what is the best practice for selecting extended entities in EF5,

Question

I use linq to entities to query the DB, sometimes I need to bring extra information from the joined tables (without navigational property),I extended the entity to hold the info, my question is how can I set the extra properties without having to remap all it's base properties.

ex

from s in db.t1 
join p in db.t2 on s.indx equals p.indx into ps
from c in ps.DefaultIfEmpty()  
select new t1() { p1 = s.p1, p2 = s.p2 ..., extra = c.extra }

so can I set just the 'extra' value in a fast way !

Answer 1

Why can't you just use an anonymous object?

from s in db.t1 
join p in db.t2 on s.indx equals p.indx into ps
from c in ps.DefaultIfEmpty()  
select new
{ 
    p1 = s.p1, 
    p2 = s.p2,
    extra = c.extra 
}