具有两个在EF 6中工作的连接的LINQ查询在EF 7中给出了错误

Question

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,此查询现在抛出异常:ArgumentException: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; }
}

房间类:

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>();
    }
}

公寓类:

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,ID不是虚拟的,但它不会影响错误.数据库看起来像在EF 6中.关系是一对多的.我使用EF 7.0.0-rc1-final.

任何提示？

提前致谢,

彼得

Answer 1

正如 EF 团队所说，EF Core RC1 不处理复杂的子类型（请参阅此处的路线图https://github.com/aspnet/EntityFramework/wiki/Roadmap#in-progress for Query）

对于查询，这将在 EF Core 1.0 RTM 版本中处理。

同时，您可以使用我在这里列举的解决方案之一：EF Core 流畅映射到内部对象属性（问题与映射相同）