Cast linq results to List

Question

I have extended my entities to implement specific interfaces for its type. I am trying to perform the following query:

 var results = from x in context.MyEnt         


        

Answer 1

You can do the cast on the client, bypassing the entity framework query translation layer by calling AsEnumerable extension method:

return results.Any()
       ? results.AsEnumerable().Cast().ToList() 
       : null;

However, it's better to reverse the order of doing the Count check:

var list = results.AsEnumerable().Cast().ToList();
return list.Count == 0 ? null : list;