Code First CTP4：为什么参考属性忽略[Required]属性？ [英] Code First CTP4: Why is the [Required] attribute ignored for reference properties?

问题描述

如果我将原始属性标记为[Required]，则生成DB列不可为空。 但如果我将引用属性标记为[必需]，则会被忽略： 生成的DB列仍然可以为空。 如果我想要它生成Not Nullable，
我必须通过上下文配置它  -  这是一种痛苦，并且不一致。

虽然这是记录在案的行为，但对我来说似乎很奇怪。您是否计划扩展[必需]以使用参考属性？

Richard

解决方案

嗨理查德，

 

这是很好的反馈，这是我们没有真正考虑过支持的东西，我们将在未来版本中考虑添加它。

如果您在类中公开了一个外键属性，那么您可以添加[Required]属性，但我可以看到在实际引用上允许它将是
当你没有在课堂上公开外键时很有用。

 

〜罗文

If I mark a primitive property as [Required] then the DB column is generated Not Nullable.  But if I mark a reference property as [Required] it is ignored:  the generated DB column is still nullable.  If I wanted it generated Not Nullable, I have to configure this through the context  -  which is a pain, and inconsistent.

Although this is documented behaviour, it seems very odd to me. Do you have plans to extend [Required] to work with reference properties ?

Richard

解决方案

Hi Richard,

 

This is good feedback, this is something we hadn’t really considered supporting, we will look at adding it in a future release.

If you expose a foreign key property in your class then you could add the [Required] attribute to that, but I can see that allowing it on the actual reference would be useful when you don’t have the foreign key exposed in your class.

 

~Rowan

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