using (var context = new TestDBEntities())

{

    var query = from p in context.Parents

                where p.Name == "Lingzhi"

                select p;

    ObjectQuery<Parent> parents = query as ObjectQuery<Parent>;

    if (parents != null)

    {

        string sql = parents.ToTraceString();

    }

}

            LckDbContext ef = new LckDbContext();

            var personInfo = from a in ef.Persons.Include("Photo")

                             select a;

            Console.WriteLine(personInfo.ToString());