Question

I save some EF entities in a cache layer I wrote. When I retrieve them from the cache I sometimes get a “contextObject is disposed” error. I want to attach a new contextObject after I get the entity from the cache. What side effects could this cause? What happens if I attach an entity which is already attached? Performance?

Answer 1

try like this.

ObjectStateEntry entry;
    if(context.ObjectStateManager.TryGetObjectStateEntry(entity, out entry)) {
        return (entry.State != EntityState.Detached);
    }

check for this Answer also. Entity Attached to a data context