EF 多表联查方法

两个表的linq 
        private DataContext dc;

         dc = new DataContext();

 var heji = (from da in dc.q1
                              join du in dc.q2
                              on da.danhao equals du.danhao
                              where da.Name == "XXXX"
                              select new { du.id,  da.name, da.age, du.birthday, du.school }).Distinct();