Get the max. value in List of objects

Question

I have the following classes.

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; }

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

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

Answer 1

Use Enumerable.Max:

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

---

If RoomPriceDetails could be null, then:

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

Or

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