IComparable<>,IFormattable,IEnumerable<>接口使用

1 Racer类

    [Serializable]
    public class Racer : IComparable<Racer>, IFormattable
    {   
                
        public Racer(string firstName = null, string lastName = null, string country = null,
            int starts = 0, int wins = 0, IEnumerable<int> years = null, IEnumerable<string> cars = null)
        {
            this.FirstName = firstName;
            this.LastName = lastName;
            this.Country = country;
            this.Starts = starts;
            this.Wins = wins;
            var yearList = new List<int>();
            foreach (int year in years)
            {
                yearList.Add(year);
            }
            this.Years = yearList.ToArray();

            var carList = new List<string>();
            foreach (string car in cars)
            {
                carList.Add(car);
            }
            this.Cars = carList.ToArray();
        }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Country { get; set; }
        public int Starts { get; set; }
        public int Wins { get; set; }
        public int[] Years { get; private set; }
        public string[] Cars { get; private set; }

        public int CompareTo(Racer r)
        {
            if (r == null) throw new ArgumentNullException("r");
            return this.LastName.CompareTo(r.LastName);
        }

        public override string ToString()
        {
            return string.Format("{0} {1}", FirstName, LastName);
        }

        public string ToString(string format)
        {
            return ToString(format, null);
        }

        public string ToString(string format, IFormatProvider formatProvider)
        {
            switch (format)
            {
                case "L":
                    return LastName;
                case "F":
                    return FirstName;
                case "C":
                    return Country;
                case "W":
                    return Wins.ToString();
                case "S":
                    return Starts.ToString();
                default:
                    throw new FormatException(string.Format("format:{0} not supported!", format));
            }
        }
    }

2 Team类

    public class Team
    {
        public Team(string name, params int[] years)
        {
            this.Name = name;
            this.Years = years;
        }

        private string Name { get; set; }
        private int[] Years { get; set; }
    }

3 初始化

            Racer racer = new Racer("Nino", "Farina", "Italy", 33, 5,
                new int[] { 1950 }, new string[] { "Alfa Romeo", "Maserati" });
            Team team1 = new Team("Vanwall", 1955);
            Team team2 = new Team("Cooper", 1959, 1960);