Linq交叉和除外

Question

我有两节课：

public class Customer
{
    public string FirstName { get; set; }

    public string LastName { get; set; }

    public bool isActif { get; set; }

    public Product[] Product { get; set; }
}

public class Product
{
    public string Id { get; set; }
}

还有两个例子：

var Customer1 = new Customer[]
{
    new Customer()
    {
        FirstName = "FirstName1",
        LastName = "LastName1",
        isActif = true,
        Product = new Product[]
        {
            new Product()
            {
                Id = "2",
                Date = DateTime.Now.Date
            }
        }
    },
    new Customer()
    {
        FirstName = "FirstName2",
        LastName = "LastName2",
        isActif = false,
        Product = new Product[]
        {
            new Product()
            {
                Id = "3",
                Date = DateTime.Now.Date
            }
        }
    }
};

var Customer2 = new Customer[]
{
    new Customer()
    {
        FirstName = "FirstName1",
        LastName = "LastName1",
        isActif = true,
        Product = new Product[]
        {
            new Product()
            {
                Id = "2",
                Date = DateTime.Now.Date
            }
        }
    }
};

我希望通过LastName中的贡献来获得两个实例的交集。如果不在我的类中实现Equals（）和GetHashCode（）方法，是否可以这样做？我有很多属性。

另外，我想知道第一个权限而不是第二个权限的客户。反过来说