public IActionResult getGiaoVienLopTheoMonHocVaLop([FromBody] GiaoVienMonHocReq req)
        {
            var res = new SingleRsp();
            var gv  = _svc.getGiaoVienLopTheoMonHocVaLop(req);

            res.Data = gv;
            return(Ok(res));
        }
        public object getGiaoVienLopTheoMonHocVaLop(GiaoVienMonHocReq req)
        {
            var gv = All.Join(_rep.Context.GiaoVien, a => a.MaGv, c => c.MaGv, (a, c) => new {
                a.MaGvl,
                a.MaGv,
                a.MaLop,
                c.MaMh,
            }).Where(gv => gv.MaLop == req.MaLop && gv.MaMh == req.MaMh).FirstOrDefault();

            return(gv);
        }