Facebook c# SDK将地点映射到模型

下面是一个结果示例，(facebook public example)

(/搜索? q = coffee&类型= place&中心= 37.76、-122.427,距离= 1000)

我有这个模型:

[DataContract]
public class FBPlaces
{
    [DataMember(Name = "data")]
    public List<Place> Data { get; set; }
    [DataMember(Name = "paging")]
    public Paging Paging { get; set; }
}
[DataContract]
public class Paging
{
    [DataMember(Name = "next")]
    public string Next { get; set; }
}
[DataContract]
public class Place
{
    [DataMember(Name = "location")]
    public List<Location> Locations { get; set; }
    [DataMember(Name = "category")]
    public string Category { get; set; }
    [DataMember(Name = "name")]
    public string Name { get; set; }
    [DataMember(Name = "id")]
    public string ID { get; set; }
}
[DataContract]
public class Location
{
    [DataMember(Name = "street")]
    public string Street { get; set; }
    [DataMember(Name = "city")]
    public string City { get; set; }
    [DataMember(Name = "state")]
    public string State { get; set; }
    //[DataMember(IsRequired = false, Name = "country ")]
    //public string Country { get; set; }
    [DataMember(Name = "zip")]
    public string Zip { get; set; }
    [DataMember(Name = "latitude")]
    public double Latitude { get; set; }
    [DataMember(Name = "longitude")]
    public double Longitude { get; set; }
}

问题是映射"location"数组，我得到

系统。ArgumentException:为调用方法'Void set_Item(Int32, MyProject.Models.Location)'提供的参数数量不正确

• 如果我删除位置，一切都很好，我得到类别+名称+Id。(但没有位置)

• 如何修复?

• 在我的实际示例(不同的位置查询)中，"国家"并不总是显示，我如何处理这种数据?

[DataContract]
 public class Place
 {
    [DataMember(Name = "location")]
    public Location Locations { get; set; }
    [DataMember(Name = "category")]
    public string Category { get; set; }
    [DataMember(Name = "name")]
    public string Name { get; set; }
    [DataMember(Name = "id")]
    public string ID { get; set; }
}