0

我想优雅地为每对独特的情侣（出发时间、到达时间、旅行舱位）选择，价格较低的最佳记录在表中以粗体显示。

这是给我带来结果行的代码下方。

tripRepository.FindBy(x => x.SearchID == id).Include(b => b.Results)


- DepartureTime          ArrivalTime            TravelClass  Price 
====================================================================================

- 01/08/2013 09:13:00    01/08/2013 10:14:00     economy    4700
- 01/08/2013 09:13:00    01/08/2013 10:14:00     first      8300
- 01/08/2013 09:13:00    01/08/2013 10:14:00     economy    2750
- **01/08/2013 09:13:00  01/08/2013 10:14:00     first      3600**
- **01/08/2013 09:13:00  01/08/2013 10:14:00     economy    2000**
- 01/08/2013 10:11:00    01/08/2013 11:14:00     economy    4700
- 01/08/2013 10:11:00    01/08/2013 11:14:00     first      8300
- 01/08/2013 10:11:00    01/08/2013 11:14:00     economy    2750
- 01/08/2013 10:11:00    01/08/2013 11:14:00     first      2950
- **01/08/2013 10:11:00  01/08/2013 11:14:00     economy    2000**
- **01/08/2013 10:11:00  01/08/2013 11:14:00     first      2800**

非常感谢你

4

3 回答 3

2 
.GroupBy(m => new {
   m.DepartureTime,
   m.ArrivalTime,
   m.TravelClass
})
.Select(g  => g.OrderBy(x => x.Price).First());
于 2013-05-15T14:41:46.440 回答
0

以我在此处发布的相同方式：https ://stackoverflow.com/a/16567385/2385557

尝试这个 ：

public class Test
{
    public void Exec()
    {
        var items = new List<Item>{ 
        new Item { DepartureTime = "01/08/2013 09:13:00", ArrivalTime = "01/08/2013 10:14:00", TravelClass="economy" , Price =        4700 },
        new Item { DepartureTime = "01/08/2013 09:13:00", ArrivalTime = "01/08/2013 10:14:00", TravelClass="first"   , Price =        8300 },
        new Item { DepartureTime = "01/08/2013 09:13:00", ArrivalTime = "01/08/2013 10:14:00", TravelClass="economy" , Price =        2750 },
        new Item { DepartureTime = "01/08/2013 09:13:00", ArrivalTime = "01/08/2013 10:14:00", TravelClass="first"   , Price =        3600 },
        new Item { DepartureTime = "01/08/2013 09:13:00", ArrivalTime = "01/08/2013 10:14:00", TravelClass="economy" , Price =        2000 },
        new Item { DepartureTime = "01/08/2013 10:11:00", ArrivalTime = "01/08/2013 11:14:00", TravelClass="economy" , Price =        4700 },
        new Item { DepartureTime = "01/08/2013 10:11:00", ArrivalTime = "01/08/2013 11:14:00", TravelClass="first"   , Price =        8300 },
        new Item { DepartureTime = "01/08/2013 10:11:00", ArrivalTime = "01/08/2013 11:14:00", TravelClass="economy" , Price =        2750 },
        new Item { DepartureTime = "01/08/2013 10:11:00", ArrivalTime = "01/08/2013 11:14:00", TravelClass="first"   , Price =        2950 },
        new Item { DepartureTime = "01/08/2013 10:11:00", ArrivalTime = "01/08/2013 11:14:00", TravelClass="economy" , Price =        2000 },
        new Item { DepartureTime = "01/08/2013 10:11:00", ArrivalTime = "01/08/2013 11:14:00", TravelClass="first"   , Price =        2800 },

    };

        var result = items
                        .GroupBy(groupedItems => new { groupedItems.DepartureTime, groupedItems.ArrivalTime, groupedItems.TravelClass })
                        .SelectMany(i => items
                                             .Where(innerItem =>
                                                                    (innerItem.DepartureTime == i.Key.DepartureTime
                                                                    && innerItem.ArrivalTime == i.Key.ArrivalTime
                                                                    && innerItem.TravelClass == i.Key.TravelClass)
                                                                    && innerItem.Price == i.Min(ii => ii.Price))
                                             .Select(innerItem => innerItem)
                                             );

        foreach (var item in result)
            Console.WriteLine("Cheapest flight with departure at {0}, arrival at {1} and in travel class {2} costs {3}", item.DepartureTime, item.ArrivalTime, item.TravelClass, item.Price);

    }

    private class Item
    {
        public String DepartureTime { get; set; }
        public String ArrivalTime { get; set; }
        public String TravelClass { get; set; }
        public Int32 Price { get; set; }
    }

}

输出给出：

2013 年 1 月 8 日 09:13:00 出发，2013 年 1 月 8 日 10:14:00 到达的最便宜的航班，经济舱票价为 2000

2013 年 1 月 8 日 09:13:00 出发，2013 年 1 月 8 日 10:14:00 抵达的最便宜航班，头等舱票价 3600

2013 年 1 月 8 日 10:11:00 出发，2013 年 1 月 8 日 11:14:00 到达的最便宜航班，经济舱旅行费用为 2000

2013 年 1 月 8 日 10:11:00 出发，2013 年 1 月 8 日 11:14:00 抵达的最便宜航班，头等舱票价 2800

于 2013-05-15T15:35:14.790 回答
0

您应该能够执行以下操作：

var result = yourRepo.OrderBy(p => p.Price)
                     .ThenBy(n => n.Name)
                     .Take(stuff.Select(q => q.Name)
                                .Distinct()
                                .Count());
于 2013-05-15T14:37:00.310 回答