Entity Framework 5 是否支持唯一约束?

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想知道 Entity Framework 5 是否支持对实体属性的唯一约束?如果是这样，我如何指定一个属性应该是唯一的?

Wondering if Entity Framework 5 supports unique constraints on entity properties? If so, how can I specify that a property should be unique?

推荐答案

不，它没有.过去曾计划在 EF 5.0 中包含独特的约束功能:

No, it doesn't. There were plans in the past to include a unique constraint feature in EF 5.0:

blogs.msdn/b/efdesign/archive/2011/03/09/unique-constraints-in-the-entity-framework.aspx

但是你可以看到帖子顶部有一个更新:

But you can see that there is an update on top of the post:

更新:此功能已推迟，不会包含在实体框架 5.

Update: this feature has been postponed and will not be included in Entity Framework 5.

您可以对该功能进行投票，以提高其实施的优先级...

You can vote on the feature to raise possibly the priority it gets implemented with...

/data.uservoice/forums/72025-entity-framework-feature-suggestions/suggestions/1050579-unique-constraint-ie-candidate-key-support

...因为显然目前它甚至不在 EF 6.0 的路线图上:

...because apparently it isn't even on the roadmap for EF 6.0 at the moment:

entityframework.codeplex/wikipage?title=Roadmap