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I'm trying to update a POCO object using entity framework in the following way:
context.Jobs.Attach(job);
context.SaveChanges();
That does not work. No error is thrown, it just isn't updating the values in the database.
I tried:
context.Jobs.AttachTo("Jobs", job);
context.SaveChanges();
Nothing wrongs, still no error and no updates.
493
Update Objects in Entity Framework 4.0 The steps to update an existing entity are quite simple. First retrieve an instance of the entity from the EntitySet<T> (in our case ObjectSet<Customer>), then edit the properties of the Entity and finally call SaveChanges() on the context.
Attach is used when you know that an entity already exists in the database but want to make some changes while change state to modified when you have already made the changes.
The Entity state represents the state of an entity. An entity is always in any one of the following states. Added: The entity is marked as added. Deleted: The entity is marked as deleted.
An entity is in this state immediately after it has been created and before it is added to the object context. An entity is also in this state after it has been removed from the context by calling the Detach(Object) method or if it is loaded by using a NoTrackingMergeOption.
What about changing the ObjectState?
context.ObjectStateManager.ChangeObjectState(job, System.Data.EntityState.Modified);
From MSDN: ObjectStateManager.ChangeObjectState Method.
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