Asp.net RestSharp 不反序列化 JSON 对象列表，始终为 Null

在RestSharp将返回内容反序列化到我的类中时，我遇到了一个问题.从我所有的搜索来看，我似乎做得很正确.我宁愿使用RestSharp的反序列化程序，也不愿退回到另一个包，比如Newstonsoft的Json.NET.

我正在做的是向GoTowBinar发出API请求，请求获取所有预定网络研讨会的列表:

var client = new RestClient(string.Format("https://api.citrixonline.com/G2W/rest/organizers/{0}/upcomingWebinars", "300000000000239000"));
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "OAuth oauth_token=" + System.Configuration.ConfigurationManager.AppSettings["GoToWebinar"]);
var response2 = client.Execute<List<RootObject>>(request);

如你所见，我想得到一个对象"RootObject"的列表(如下所示).我收到以下JSON响应2.内容:

[
   {
      "webinarKey":678470607,
      "subject":"Easton's Wild Rice Cooking Demo",
      "description":"Lorem ipsum dolor sit amet, consectetur adipiscing elit.",
      "organizerKey":300000000000239551,
      "times":[{"startTime":"2012-05-09T15:00:00Z","endTime":"2012-05-09T16:00:00Z"}],
      "timeZone":"America/Denver"
   },
   {
      "webinarKey":690772063,
      "subject":"Easton's Match Making Service",
      "description":"Lorem ipsum dolor sit amet, consectetur adipiscing elit.",
      "organizerKey":300000000000239551,
      "times":[{"startTime":"2012-05-09T15:00:00Z","endTime":"2012-05-09T16:00:00Z"}],
      "timeZone":"America/Denver"
   }
]

我使用上面的JSON结果使用http://json2csharp.com创建了以下对象:

public class RootObject
{
    public int webinarKey { get; set; }
    public string subject { get; set; }
    public string description { get; set; }
    public long organizerKey { get; set; }
    public List<Time> times { get; set; }
    public string timeZone { get; set; }
}

public class Time
{
    public string startTime { get; set; }
    public string endTime { get; set; }
}

问题在于如何应对.数据总是空的.由于某种原因，反序列化失败了，我不知道为什么.我的目标是能够使用foreach循环迭代结果:

foreach(RootObject r in response2.Data)
{
    lblGoToWebinar.Text += r.webinarKey.ToString() + ", ";
}

你知道为什么反序列化失败了吗？