C# 泛型2---排序

     刚才怕写的太多,万一IE来个罢工岂不是白写了,所以还是先保存一下,下面接着学习排序.
3.泛型排序
  List<T>类可以对其元素排序.Sort()方法有几个重载的版本:
  public void List<T>.Sort();
  public void List<T>.Sort(Comparison<T>);
  public void List<T>.Sort(IComparer<T>);
  public void List<T>.Sort(Int32,Int32,IComparer<T>);

无参数的只能在集合中的元素实现了IComparable接口是使用.
Comparison<T>是一个委托,带有两个类型的参数,返回Int,如果参数相等,该方法就返回零,如果第一个小于第二个参数,该方法就返回一个小于0 的值,否则相反.
比较方法可以使用匿名方法,两个参数类型是Racer,在代码中,使用字符串CompareTo()比较Name属性:

            racer.Sort(delegate(Racer r1, Racer r2) { return r1.Name.CompareTo(r2.Name); });

除了使用委托外,ICompare<T>还用于给集合排序.RacerComparer类为Racer类实现了Icompare<T>接口,这个类可以按照名字,和汽车排序:

public class RacerComparer : IComparer<Racer>
    {
        public enum CompareType
        {
            Name,
            Car
        }
        private CompareType compareType;
        public RacerComparer(CompareType compareType)
        {
            this.compareType = compareType;
        }
        public int Compare(Racer x, Racer y)
        {
            int result = 0;
            switch (compareType)
            {
                case CompareType.Name:
                    result=x.Name.CompareTo(y.Name);
                    break;
                case CompareType.Car:
                    result=x.Car.CompareTo(y.Car);
                    break;
            }
            return result;
        }
     }

截止到这里
我吧全部代码发上来

Code
using System;
using System.Collections.Generic;
using System.Text;

namespace ListTest
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Racer> racer = new List<Racer>();
            //添加
            racer.Add(new Racer("张三", "奇瑞"));
            racer.Add(new Racer("李四", "中华"));
            racer.Add(new Racer("王五", "神牛"));
            racer.Add(new Racer("王六", "神牛"));


            foreach (Racer r in racer)
            {
                Console.WriteLine(r);
            }
            Console.WriteLine("****************查找********************");
            FindRacer finder = new FindRacer("神牛");
            foreach (Racer race in racer.FindAll(new Predicate<Racer>(finder.DrivingCarPredicate)))
            {
                Console.WriteLine(race);
            }
            Console.WriteLine("****************输出********************");
            racer.ForEach(delegate(Racer r) { Console.WriteLine(r); });
            Console.WriteLine("****************排序********************");
            racer.Sort(delegate(Racer r1, Racer r2) { return r1.Name.CompareTo(r2.Name); });
            racer.ForEach(delegate(Racer r) { Console.WriteLine(r); });
            Console.WriteLine("****************自定义排序********************");

            racer.Sort(new RacerComparer(RacerComparer.CompareType.Car));
            racer.ForEach(delegate(Racer r) { Console.WriteLine(r); });


        }
    }
    public class FindRacer
    {
        private string car;
        public FindRacer(string car)
        {
            this.car = car;
        }
        public bool DrivingCarPredicate(Racer racer)
        {
            return racer.Car == car;
        }
    }
    public class Racer
    {
        private string name;
        public string Name
        {
            get { return name; }
        }
        private string car;
        public String Car
        {
            get { return car; }
        }

        public Racer(string name, string car)
        {
            this.name = name;
            this.car = car;
        }
        public override string ToString()
        {
            return name + "," + car;
        }
    }
    public class RacerComparer : IComparer<Racer>
    {
        public enum CompareType
        {
            Name,
            Car
        }
        private CompareType compareType;
        public RacerComparer(CompareType compareType)
        {
            this.compareType = compareType;
        }
        public int Compare(Racer x, Racer y)
        {
            int result = 0;
            switch (compareType)
            {
                case CompareType.Name:
                    result=x.Name.CompareTo(y.Name);
                    break;
                case CompareType.Car:
                    result=x.Car.CompareTo(y.Car);
                    break;
            }
            return result;
        }

    }
}