Question

I have a class Something that implements ISomething. How can I convert/cast from an IQueryable<Something> to an IQueryable<ISomething>. When I try to cast, I am able to compile, but the result of the cast is always NULL.

Background: The reason I am doing this is because my Something class is a CodeSmith-generated class (PLINQO template) that has table mapping decoration, methods, etc. My ISomething interface is “POCO-style”, in that it is dumb and simply mirrors the properties of the Something class. It also exists in it’s own namespace. I am doing this so I don’t have to reference the assembly that holds the Something class from my service layer. The assembly that holds the Something class will only need to be referenced in my repository layer now.

Answer 1

You can use LINQ method Cast

 IQueryable<Something> something = ...
 IQueryable<ISomething> casted = something.Cast<ISomething>();