Imaging.ImageFormat.Jpeg);
            return "../upload/" + SaveImgName;

        }

其中，path是在webconfig里设置的图片保存路径