Attach entities from Server Method result

Do you have an example to the techniques suggested?

I have some questions about this topic

1.- SBelini wrote "The reason I am insisting on using the ECS it because that's one of the reasons the ECS is there for", i think that the wiki should be suggest in the remote server topics that using ECS is the recomended way to return object results.

2.- How can i to return or send to/from remote server methods only the modified or new objects in the cache?

3.- resuming, how can i merge the results to the client cache without use ECS?

thanks.

1.) The server method should return an object array of size 4.   One slot for the ECS and the other 3 for a list of entityKeys.  I could also use a wrapper class instead of the array.

2.) In SL client,  I would use InvokeServerMethodOperation's Result property, which contains the object array (indexes 0,1,2 are list of entityKeys; index 3 is the ECS), to restore the ECS into the EntityManager and, for each list of entityKeys, I would call EntityManager.FindEntity(EntityKey ek) so I can build up the  list of entities.  

Is there a better approach for this scenario?

I am using the same method for a web application, where I don't want the entitycachestate, just my wrapper class back.

As in my SL client using my wrapper, is it considered "ok" to have entities in unchanged state but without entity manager assigned?  It is somehow confusing, these entities should have detached states.

Guillermo

I am attaching you an example project.

In the SL client, I want to attach both  TerritoryA and TerritoryB entities to the current manager.  Both entities are in unchanged state, but their EntityManager properties are set to NULL.     I have preloaded the Region entities before calling the server method (I have excluded region with id=1).   After calling the server method and getting its response in the Sl client,  TerritoryA has associated a region with id=1, so when attaching it to the current manager the exception is not thrown.  But, as TerritoryB has a region which is already in the entity manager's cache, when using Attach method the exception is thrown. 

Hi.

I have a Silverlight Client which invokes a server method using InvokeServerMethodAsync from the Entity Manager.

This server methods returns the custom class "CustomWrapper", which has 3 properties: Description (string), ItemA, ItemB.  Both ItemA and ItemB are of type CustomEntity which belongs to my devforce model.

My issue here is that in the client callback the CustomEntity properties (ItemA and ItemB) are filled with detached entities.  I want to know the best way to attach these entities into my entity manager without getting exceptions like  "key already in the cache"

Right know, i have in my callback:

var tr = (CustomWrapper)args.Result; var ce= em.FindEntity(tr.ItemA.EntityAspect.EntityKey, true) as CustomEntity;  if (ce== null)   em.AttachEntity(tr.ItemA);

Keep in mind that ItemA may have navigation or relatedList properties filled with other entities, and using "AttachEntity" will cause the "already key in the cache" exception.  Do I have to go all the ItemA graph tree to check and add entities?

I don't want to use CacheStateManager to restore cache  from the server result, as I use the method  in other type of client(web) so don't really need it.

Regards,

Guillermo