如何仅使用一次循环引用在层次结构中加载实例？

public class Entity
{
    IList<Relationship> Relationships{get;set;}
}

public class Relationship
{
    public Relationship(Entity parent, IList<Entity> children)
    {
    //set properties
    }
    Entity Parent{get;private set;}
    IList<Entity> Children{get;private set;}
}