C#List 排序

public class Book
    {
        private string name;
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        private int year;
        public int Year
        {
            get { return year; }
            set { year = value; }
        }
        private int price;
        public int Price
        {
            get { return price; }
            set { price = value; }
        }
        public Book(string name,int year, int price)
        {
            Name = name;
            Year = year;
            Price = price;
        }
    }

public class ComparableBookPriceInc : IComparer<Book>
    {
        public int Compare(Book b1, Book b2)
        {
            return b1.Price.CompareTo(b2.Price);
        }
    }

 public class ComparableBookYearInc : IComparer<Book>
    {
        public int Compare(Book b1, Book b2)
        {
            return b1.Year.CompareTo(b2.Year);
        }
    }

 static void Main(string[] args)
        {
            List<Book> listBook = new List<Book>();
            listBook.Sort(new ComparableBookPriceInc());
            listBook.Sort(new ComparableBookYearInc());
         }