Question

I’m new to .NET. I’m trying to do something very simple.
I would like to perform a search on a Model in my controller and retrieve the first entity returned :

var cercueils = from y in db.Cercueils select y;
cercueils = cercueils.Where(z => z.Type.ToUpper().Contains(dr[13].ToUpper())
          || z.AncienType.ToUpper().Contains(dr[13].ToUpper()));
Cercueil cercueil = cercueils.First();

But this is not good, as it throws an error :

Le type de nœud « ArrayIndex » de l'expression LINQ n'est pas pris en charge dans LINQ to Entities.

(Google translate: “the node type of the LINQ expression arrayIndex n is not supported in LINQ to Entities”)

How can I achieve that ?

Thanks for your help.

Answer 1

I believe Linq doesn’t know how to execute ‘dr[13]’ in the context of deferred execution…
try the following:

var tmp = dr[13].ToUpper();
var cercueils = from y in db.Cercueils select y;
cercueils = cercueils.Where(z => z.Type.ToUpper().Contains(tmp)
          || z.AncienType.ToUpper().Contains(tmp));
Cercueil cercueil = cercueils.FirstOrDefault();

Also, I usually recommend FirstOrDefault with a null check afterwards 🙂