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)3072;
                HttpWebResponse res = (HttpWebResponse)request.GetResponse();
                StreamReader rd = new StreamReader(res.GetResponseStream());
                string theContent = rd.ReadToEnd();

                string WHSE = Request["WHSE"].ToString();
                string transId = OrderData.GenerateTransId(18);
                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[0]["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, 0, 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(8),
                                            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());
                        }
                    }