public class ListSpr_ZakComparer : IEqualityComparer<ITableKay>
    {

        public bool Equals(ITableKay x, ITableKay y)
        {
            return (x.FK_Filial == y.FK_Filial && x.FK_Table == y.FK_Table);
        }

        public int GetHashCode(ITableKay obj)
        {
            return obj.FK_Table.GetHashCode();
        }
    }

          var list_req = q
                .Join(
                (m_dc.ListSpr.Join(m_dc.GetTable<UsrList>().AsEnumerable(), x => x.FK_UserList, y => y.CodeUser, (x, y) => new{x,y}).AsEnumerable())
                ,

                 x => (ITableKay )x,
                 y => (ITableKay )y.x,

                 (x, y) =>
                    new 
                    {
                        x,y
                    }
                    , new ListSpr_ZakComparer()
                ).ToList();
            return list_req;