C# 泛型相关.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Collections.Specialized;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            ArrayList myList = new ArrayList(20);
            myList.Add(20);  //装箱操作.

            myList.Add(202);

            int i1 = (int)myList[0];  //拆箱操作

            foreach (int item in myList)
            { 
                Console.WriteLine(item);  //这个程序是关于ArrayList的.
            }

            List<int> myListT = new List<int>(10);
            myListT.Add(412);    //不会装箱操作

            int i2 = myListT[0];   //不会拆箱.

            foreach (int item in myListT)
            {
                Console.WriteLine(item);
            }
            //值得注意的是，如果在附值的时候有不同类型进去，但是用foreach循环的时候就会报错，
            //用泛型可以避免这种情况。在编译的时候就会报错.
           

          

        }
        public class MyOK  //下面是泛型的几个例子
        {
            public delegate void EventHandler<TEventArgs>(object sender, TEventArgs e);

            public delegate TOutput Converter<TOutput, TIntput>(TIntput from);

           
        }
        public class SortedList<Tkey, Tvalue>
        {
 
        }

    }

}

//////////////////////////////////////////////////////////////////////////////////////

//以下是另外一个例子。关于List<T>的FindAll方法和Find//

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Collections.Specialized;

namespace 泛型
{
    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 string.Format("Name:{0,-20}Car:{1}", Name, Car);
        }
       
    }

    public class MainRun
    {
        static void Main()
        {
            List<Racer> racers = new List<Racer>();
            racers.Add(new Racer("张三","奥迪"));
            racers.Add(new Racer("李四", "烂车子"));

            //foreach (Racer item in racers)
            //{
            //    Console.WriteLine(item);
            //}
            FindRacer finder = new FindRacer("奥迪");

            foreach (Racer item in racers.FindAll(new Predicate<Racer>(finder.DrivingCarPredicate)))  //这是泛型的List的FindAll.
            {
                Console.WriteLine(item);
            }
           
          

        }

    }

    public class FindRacer
    {
        private string car;
        public FindRacer(string car)
        {
            this.car = car;

        }

        public bool DrivingCarPredicate(Racer racer)
        {
            return racer.Car == car;
        }
    }

}