Can't use .Union with Linq due to

Question

I\'m kind of stuck with that problem. Hope i\'ll get some help. Here\'s the point. I have to fill my DataGridView with that SQL request :

SELECT LOT.NumLot,          


        

Answer 1

The problem is that your anonymous types are not the same type.

One is { ? NumLot, ? EtatLot, string NomEmploye } and the other is { ? NumLot, ? EtatLot, string test }. The last member has a different name hence it is a different type.

Try this instead:

var listeLotControle =
(
    from x in entBoum.LOT
    join aff in entBoum.AFFECTATION_LOT on x.NumLot equals aff.NumLot
    join emp in entBoum.EMPLOYE on aff.IdEmploye equals emp.IdEmploye
    where x.EtatLot.Contains("Libéré") || x.EtatLot.Contains("Suspendu") || x.EtatLot.Contains("Démarré")
    select new { x.NumLot, x.EtatLot, emp.NomEmploye }
).Union
(
    from x in entBoum.LOT
    where x.EtatLot.Contains("Démarré")
    select new { x.NumLot, x.EtatLot, NomEmploye = test }
);

Answer 2

When I only look at your last try I see this:

select new { x.NumLot, x.EtatLot, emp.NomEmploye };

vs.

select new { x.NumLot, x.EtatLot, test };

You can never assign or cast one list of anonymous type to another as long as all their properties do not have equal type and name.

EDIT: Write select new { x.NumLot, x.EtatLot, NomEmploye = test }; for the second one instead.