Question

I have two entity sets with entities of the same name with properties of the same name. Hence:

 FormsEntities formEntities2011 = new FormsEntities2011();
 FormsEntities formEntities2010 = new FormsEntities2010();

And I have queries for each:

 // -- Get a list of Clients from the 2010 Database for this agent
 var clients2010Query = from c in formsEntities2010.Clients
                        join ac in formsEntities2010.Agent_Client on c.Client_ID equals ac.Client_ID
                        where ac.Agent_ID == a.Agent_ID
                        orderby c.Client_ID
                        select c;

But I get an error on the join statement regarding ambiguity between Clients. I believe this is because the formEntities2011 and the formEntities2010 both have a Client entity.

Normally I would just add the namespace to resolve the ambiguity, but I don’t know how to do that in a Linq statement?

The error is “The member is defined more than once” on c.Client_ID and ac.Client_ID

Answer 1

If you want to explicitly assign a type, try using extension methods and Cast.

var c2010 = formsEntities2010.Clients
                .Join( formsEntities1010.Agent_Client
                                        .Where( ac => ac.Agent_ID == a.Agent_ID ),
                       c => c.Client_ID,
                       ac => ac.Client_ID,
                       (c,ac) => c )
                .Cast<Forms2010.Client>(); // or whatever namespace you choose

I would be surprised, though, if this affected your problem since it seems to me that it is having difficulty determining which fields to use as the join keys.