定义引用相同 table (EF7/core) 的多对多关系

Question

模型有 item 个实体。 并且会有依赖于（using）其他项目的项目。多对多关系。示例：

Item A is used by Item B, C, and F.
Item B is used by Item C, F and H.

如何正确定义不同项目之间的方向关系？

项目：

public class Item
    {
    public int Id
        { get; set;}
    public string Name
        {get; set;}
    }

我定义依赖关系的第一种方法是：

public class ItemDependency
{
    [Key]
    public int Id
    { get; set; }

    [ForeignKey("ItemParentId")]
    public Item ItemParent { get; set; }

    public int ItemParentId{ get; set; }

    [ForeignKey("ItemDependentId")]
    public Item ItemDependentId { get; set; }

    public int ItemDependentId { get; set; }

}

Answer 1

根据文档EF7 Many-to-many relationship：

Many-to-many relationships without an entity class to represent the join table are not yet supported. However, you can represent a many-to-many relationship by including an entity class for the join table and mapping two separate one-to-many relationships.