具有在 EF 6 中工作的两个联接的 LINQ 查询在 EF 7 中出错

我有一个在EF 6（代码优先）项目中工作的LINQ查询。现在，我已将代码迁移到 EF 7，此查询现在引发异常：参数异常：未为类型"X.Models.Domain.MadeChoice"定义属性"Int32 ID"

查询：

var madeChoices = from res in X.Instance.Residence
                  join room in X.Instance.Room on res.ID equals room.Residence.ID
                  join madeChoice in X.Instance.MadeChoice on room.ID equals madeChoice.Room.ID
                  where res.ID == residence.ID
                  select room.MadeChoices;

MadeChoice类：

public class MadeChoice
{
    public virtual int ID { get; set; }
    [Required]
    public virtual ChoiceGroup Choicegroup { get; set; }
    [Required]
    public virtual Room Room { get; set; }
    [Required]
    public virtual Item Item { get; set; }
}

房间等级：

public class Room
{
    public virtual int ID { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public virtual Residence Residence { get; set; }
    public virtual RoomType RoomType { get; set; }
    public virtual List<MadeChoice> MadeChoices { get; set; }
    // Constructors:
    public Room()
    {
        this.MadeChoices = new List<MadeChoice>();
    }
}

住宅类：

public class Residence
{
    public int ID { get; set; }
    public string ApartmentNumber { get; set; }
    public static IQueryable<List<MadeChoice>> GetMadeChoices(Residence residence)
    {
        var madeChoices = from res in X.Instance.Residence
                            join room in X.Instance.Room on res.ID equals room.Residence.ID
                            join madeChoice in X.Instance.MadeChoice on room.ID equals madeChoice.Room.ID
                            where res.ID == residence.ID
                            select room.MadeChoices;
        System.Diagnostics.Debug.Write("MadeChoices.Count: ");
        System.Diagnostics.Debug.WriteLine(madeChoices.Count());
        foreach (var madechoice in madeChoices)
        {
            System.Diagnostics.Debug.Write("MadeChoice.Count: ");
            System.Diagnostics.Debug.WriteLine(madechoice.Count());
        }
        return madeChoices;
    }
    // Navigational properties:
    public virtual List<Room> Rooms { get; set; }
    public virtual ResidenceType ResidenceType { get; set; }
    public virtual List<Tenant> Tenants { get; set; }
    public virtual List<PeriodResidenceDeadline> PeriodResidenceDeadline { get; set; }
    // Constructors:
    public Residence()
    {
        this.Rooms = new List<Room>();
        this.Tenants = new List<Tenant>();
        this.PeriodResidenceDeadline = new List<PeriodResidenceDeadline>();
    }
}

最初，该 ID 不是虚拟的，但它不会影响错误。数据库看起来与 EF 6 中所示。关系是一对多的。我使用 EF 7.0.0-rc1-final。

有什么提示吗？

提前感谢，

彼得