c#之为整数键控模型集合寻找优雅/高效的解决方案

“AddToLeg”方法似乎很啰嗦，有没有更好的模式或更有效的方法来实现它？我考虑过使用字典，但我希望键保持整数。我对 linq/generics 还很陌生，所以我可能遗漏了一些更明显的东西。当我查看文档时，实际上没有任何示例符合我的情况。

using System; 
using System.Collections.Generic; 
using System.Linq; 
 
namespace ConsoleApplication1 
{ 
    public class Program 
    { 
        public static void Main() 
        { 
            var model = new TrainspotterItenaryViewModel(); 
 
            var manchester = new Station() { Name = "Manchester", ExpectedTime = "13:30" }; 
            var leeds = new Station() { Name = "Leeds", ExpectedTime = "15:00" }; 
            var york = new Station() { Name = "York", ExpectedTime = "15:30" }; 
            var london = new Station() { Name = "London", ExpectedTime = "21:00" }; 
 
            model.AddToLeg(1, manchester); 
            model.AddToLeg(1, leeds); 
 
            model.AddToLeg(2, leeds); 
            model.AddToLeg(2, london); 
            model.AddToLeg(1, york); //another destination added to leg 1 
 
            //any number of legs can be added... 
            model.AddToLeg(3, manchester); 
 
            //show results contents 
            for(var i=1; i <= model.Legs.Count; i++) 
            { 
                var displayLeg = model.Legs.Single(x=>x.LegNumber==i); 
                foreach(var station in displayLeg.Stations){ 
                    string output = $"leg: {displayLeg.LegNumber} station: {station.Name}, expected:{station.ExpectedTime}"; 
                        Console.WriteLine(output);   
                } 
            } 
        } 
    } 
 
    public class TrainspotterItenaryViewModel 
    { 
        public List<Leg> Legs { get; set; } 
 
        public void AddToLeg(int legNumber, Station station) 
        { 
            if (Legs == null) 
            { 
                Legs = new List<Leg>(); 
            } 
 
            var legCount = Legs.Count(x => x.LegNumber == legNumber); 
            if (legCount == 0) 
            { 
                var leg = new Leg 
                { 
                    LegNumber = legNumber, 
                    Stations = new List<Station> {station} 
                }; 
 
                Legs.Add(leg); 
 
                Console.WriteLine($"Leg {leg.LegNumber} Not Found- Added new leg and {station.Name}"); 
            } 
            else 
            { 
                foreach (var leg in Legs) 
                { 
                    if (leg.LegNumber == legNumber) 
                    { 
                        leg.Stations.Add(station); 
                        Console.WriteLine($"Leg {legNumber} Found- adding {station.Name}"); 
                    } 
                } 
            } 
        } 
    } 
 
    public class Leg 
    { 
        public int LegNumber { get; set; } 
        public List<Station> Stations { get; set; } 
    } 
 
    public class Station 
    { 
        public string Name { get; set; } 
        public string ExpectedTime { get; set; } 
    } 
} 

请您参考如下方法:

为此任务使用字典:

    public class TrainspotterItenaryViewModel 
    { 
        private Dictionary<int, Leg> _legNumberToLegIndex { get; set; } 
 
        public IEnumerable<Leg> Legs => _legNumberToLegIndex?.Values 
 
        public void AddToLeg(int legNumber, Station station) 
        { 
            if (_legNumberToLegIndex == null) 
            { 
                _legNumberToLegIndex = new Dictionary<int, Leg>(); 
            } 
 
            Leg leg; 
            if (!_legNumberToLegIndex.TryGetValue(legNumber, out leg)) 
            { 
                leg = new Leg 
                { 
                    LegNumber = legNumber, 
                    Stations = new List<Station>() 
                }; 
                _legNumberToLegIndex.Add(legNumber, leg); 
            } 
            leg.Stations.Add(station); 
        } 
    }