private static IQueryable <Book> BookEagerFetch(AbstractRepository repo)
{
var books = repo.EntitySet <Book>();
var categories = repo.EntitySet <Category>();
var formats = repo.EntitySet <Format>();
var outerJoin = from b in books
join c in categories on b.Category.Id equals c.Id into gs
from g in gs.DefaultIfEmpty()
join f in formats on b.Format.Id equals f.Id into gj
from h in gj.DefaultIfEmpty()
select new Book
{
Id = b.Id,
Title = b.Title,
Isbn = b.Isbn,
Category = g,
Format = h
};
return(outerJoin);
}
