将JSON数组传递给wcfweb服务

我正在尝试将JSON数组传递给WCF服务。但似乎不起作用。实际上,我从服务中提取了一个数组[GetStudents],并将完全相同的数组发送回服务[SaveStudents],但没有收到任何内容(空数组)。 JSON数组的格式如下:

[
  {"Name":"John","Age":12},
  {"Name":"Jane","Age":11},
  {"Name":"Bill","Age":12}
]

//Contracts
[DataContract]
public class Student{
  [DataMember]public string Name { get; set; }
  [DataMember]public int Age{ get; set; }
}

[CollectionDataContract(Namespace = "")]
public class Students : List<Student>
{
  [DataMember]public Endorsements() { }
  [DataMember]public Endorsements(IEnumerable<Student> source) : base(source) { }
}

//Operations
public Students GetStudents()
{
  var result = new Students();
  result.Add(new Student(){Name="John",12});
  result.Add(new Student(){Name="Jane",11});
  result.Add(new Student(){Name="Bill",12});
  return result;
}

//Operations
public void SaveStudents(Students list)
{
  Console.WriteLine(list.Count); //It always returns zero
}

有没有一种特殊的方法可以将数组发送到WCF REST服务?