How do I clear tracked entities in entity framework

Question

I am running some correction code that runs over a big pile of entities, as it progress its speed decreases, that is because the number of tracked entities in the context in

Answer 1

1. Possibility: detach the entry

dbContext.Entry(entity).State = EntityState.Detached;

When you detach the entry the change tracker will stop tracking it (and should result in better performance)

See: http://msdn.microsoft.com/de-de/library/system.data.entitystate(v=vs.110).aspx

2. Possibility: work with your own Status field + disconnected contexts

Maybe you want to control the status of your entity independently so you can use disconnected graphs. Add a property for the entity status and transform this status into the dbContext.Entry(entity).State when performing operations (use a repository to do this)

public class Foo
{
    public EntityStatus EntityStatus { get; set; }
}

public enum EntityStatus
{
    Unmodified,
    Modified,
    Added
}

See following link for an example: https://www.safaribooksonline.com/library/view/programming-entity-framework/9781449331825/ch04s06.html