获得最大对象列表中的值 [英] Get the max. value in List of objects

问题描述

我有以下课程.

public class PriceDetails 
{
  public float AverageNightlyRate { get; set; }
}

public class RoomContainer
{
  public PriceDetails RoomPriceDetails { get; set; }
  public string PromotionDescription { get; set; }
}    

public List<RoomContainer> HotelRooms { get; set; }

列表 HotelRooms 有10个项目. 我想找到 AverageNightlyRate 的最大值.

The list HotelRooms has 10 items. I want to find the maximum value of AverageNightlyRate.

我正在使用for循环进行迭代. 我可以高效地做到这一点吗?

I am using for loop to iterate . Can I do it in an efficient manner ?

推荐答案

使用 Enumerable.Max :

var maxAverageRate = HotelRooms.Max(r => r.RoomPriceDetails.AverageNightlyRate)

---

如果RoomPriceDetails可能是null，则:

---

If RoomPriceDetails could be null, then:

var maxAverageRate = HotelRooms.Where(r => r.RoomPriceDetails != null)
                               .Max(r => r.RoomPriceDetails.AverageNightlyRate);

或

var maxAverageRate = HotelRooms.Select(room => room.RoomPriceDetails)
                               .Where(price => price != null)
                               .Max(price => price.AverageNightlyRate);

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