HttpWebRequest 知识点

                string Url = System.Configuration.ConfigurationManager.AppSettings["CallPaperInvoiceURL"];
                 Url = @"" + Url + "?id=" + PK_ECOrderHead + "&whse=" + Whse + "";
                 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
                 request.Method = "GET";
                 request.ProtocolVersion = HttpVersion.Version10;
                 ServicePointManager.SecurityProtocol = (SecurityProtocolType);
                 HttpWebResponse res = (HttpWebResponse)request.GetResponse();
                 StreamReader rd = new StreamReader(res.GetResponseStream());
                 string theContent = rd.ReadToEnd();

                 string WHSE = Request["WHSE"].ToString();
                 string transId = OrderData.GenerateTransId();
                 eStore2.App_Code.Data.OmsRoot.Root root = new eStore2.App_Code.Data.OmsRoot.Root();
                 eStore2.App_Code.Data.OmsRoot.Head head = new eStore2.App_Code.Data.OmsRoot.Head();
                 head.transId = transId;
                 head.transCode = "S1005";
                 eStore2.App_Code.Data.OmsRoot.Body body = new eStore2.App_Code.Data.OmsRoot.Body();
                 body.WHSE = WHSE;
                 root.head = head;
                 root.body = body;
                 Encoding encoding = Encoding.UTF8;
                 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(OrderData.Get_GetIMInventoryURL(System.Configuration.ConfigurationManager.AppSettings["GetIMInventory_KeyName"]).Rows[]["KeyValue"].ToString());
                 request.Method = "POST";
                 request.Accept = "text/html, application/xhtml+xml, */*";
                 request.ContentType = "application/json";
                 byte[] buffer = encoding.GetBytes(JsonConvert.SerializeObject(root));
                 request.ContentLength = buffer.Length;
                 request.GetRequestStream().Write(buffer, , buffer.Length);
                 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                 using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
                 {
                     string Result = reader.ReadToEnd();
                     eStore2.App_Code.Data.OmsRoot.Root root_s = JsonConvert.DeserializeObject<eStore2.App_Code.Data.OmsRoot.Root>(Result);
                     List<eStore2.App_Code.Data.OmsRoot.DetailItem> detailItems = root_s.body.detail;
                     foreach (var item in detailItems)
                     {
                         OrderData.Insert_MDB_SYNC_LOG(item.PartNo, item.Qty);
                     }
                 }
                 ShowAlertMessage("库存获取完毕");

                   var rss = new JObject
                    {
                        {"Head",new JObject
                            {
                                {"TransCode","X1009" },
                                {"TransId",transid}
                            }
                        },
                        { "Body", new JObject
                            {
                                {"OrderSN", q.OrderSn },
                                {"WHSE",q.Whse},
                                {"SNs", SNs }
                            }
                        }
                     };                   

                    //呼叫接口
                    HttpContent JSONContents = new StringContent(JsonConvert.SerializeObject(rss), Encoding.UTF8, "application/json");
                    using (var response = httpClient.PostAsync(Url, JSONContents).Result)
                    {
                        if (response.IsSuccessStatusCode)
                        {
                            string s = $"{response.Content.ReadAsStringAsync().Result}";
                            if (s == "Y")
                            {
                                using (var tran = _Database.Database.BeginTransaction())
                                {
                                    try
                                    {
                                        await _Database.OmsEcjsonlog.AddAsync(new OmsEcjsonlog
                                        {
                                            CreateDateTime = System.DateTime.UtcNow.AddHours(),
                                            Fk = _HeadId,
                                            Json = JsonConvert.SerializeObject(rss),
                                            Msg = $"{q.OrderSn} Paper Invoice"
                                        });
                                        await _Database.Log.AddAsync(GenerateECOrderLog($"成功"));
                                        await _Database.SaveChangesAsync();
                                        tran.Commit();
                                    }
                                    catch (Exception ex)
                                    {
                                        if (tran != null)
                                            tran.Rollback();
                                        throw new Exception($"Failed,{ex.Message}");
                                    }
                                }
                            }
                            else
                                throw new Exception($"服务系统:{s}");
                        }
                        else
                        {
                            throw new Exception(response.StatusCode.ToString());
                        }
                    }