使用Newtonsoft和C#对嵌套JSON进行沙漠化

我正在尝试从Rest API解析Json响应。我可以得到良好的响应，并创建了一些类模型。我正在使用Newtonsoft的Json.Net.

我在响应中不断得到空值，不确定我是否正确设置了我的模型，或者遗漏了什么？

例如，我试图获得的是Data\Items\AEmployee 中的Firstname和ReferenceNumber

我Json回应的一个例子是：

{
"Data": {
    "Links": [
  {
    "Rel": "parent",
    "Href": "http://Api/url/",
    "Title": "Api",
  }
],
    "Items": [
  {
    "Employee": {
  "ReferenceNumber": "0078952",
  "EmployeeStatus": {
    "Name": "Active",
    "Value": 2
  },
  "ContactByPost": true,
  "ContactByMarketingEmails": true,
  "ClientDetails": [
    {
      "LimitedCompany": {
        "Id": "809f4455-673d-df11-9849-00155d072900",
        "Name": "Company"
      },
      "ClientCompany": {
        "Id": "62494f0c-617d-412f-81a3-ca40ef80f774",
        "Name": "Company 2"
      },
      "Code": "G67D",
      "RefCode": "1271",
      "Date": "/Date(1333456265000+0100)/",
      "Id": "009ea227-887d-e111-96ec-000c29128cee",
      "CreatedOn": "/Date(1333455954000+0100)/",
      "CreatedBy": {
        "Id": "5c2cb5eb-7368-e111-96eb-000c29128cee",
        "Name": "System Administrator"
      },
      "Archived": false
    }
  ],
  "Title": {
    "Name": "Mr",
    "Value": 1
  },
  "FirstName": "Fred",
  "MiddleName": null,
  "LastName": "Flintstone",
  "KnownAs": null,
  "DateOfBirth": "/Date(315576000000+0000)/",
  "Gender": {
    "Name": "Male",
    "Value": 1
  },
  "HomePhoneNumber": "55555555555",
  "MobilePhoneNumber": null,
  "Addresses": null,
  "EmailAddresses": null,
  "Id": "009ea227-887d-e111-96ec-000c29128cee",
  "CreatedOn": "/Date(1333455954000+0100)/",
  "CreatedBy": {
    "Id": "5c2cb5eb-7368-e111-96eb-000c29128cee",
    "Name": "System Administrator"
  },
  "Archived": false
},
    "Links": [
      {
        "Rel": "list",
        "Href": "http://Api/Addresses",
        "Title": "Addresses",
        "Description": "Get a list of addresses for this Employee."
      }
    ]
  }
]
}
}

我的模型设置如下所示：

public class Data
{
    public Collection<Links> Links { get; set; }
    public Collection<Items> Items { get; set; }
}
public class Items
{
    public Employee Employee { get; set; }
}
public class Employee
{
    public string ReferenceNumber { get; set; }
    public string FirstName { get; set; }
    public string MiddleName { get; set; }
    public string LastName { get; set; }
    public string Id { get; set; }
}
public class Links
{
    public string Rel { get; set; }
    public string Href { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
}

在我的控制器中，我正在执行以下操作：

Data data = Newtonsoft.Json.JsonConvert.DeserializeObject<Data>(APIResponse);

当调试时，我看到的只是Items和Links，它们都为null。我真的不确定我做错了什么，也不确定我是如何做到这一点的，这样我就可以访问C#代码中的值了？如有任何帮助，我们将不胜感激。应用程序是MVC3。我看到的例子是使用简单的json结构。