Question

Let’s say we have a view V1 and V2 that is declared like:

create view V2 as
select V1.*, V2.C1, V2.C2, V2.C3
from V1
join V2 on V1.Key = V2.Key
where bla-bla

So V2 narrows down the result set of V1 and adds some joins. And there is a retrieval routine in C#

IEnumerable<V1> GetData(MyFilter filter, MySortOrder order) {}

I want to reuse with V2. Is it possible without performing joins in L2S rather than in database? Should i manually create a base class in the database context or something?

Answer 1

Ended up with creating an interface that contains properties of V1 and then inheriting V1 and V2 declarations (generated with sqlmetal.exe) from it (thanks to partial classes!):

public interface IV {
    int P1 {get;set;}
    int P2 {get;set;}
}

public partial class V1: IV { }
public partial class V2: IV { }

then modified GetData():

IEnumerable<IV> GetData(Func<MyDataContext, IEnumerable<IV>> MyFilter filter, MySortOrder order) {}

so i can pass either myDataContext.V1 or myDataContext.V2 entity sets in and cast the result. Do not know if it’s best solution but it’s DRY and I’m happy.