Linq Group By 多个字段

 var counts = dal.QueryStatisticsCount(condition);
            var result =
            from p in counts
            group p by new { AuctionName = p.AuctionName, StatusName = p.StatusName } into g
            select new
            {
                StatusName = g.Key.StatusName,
                Num = g.Sum(c => c.VehicleCount)
            };