ASP.NET 将文件流写入临时文件，并打开

 public void PrintOrderTestForpdf()
        {
            //1、创建实体
            PrintOrderInfo model = new PrintOrderInfo()
            {
                ApiToken = "XXX",
                LabelFormat = "A4_2",
                OutPutFormat = "pdf",
                PrintCustoms = false,
                PrintProduct = false,
                PrintProductFormat = "{sku}",
                OrderList = new List<PrintOrderDetail>()
                {
                    new PrintOrderDetail() { OrderId="123456",TrackingNo=""}
                }
            };
            //2、请求接口，并接收返回的文件流
            MemoryStream bts = (MemoryStream)RuiYouPaiDal.Instance.PrintOrderForPdf(model);
            //3、将文件流写去临时的pdf文件，并打开
            Process.Start(GererateFileName(bts));
        }
 /// <summary>
        /// 将接收到的文件流写入临时文件
        /// </summary>
        /// <param name="result"></param>
        /// <returns></returns>
        public static string GererateFileName(MemoryStream result)
        {
            var filename = GetGeneratedFileName();//1、生成.pdf格式的临时文件
            var fs = new FileStream(filename, FileMode.OpenOrCreate);
            var w = new BinaryWriter(fs);
            w.Write(result.ToArray());//2、将接收到的文件流写入临时文件
            fs.Close();
            result.Close();

            return filename;
        }
        /// <summary>
        /// 生成临时文件
        /// </summary>
        /// <returns></returns>
        public static string GetGeneratedFileName()
        {
            var guid = Guid.NewGuid().ToString().Replace("-", "");
            var filepath = Path.Combine(Path.GetTempPath(), guid + ".pdf");
            return filepath;
        }