去掉重复的数据请高手帮

去除重复的数据请高手帮
            IQueryable<KaoQingGuanLi> queryData1 = repository.DaoChuData(db, order, sort, search);
            var queryData= from a in queryData1
                from b in a.YuanGongXingXi
                from c in b.SysDepartment
                where c.Id==DepId
                orderby a.ShiJia
                select a;



[解决办法]
queryData = queryData.GroupBy(x => new {x.备注, x.员工信息}).Select(x => x.First())