CODEWITHSUNDEEP
c#.netentity-framework
Willem
Willem

Reputation: 9476

How to refresh and entity object after a newly created object context

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.

Upvotes: 5

Views: 5859

Answers (3)

Ajar
Ajar

Reputation: 162

You should attach the some product with object, then only you can refresh the object.

This refresh is used for refreshing the previously created cache related to object content.

I have used the following code in project. It working fine.

objectContext.attach(someProduct);

Upvotes: 0

Stefano Altieri
Stefano Altieri

Reputation: 4628

Since the someProduct was retrieved using a different ObjectContext you need to use someObjectContext.Attach(someProduct).

The refresh is used to refresh the cache of the ObjectContext, It needs an entity selected from the same Object Context.

Good luck

Upvotes: 1

Quinton Bernhardt
Quinton Bernhardt

Reputation: 4803

First attach the entity to the context before refresh,

someObjectContext.Products.Attach(someProduct);

or

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

That should do it.

Upvotes: 3

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