在HTML Web调用期间无法访问类的成员

Question

我在尝试访问HTTP GET中的foreach循环内的类文件的成员时遇到问题。在过去，当我完成这项工作时，我已经能够创建foreach循环并访问类文件，以测试拉取数据。但现在当我进入d。我的班级成员都没有。我不明白我在这里做错了什么。

班级档案：

class WhoIsOnCallParse : IEnumerable
    {
        public int CommonId { get; set; }
        public int DurationWorked { get; set; }
        public bool IsOnCall { get; set; }
        public int ScheduleRotationId { get; set; }
        public int GroupId { get; set; }
        public int GroupRoleId { get; set; }
        public string CurrentMemberEndDate { get; set; }
        public string CurrentMemberStartDate { get; set; }
        public int RotationPosition { get; set; }
        public int Duration { get; set; }
        public string FullName { get; set; }
        public bool IsRotation { get; set; }
        public int ScheduleOccurrenceId { get; set; }
        public bool IsActive { get; set; }
        public string RoleName { get; set; }
        public string GroupName { get; set; }
        public int TeamMemberLeaderCommonId { get; set; }
        public string UserName { get; set; }
        public string Email { get; set; }  
    }

HTTP呼叫方法：

public void WhoIsOnCall()
        {
            DateTime dte = DateTime.Today;
            string fixedStartDate = String.Format("{0:yyyy-MM-dd " + "05:00:00.000" + "}", dte);

            string URL = "http://oncall/api/GenerateRotation/mergedRotation/teamMemberOnCall/";
            string urlParameters = "?date=" + fixedStartDate + "Z&groupRoleId=1093&scheduleRotationId=1087";
            // string urlParameters = "?date=2017-04-21T18:55:15.194Z&groupRoleId=1093&scheduleRotationId=1087";

            HttpClient client = new HttpClient(new HttpClientHandler() { UseDefaultCredentials = true });
            client.BaseAddress = new Uri(URL);

            client.DefaultRequestHeaders.Accept.Add(
                new MediaTypeWithQualityHeaderValue("application/json"));

            HttpResponseMessage response = client.GetAsync(urlParameters).Result;  // Blocking call!
            if (response.IsSuccessStatusCode)
            {
                // Parse the response body. Blocking!
                var oncall = response.Content.ReadAsAsync<WhoIsOnCallParse>().Result;
                foreach (var d in oncall)
                {
                    Console.WriteLine("{0}", d.);  //This is where my problem is.
                }
            }
            else
            {
                Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase);
            }
        }