HttpClient 上傳文件帶參數 ContentType 記錄

參考博文地址 
https://www.cnblogs.com/cplemom/p/11264040.html
https://www.cnblogs.com/netcs/p/12789162.html

  var client = _httpClientFactory.CreateClient();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue($"multipart/form-data"));
                var content = new MultipartFormDataContent();
                content.Add(new StringContent(type), "type");
                byte[] arr;
                using (Stream fileStream = file.OpenReadStream())
                {
                    arr = new byte[fileStream.Length];
                    fileStream.Read(arr, 0, arr.Length);
                }
                var upFileContent = new ByteArrayContent(arr);
                upFileContent.Headers.ContentType = new MediaTypeHeaderValue(file.ContentType);
                content.Add(upFileContent, "file", file.FileName);
                var reponse = await client.PostAsync("ip地址/api/FileUpload/ImageUpload", content);

　　主要還是橙色代碼塊 設置文件ContentType

不設置這個 接口端File.ContentType是接收不到類型的