Question

Lets say, i have an EntityObject called someProduct :

//Get the object
Product someProduct = someObjectContext.Product.First();

//At runtime at some point, recreate the ObjectContext
someObjectContext = new SomeObjectContext();

//Try to refresh someProduct on the new ObjectContext
someObjectContext.Refresh(RefreshMode.StoreWins, someProduct);

When the third line executes, it throws an exception:

The element at index 0 in the collection of objects to refresh has a null EntityKey property value or is not attached to this ObjectStateManager.

Is this the correct way to refresh the EntityObject on a newly create ObjectContext?

EDIT:

The reason for new ObjectContext is to refresh all the dirty EntityObjects.

Answer 1

First attach the entity to the context before refresh,

someObjectContext.Products.Attach(someProduct);

or

someObjectContext.Set<Product>().Attach(someProduct);

That should do it.