泛型List<T>使用示例

代码来源于"c#高级编程(第4版)"，略作修改：

  1using System;
  2using System.Collections;
  3using System.Collections.Generic;
  4using System.Text;
  5
  6
  7namespace Wrox.ProCSharp.VectorAsCollection
  8{
  9    class MainEntryPoint
 10    {
 11        static void Main(string[] args)
 12        {
 13
 14            List<Racer> racers = new List<Racer>();
 15            racers.Add(new Racer("Michael Schumacher", "Ferriai"));
 16            racers.Add(new Racer("Juan Pablo Montoya", "McLaren-Mercedes"));
 17            racers.Add(new Racer("Kimi Railkkonen", "McLaren-Mercedes"));
 18            racers.Add(new Racer("Mark Webber", "Williams-BMW"));
 19            racers.Add(new Racer("Rubens Barichello", "Ferriai"));
 20
 21            //遍历List
 22            foreach (Racer R in racers)
 23            {
 24                Console.WriteLine(R);
 25            }
 26
 27            Console.WriteLine("\n----------FindAll Method Demo-------------\n");
 28
 29            //查找findAll
 30            FindRacer finder = new FindRacer("Ferriai");
 31            foreach (Racer r in racers.FindAll(new Predicate<Racer>(finder.DrivingCarPredicate)))//Predicate是一个泛型的委托
 32            //foreach (Racer r in racers.FindAll(new Predicate<Racer>(FindFerriai)))//就本例而言，查找开Farriai的Racer，也可以这样写，但这样不灵活，没办法将参数传入委托
 33            {
 34                Console.WriteLine(r);
 35            }
 36
 37            Console.WriteLine("\n----------Find Method Demo-------------");
 38            //Find方法(若找到的结果不止一条时，显示第一条)
 39            FindRacer f2 = new FindRacer("McLaren-Mercedes");
 40
 41            Racer R2 = racers.Find(new Predicate<Racer>(f2.DrivingCarPredicate));
 42
 43            if (R2 != null)
 44            {
 45                Console.WriteLine(R2);
 46            }
 47            else
 48            {
 49                Console.WriteLine("No racer drive McLaren-Mercedes ");
 50            }
 51
 52            Console.WriteLine("\n----------FindLast Method Demo-------------");
 53            FindRacer f3 = new FindRacer("McLaren-Mercedes");
 54
 55            Racer R3 = racers.FindLast(new Predicate<Racer>(f2.DrivingCarPredicate));
 56
 57            if (R3 != null)
 58            {
 59                Console.WriteLine(R3);
 60            }
 61            else
 62            {
 63                Console.WriteLine("No racer drive McLaren-Mercedes ");
 64            }
 65
 66            Console.ReadLine();
 67        }
 68
 69
 70        //static bool FindFerriai(Racer R)
 71        //{
 72        //    return R.Car == "Ferriai";
 73        //}
 74
 75
 76    }
 77
 78
 79    /**/
 80    /// <summary>
 81    /// 查找Racer的类(根据car查找)
 82    /// </summary>
 83    public class FindRacer
 84    {
 85        private string _car;
 86        public FindRacer(string car)
 87        {
 88            this._car = car;
 89        }
 90
 91        public bool DrivingCarPredicate(Racer r)
 92        {
 93            return r.Car == _car;
 94        }
 95    }
 96
 97    /**/
 98    /// <summary>
 99    /// Racer类
100    /// </summary>
101    public class Racer
102    {
103        private string _name;
104        public string Name
105        {
106            get
107            {
108                return _name;
109            }
110        }
111
112        private string _car;
113        public string Car
114        {
115            get
116            {
117                return _car;
118            }
119        }
120
121        public Racer(string name, string car)
122        {
123            this._name = name;
124            this._car = car;
125        }
126
127        public override string ToString()
128        {
129            return _name + "," + _car;
130        }
131
132    }
133}

运行结果:

Michael Schumacher,Ferriai
Juan Pablo Montoya,McLaren-Mercedes
Kimi Railkkonen,McLaren-Mercedes
Mark Webber,Williams-BMW
Rubens Barichello,Ferriai

----------FindAll Method Demo-------------

Michael Schumacher,Ferriai
Rubens Barichello,Ferriai

----------Find Method Demo-------------
Juan Pablo Montoya,McLaren-Mercedes

----------FindLast Method Demo-------------
Kimi Railkkonen,McLaren-Mercedes