pdf文件流生成pdf文件

protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                Code.Login Starr_model = new Code.Login();
                Code.InsuranceModel.InsuranceSegment_Result result = new InsuranceModel.InsuranceSegment_Result();
                try
                {
                    //判断接口请求是否成功
                    result = Code.InsuranceDecodeJson.Starr_GetLoginDecodeJson();
                    if (result.Success == true)
                    {
                        string filepath = Server.MapPath("~") + "\\GoldenPalmInsurance\\Code\\Starr.pdf";
                        string[] RequestArr = { "http://dicc2.ins24.com/ah/pdf_printer/policies/" + policyid + "", "application/pdf" };
                        //获取PDF文件流
                        Stream str = Starr_model.Starr_PrinterPDF(RequestArr, result.UserCookie);
                        StreamReader reader = new StreamReader(str, Encoding.UTF8);
                        using (FileStream fileStream = new FileStream("" + filepath + "", FileMode.Create, FileAccess.Write))
                        {
                            byte[] data = Encoding.UTF8.GetBytes(reader.ToString());
                            while (true)
                            {
                                int size = str.Read(data, 0, data.Length);
                                if (size > 0)
                                {
                                    fileStream.Write(data, 0, size);
                                }
                                else
                                {
                                    break;
                                }
                            }
                        }
                        //这里是你文件在项目中的位置,根目录下就这么写  
                        String FullFileName = filepath;
                        Response.Clear();
                        Response.ClearHeaders();
                        Response.Buffer = false;
                        Response.ContentType = "application/pdf";
                        Response.AddHeader("Content-Disposition", "attachment;filename=" + policyid + ".pdf");
                        Response.WriteFile(FullFileName);
                    }
                }
                catch (Exception ex)
                {
                    Response.Write(ex.Message);
                }
                finally
                {
                    System.Web.HttpContext.Current.Response.Flush();
                    System.Web.HttpContext.Current.Response.End();
                    Response.Close();
                }
            }
        }

 /// <summary>
        /// 
        /// </summary>
        /// <param name="args"></param>
        /// <param name="UserCookie"></param>
        /// <returns></returns>
        public Stream Starr_PrinterPDF(String[] args, CookieCollection UserCookie)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(args[0]);//将host和参数直接拼接
            request.Method = "GET";
            request.ContentType = args[1];
            request.Accept = "*/*";
            request.CookieContainer = new CookieContainer();

            request.CookieContainer.Add(UserCookie);//设置req的cookie

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            Stream dataStream = response.GetResponseStream();
            return dataStream;
        }