What is the difference between objectcontext and datacontext

Well semantically they are exactly same but they reduced lot of extra noise that ObjectContext had. Like exposing a set required more work, for instance:. Basically on the ObjectContext , when you do dot.

What the EF team actually wanted to expose on DbContext are entities which are only specific to your domain and rest of ability of the framework is tucked in under different properties. It just makes the programming experience easier. This means if you are using ObjectContext right now, with a little bit of code, you can easily move to DbContext. The error you see means that the model hash stored in EdmMetadata table is different from the model hash computed from the model in the application.

Because you are running database creation from a different application your dev. You'll need to go through and change all of your Method calls to us Add. If there is some core reason why you want to use AddObject, then explain in more detail what your needs are here so someone can better help you. What is difference between dbcontext. But I get an error: 'System. Thank you. Asked By: Zoya Sheikh.

Answered By: Sergey Berezovskiy. Queries may not return the results you expect if you are querying a context that has been modified and you haven't saved changes. Queries always hit the datastore and it is the datastore that determines which entities are returned.

I have been studying EF intensively for months now and I am still a complete novice. The learning curve is pretty big so I have tried to limit myself to the Object Services layer. I have scant knowledge of ESQL or the mapping side. I have been using C and. Net for many years but I have not used an ORM tool before so I have no direct experence that can help determine if the issue I am looking at is peculiar to the EF or if it applies to ORM tools in general,.

The support from this forum has been essential - thanks to everyone who has posted replies to my dum questions. The content you requested has been removed. Learn More. Ask a question. Quick access. Search related threads. Remove From My Forums. Answered by:. Archived Forums. Sign in to vote. Hello everyone, I am puzzled by an issue that I normally should have solved without any problems. Can you help me?

Thank you. Monday, August 4, PM. Apologies if you already knew this. Tuesday, August 5, AM. For Graham: Given an entity called lets say Residents, in LinqToEntities you can retrieved it via the following: private global: ystem. Unchanged where ose. Entity is Customer Now you have the entRies and can just use their Entity property to get at the entiteis. It's not pretty but that's how to do what you want. That will only find a single entity though.

Tuesday, August 5, PM. Hi Julie, I am afraid I meant the object existing in the database. Is that ok or any other better way.

Decker - My usablility is only for specific stored procedures and there is no single table added to the project. Let me know whether using ObjectContext will degrade performance or any drawbacks of using it rather than DB context. Can you provide me some examples for the intellisenses which may not work when we use object context?

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