将base64编码转换图片

 　　　　/// <summary>
        /// 二进制Base64编码转图片
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public string ByteToPicture(string bytes)
        {
            string[] urls = bytes.Split(',');
            string u = urls[1];
            byte[] by = Convert.FromBase64String(u);
            MemoryStream ms = new System.IO.MemoryStream(by);
            Bitmap bmImage = new Bitmap(ms);
            string pName = Context.Server.MapPath("~/File/" + Guid.NewGuid().ToString() + ".png");
            bmImage.Save(pName);
            return pName;
        }