实体框架代码首先 - DbContext上没有Detach（）方法 [英] Entity Framework Code First - No Detach() method on DbContext

问题描述

我想知道为什么DbContext对象上没有Detach方法，就像ObjectContext一样。我只能假设这个遗漏是有意的，但我很难弄清楚为什么。我需要能够分离和重新附加实体（例如，将缓存放入ASP.NET项目中）。但是，由于我不能分离一个实体，当我尝试附加与之前的上下文相关联的实体时，我得到一个实体对象不能被IEntityChangeTracker的多个实例引用。

I'm wondering why there is no Detach method on the DbContext object like there is for ObjectContext.  I can only assume this omission was intentional, but I have a hard time figuring out why.  I need to be able to detach and re-attach entities (for putting in the cache in an ASP.NET project, for example).  However, since I can't detach an entity, when I try to attach an entity that was associated with a previous context, I get the "An entity object cannot be referenced by multiple instances of IEntityChangeTracker" exception.

这里有什么指导？我错过了什么吗？

What's the guidance here?  Am I missing something?

推荐答案

对于可能绊倒这个问题的人，CTP5您现在需要写一个

For people that might stumble upon this question, as of CTP5 you now need to write

((IObjectContextAdapter)context).ObjectContext

以获取ObjectContext。

in order to get to ObjectContext.

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