An entity object cannot be referenced by multiple instances of IEntityChangeTracker
asp.net c# caching entity-framework
Question
I use EF as ORM.
I dispose the objectContext on every request.
I save the entities in a cache layer, as my service gets lots of traffic.
I got sometimes get the error objectContext already disposed for some entities that I got from the cache.
I have added this code to elements that were retrived from the cache
if (maMDBEntities.Entry(group).State == EntityState.Detached)
{
maMDBEntities.Groups.Attach(group);
}
but now I sometimes get this error:
An entity object cannot be referenced by multiple instances of IEntityChangeTracker.
Was using Attach() an incorrect solution from the first place?
Accepted Answer
As we told you in your other question (will EF::attach(entity) will solve objectContext is already desposed?), you have to detach the Entities before attaching it to another Context!
If maMDBEntities is a new Context (not the one, which loaded the data), the EntityState is not "attached" from this Contexts point-of-view. So your check is not sufficient.
This maMDBEntities.Entry(group).State == EntityState.Detached will always be true for an Context, which did not load the Entity.
Licensed under: CC-BY-SA with attribution
Not affiliated with Stack Overflow
