代码优先TPC - 基本表生成虽然它从不包含数据 [英] Code First TPC - Base Table Is Generated Though It Never Contains Data

问题描述

我正在遵循下面列出的Code First Tutorial：http：//weblogs.asp.net/manavi/archive/2011/01/03/inheritance-mapping-strategies-with-entity-framework-code-first-ctp5 -part-3-table-per-concrete-type-tpc-and-chosen-strategy-guidelines.aspx教程
使用名为BillingDetails的基类和两个子类CreditCards和BankAccounts。继承和保存数据工作正常。但是生成了3个表，每个表一个。正如所料，基类BillingDetails不包含任何数据。据我了解，
永远不会。代码是否有问题，或者TPC需要这个空表吗？如果这个表可以删除，有人可以告诉我怎么样？

解决方案

确切地说，我认为这是有道理的。一开始我们不能实例化一个抽象类，但是我们可以为子类实现它。

谢谢，

Werewolf，

I am following the Code First Tutorial listed below: http://weblogs.asp.net/manavi/archive/2011/01/03/inheritance-mapping-strategies-with-entity-framework-code-first-ctp5-part-3-table-per-concrete-type-tpc-and-choosing-strategy-guidelines.aspx The tutorial uses a base class named BillingDetails and two subclasses CreditCards and BankAccounts. Inheritance and saving data work fine. But 3 tables were generated, one for each class. As expected, the base class, BillingDetails, contains no data. As I understand it, never will. Is there a problem with the code, or is this empty table required for TPC to work? If this table can be removed, could someone please tell me how?

解决方案

Exactly, i think it makes sense. At very first we cannot instantiate an abstract class, but we can do it for the subclass.

Thanks,

Werewolf,

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