HttpClient无法获得返回的结果

Question

我是HttpClient和Web API的新手，所以我确信我错过了其他人明显的东西。我正在尝试使用新员工列表调用第三方Web API。 API应该返回JSON，其中包含有关上载员工的信息。这将是一个控制台应用程序，将每晚运行一次。没有要求运行Async。

我正在尝试跟随这些文章。  http://www.asp.net/web-api/overview/advanced/calling-a-web-api-from-a-net-client 和 http://typecastexception.com/post/2013/07/03/Building-Out-a-Clean-REST-ful-WebApi-Service-with-a-Minimal-WebApi-Project.aspx

以下代码尝试将API结果放入数组或列表中，但无法正常工作。当我在Debug中运行它时，它给了我一个例外“发生了一个或多个错误。”这并没有给我很多东西继续。

if (response.IsSuccessStatusCode)
                        {
                            AddEmployeeResult employeeResults =  response.Content.ReadAsAsync<AddEmployeeResult>().Result;
                        }

供应商给了我这个作为应该返回的例子。

[{"EmployeeNumber":"22449","SuccessfullyAdded":true,"Existing":false,"Comments":"App UserId:  6037"},{"EmployeeNumber":"379844","SuccessfullyAdded":true,"Existing":false,"Comments":" App UserId:  6038"},{"EmployeeNumber":"23718","SuccessfullyAdded":true,"Existing":false,"Comments":" App UserId ps:  6039"}]

我在我的控制台应用程序中创建了一个类，以匹配应该从API返回的内容。

class AddEmployeeResult
    {
        public string EmployeeNumber { get; set; }
        public bool SuccessfullyAdded { get; set; }
        public bool Existing { get; set; }
        public string Comments { get; set; }
    }

这是我正在尝试的代码。

static void Main(string[] args)
        {
            UploadNewEmployee();    
}

public static void UploadNewEmployee()
        {
            string serviceURI = "https://services.website.com/api/employees/upload";
            var credentials = new NetworkCredential("username", "password");
            var clientHandler = new HttpClientHandler();
            clientHandler.Credentials = credentials;
            clientHandler.PreAuthenticate = true;



            //***  Get the Employee Data  ***
            List<Employee> lstEmployee = new List<Employee>();
            try
            {
                lstEmployee = DataManager.GetEmployees();
            }
            catch (Exception ex)
            {
                logger.Error("Error while getting data. | {0} | Trace: {1}", ex.Message, ex.StackTrace);
            }



            //***  Process users if there is data.  ***
            if (lstEmployee != null && lstEmployee.Count > 0)
            {
                logger.Info("Employee count: " + lstEmployee.Count);
                logger.Debug("Web API Uri: " + serviceURI);

                try
                {
                    using (var client = new HttpClient(clientHandler))
                    {
                        client.DefaultRequestHeaders.Clear();
                        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                        HttpResponseMessage response = client.PostAsJsonAsync(serviceURI, lstEmployee).Result;

                        if (response.IsSuccessStatusCode)
                        {
                            AddEmployeeResult employeeResults =  response.Content.ReadAsAsync<AddEmployeeResult>().Result;
                        }

                    }
                }
                catch (Exception ex)
                {
                    logger.Error("Error posting to Web API. | {0} | Trace: {1}", ex.Message, ex.StackTrace);
                }

            }
            else
            {
                logger.Info("No records found.");
            }
        }