实体框架 4 CTP5 TPT 继承不适用于深层层次结构？

发布于 2024-10-26 20:29:53 字数 574 浏览 0 评论 0原文

我在使用 CTP5 中的代码优先 API 映射稍微复杂的继承关系时遇到问题。当我有这个：

Table A
--------
int ID (PK)

Table B
--------
int ID (PK)
varchar Something


public class A {
    public int ID { get; set; }
}

public class B : A {
    public string Something { get; set; }
}

......一切都很好。但是当我添加以下内容时：

Table C
-------
int ID (PK)
varchar SomethingElse

public class C : B {
    public string SomethingElse { get; set; }
}

...然后它会出错，并显示“无效的列名称鉴别器”，这意味着 EF 感到困惑并认为我正在尝试进行 TPH 映射。还有其他人看过这个吗？这是 EF 中的已知问题吗？我需要做一些特殊的映射吗？

预先感谢您的帮助。

原文

I'm having a problem mapping a a slightly more complicated inheritance relationship using the code-first API in CTP5. When I have this:

Table A
--------
int ID (PK)

Table B
--------
int ID (PK)
varchar Something


public class A {
    public int ID { get; set; }
}

public class B : A {
    public string Something { get; set; }
}

...everything works just fine. But when I add this:

Table C
-------
int ID (PK)
varchar SomethingElse

public class C : B {
    public string SomethingElse { get; set; }
}

...then it errors out with "Invalid column name Discriminator", which implies that EF is getting confused and thinks I'm trying to do a TPH mapping. Has anyone else seen this? Is this a known issues in EF? Do I need to do some special mapping?

Thanks in advance for your help.

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