可以使用实体框架4 CTP5访问TPH映射中的鉴别器值 [英] Can I access the discriminator value in TPH mapping with Entity Framework 4 CTP5

问题描述

使用实体框架4 CTP5代码首先和这个例子

Using Entity Framework 4 CTP5 Code First and this example

是否可以访问鉴别器值？

Is it possible to access the discriminator value?

我想在投影中使用它，如

I would like to use it in a projection like

context.BillingDetails.Select(x => new { Number = x.Number, DiscrimitatorValue = /* how do I get the discriminator value? */ });

从这篇文章我明白鉴别器不能映射到一个属性，但有没有其他方式访问？ / p>

From this post I understand the discriminator cannot be mapped to a property but is there any other way of accessing it?

推荐答案

从 Morteza Manavi在他的评论中发布简单的答案是否

你应该知道，鉴别器列是由Code First内部使用的，你不能读取/ /从继承映射的角度来写它的值。

you should be aware that the discriminator column is used internally by Code First and you cannnot read/write its values from an inheritance mapping standpoint.

要访问鉴别器，我必须执行一个 SqlQuery 对数据库或更改我的映射st策略。

To access the discriminator I would have to execute a SqlQuery against the database or change my mapping strategy.

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