c# - Entity Framework Mysql 嵌套属性

Question

我有这个类结构。当我做一些选择时，我收到异常错误。

public class A
{
    public int AId { get; set; }
    public virtual ICollection<B> B { get; set; }
}

public class B
{
    public int BId { get; set; }
    public virtual C C { get; set; }

    public int AId { get; set; }
    public virtual A A { get; set; }
}

public class C // Manifiesto carga
{
    [Key]
    [ForeignKey("B")]
    public int CId { get; set; }

    public virtual B B { get; set; }
    public virtual ICollection<D> D { get; set; }
    public virtual ICollection<E> E { get; set; }
}

public class D
{
    public int DId { get; set; }
    public string Nombre { get; set; }

    public int CId { get; set; }
    public virtual C C { get; set; }
}

public class E
{
    public int EId { get; set; }
    public string Nombre { get; set; }

    public int CId { get; set; }
    public virtual C C { get; set; }
}


    context.AA
                .Include(e => e.B.Select(s => s.C.D))
                .Include(e => e.B.Select(s => s.C.E)).FirstOrDefault(e => e.AId == 1);

我迷路了，我该怎么办？或者我哪里失败了？

谢谢。

(对不起我的英语)

Image exception

在上图中您可以看到异常消息。

Answer 1

当您将父级也放入 D 和 E 时，问题是否已解决

public class D {
   public virtual C C {get;set;}
}
public class E {
   public virtual C C {get;set;}
}