泛型

Stopwatch sw = new Stopwatch();
            sw.Start();
            var list = new ArrayList();
            int temp;
            for (int i = 0; i < 1000000; i++)
            {
                list.Add(i);
                temp = (int)list[i];
            }
            list = null;
           
            sw.Stop();          
            Console.WriteLine(sw.ElapsedMilliseconds.ToString());
            sw = null;

Stopwatch sw = new Stopwatch();
            sw.Start();
            var list = new List<>();
            int temp;
            for (int i = 0; i < 1000000; i++)
            {
                list.Add(i);
                temp = list[i];
            }
            list = null;
           
            sw.Stop();          
            Console.WriteLine(sw.ElapsedMilliseconds.ToString());
            sw = null;