c# 后端请求另一个后端

后端请求另一个后端，类似以前端请求后端。这里用到 HttpClient 类。

                var _httpClient = new HttpClient();
　　　　　　　　　 var tokenHeader = HttpContext.Request.Headers["Authorization"].ToString();
                _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Authorization", tokenHeader);
                var parms = new
                {
                    TTDH_DingS = gxb.TTDH_DingS,
                    ShiGuDM = gxb.ShiGuDM,
                    CPH = gxb.CPH,
                    COLOR = gxb.Color
                };
                string json = JsonConvert.SerializeObject(parms);
                var content = new StringContent(json, Encoding.UTF8, "application/json");

                var dingsundata = (await _httpClient.GetAsync("http://localhost:8081/api/DingSun/ShowDSCLBaseJBInfo?TTDH_DingS=" + gxb.TTDH_DingS + "&ShiGuDM=" + gxb.ShiGuDM + "&CPH=" + gxb.CPH + "&COLOR=" + gxb.Color));
                //var dingsundata = (await _httpClient.PostAsync("http://localhost:8081/api/DingSun/ShowDSCLBaseJBInfo", content));
                var responseValue = await dingsundata.Content.ReadAsStringAsync();
                if (dingsundata.StatusCode == System.Net.HttpStatusCode.OK)
                {
                    var resftp = JsonConvert.DeserializeObject(responseValue);

                    MessageModel<DingSunIndexPrice> obj = JsonConvert.DeserializeObject<MessageModel<DingSunIndexPrice>>(responseValue);
                    if (obj.success)
                    {
                        DingSunIndexPrice dinsunPrice = obj.response;
                    }
                }

还有文件流的方式

           using (MemoryStream memoryStream = new MemoryStream(file))
            {
　　　　　　　　　//file 是byte[] 流文件
                var _httpClient = new HttpClient();
                _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Authorization", token);
                var content = new MultipartFormDataContent();
                content.Add(new StreamContent(memoryStream, (int)memoryStream.Length), "file", fileName);

                var dingsundata = (await _httpClient.PostAsync(url, content));
                var responseValue = await dingsundata.Content.ReadAsStringAsync();
                if (dingsundata.StatusCode == System.Net.HttpStatusCode.OK)
                {
                    var resftp = JsonConvert.DeserializeObject(responseValue);
                    MessageModel<List<string>> obj = JsonConvert.DeserializeObject<MessageModel<List<string>>>(responseValue);
                    if (obj.success)
                    {
                        return obj.response[0];

                    }
                    else {
                        return "";
                    }
                }

 但是 同一个项目中，自己模拟前端请求是不能成功的，总会被拦截了。