ArrayList arrInt = new ArrayList();

                 //用stopwatch来计时 运行的时间

             Stopwatch watch = new Stopwatch();

             watch.Start();

             for (int i = ; i < ; i++)

             {

                 arrInt.Add(i);

             }

             watch.Stop();

             Console.WriteLine(watch.Elapsed);

             Console.ReadKey();

            // 使用泛型集合避免装箱和拆箱。

             List<int> arrInt1 = new List<int>();

             Stopwatch watch2 = new Stopwatch();

             watch2.Start();

             for (int i = ; i < ; i++)

             {

                 arrInt1.Add(i);

             }

             watch2.Stop();

             Console.WriteLine(watch.Elapsed);

             Console.ReadKey();