使用Id vs对象的EF外键引用

public class Order
{
    public int OrderId { get; set; }
    public int CustomerId { get; set; } // 外键引用Customer实体的主键Id
    public Customer Customer { get; set; } // 导航属性
}

public class Customer
{
    public int CustomerId { get; set; }
    public string Name { get; set; }
}

public class Order
{
    public int OrderId { get; set; }
    public Customer Customer { get; set; } // 外键引用Customer实体对象
}

public class Customer
{
    public int CustomerId { get; set; }
    public string Name { get; set; }
}