将实体框架实体集合从DAL传递到业务层的最佳方法是什么？

I have a DAL that makes calls to my Entity Framework Model. The calls return things like IOrderedQueryable and IQueryable objects. Should I convert them to something more universal in my DAL, such as List? But I assume that if I don't need to enumerate through the entire collection, this could be wasteful... So whats the best approach? Just have the DAL return the IQueryable<> and convert it when I need to? Or is there something else more flexible? Thanks in Advance.I have a DAL that makes calls to my Entity Fram