using System;using System.Collections;using System.Collections.Generic;using System.Diagnostics;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ListDemo{    class Program    {        static void Main(string[] args)        {            Console.WriteLine("开始测试ArrayList:");            TestBegin();            TestArrayList();            TestEnd();            Console.WriteLine("开始测试List<T>:");            TestBegin();            TestGenericList();            TestEnd();            Console.Read();        }        static int collectionCount = 0;        static Stopwatch watch = null;        private static int testCount = 10000000;        static void TestBegin()        {            GC.Collect();//强制对所有代码进行即时垃圾回收            GC.WaitForPendingFinalizers();//挂起线程,执行终结器队列中的终结器(析构方法)            GC.Collect();//再次对所有代码进行垃圾回收,主要包括从终结器队列中出来的对象            collectionCount = GC.CollectionCount(0);//返回在0代中执行的垃圾回收次数            watch = new Stopwatch();            watch.Start();        }        static void TestEnd()        {            watch.Stop();            Console.WriteLine("耗时:" + watch.ElapsedMilliseconds);            Console.WriteLine("垃圾回收次数:"+(GC.CollectionCount(0)-collectionCount));        }        static void TestArrayList()        {            ArrayList al = new ArrayList();            int temp = 0;            for (int i = 0; i < testCount; i++)            {                al.Add(i);                temp = (int) al[i];            }            al = null;        }        static void TestGenericList()        {            List<int> listT = new List<int>();            int temp = 0;            for (int i = 0; i < testCount; i++)            {                listT.Add(i);                temp = listT[i];            }            listT = null;        }    }}