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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.
What's the guidance here? Am I missing something?
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If you want to detach an object that is already attached to the context, set the state to Detached . If you want to load entities from the DB without attaching them at all to the context (no change tracking), use AsNoTracking . @kjbartel : this is the expected behavior, since the entity has no link with the context.
DbContext. Remove Method (Microsoft.
As per Microsoft “A DbContext instance represents a session with the database and can be used to query and save instances of your entities. DbContext is a combination of the Unit Of Work and Repository patterns.” In simplified way we can say that DbContext is the bridge between Entity Framework and Database.
For people that might stumble upon this question, as of CTP5 you now need to write
((IObjectContextAdapter)context).ObjectContext in order to get to ObjectContext.
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