Question

I have a situation where I need to differentiate different "types" of Customer objects.

I.e.:

public abstract class Customer
{    
    protected Customer(string customerType, string emailAddress, string phoneNUmber)
    {
        Type = customerType;
        ContactEmail = emailAddress;
        ContactPhone = phoneNUmber;
    }

    public string ContactEmail { get; private set; }

    public string ContactPhone { get; private set; }
}



internal class CorporateCustomer : Customer
{
    public CorporateCustomer(string customerType, string emailAddress, string phoneNumber, string businessName) : base(customerType, emailAddress, phoneNumber)
    {
        BusinessName = businessName;
    }

    public BusinessName BusinessName { get; private set; }
}


internal class IndividualCustomer : Customer
{
    public IndividualCustomer(string customerType, string emailAddress, string phoneNumber, string individualName) : base(customerType, emailAddress, phoneNumber)
    {
        IndividualName = individualName;
    }

    public string IndividualName { get; private set; }
}

I m使用ASP。 NET EF a. 核心,并在我的财产组合中这样做:

builder
    .HasDiscriminator(x => x.CustomerType)
    .HasValue<CorporateCustomer>("CORPORATE")
    .HasValue<IndividualCustomer>("INDIVIDUAL");

So, that the object comes out of the database properly as either an individual customer or a corporate customer.

我写了一名指挥手,希望更新<代码>Customer。

如果我希望更新<代码>ContactEmailAddress或,ContactPhoneNumber或甚至BusinessName或IndividualName,因为该物体是适当的类型。

But, if the user wants to change the object from a CorporateCustomer to an IndividualCustomer or vice versa. Fundamentally, what I need to accomplish is to change the CustomerType, blank out the "Name" field that isn t used and populate the one that is and store it.

我认为,正是在<条码>/条码>和(或)<条码>中采用了“虚拟方法,但可以尽可能使用少量援助。

Answer 1

为了直接回答你的问题,你可以这样做。或者,我认为,这种情况应当问这里的目标是什么。

EF的确使你能够分享这一地图,尽管这似乎并不像你为了你的情况而重新获得最好的里程。鉴于这一点,我认为,如果你在北美贸总会的表格中分享了信息,然后与其他拉美竞争和消费者保护局一样,你也许应该转向一个多层次的解决办法。 CUSTOMER或INDIVIDUAL_CUSTOMER. 当你想要完成转换时,你就可以简单地放弃表中的数值,并加入另一个表格。

从技术上来说,这将使某个特定北美贸总会能够进入每个类别,但只要有良好的商业规则,就可以轻易加以缓解。

如前所述,这是一个不同的解决办法,使你能够达到同样的目的。回答你的问题的直接答案是,你不能再做什么。

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