namespace ConsoleApp1

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("正在计算Guid.....");

            Stopwatch stopwatch = new Stopwatch();

            stopwatch.Start();

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

            {

                Guid guid = Guid.NewGuid();

            }

            stopwatch.Stop();

            TimeSpan t = stopwatch.Elapsed;

            string totaltime = String.Format("{0:00}:{1:00}:{2:00}:{3:00}", t.Hours, t.Minutes, t.Seconds, t.Milliseconds);

            Console.WriteLine("使用Guid时，总用时：{0}", totaltime);//2s

            //----------------------------------------------------------------------------------//

            Console.WriteLine("正在计算DateTime.....");

            stopwatch.Start();

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

            {

                DateTime dateTime = DateTime.Now;

            }

            stopwatch.Stop();

            TimeSpan t2 = stopwatch.Elapsed;

            string totaltime2 = String.Format("{0:00}:{1:00}:{2:00}:{3:00}", t2.Hours, t2.Minutes, t2.Seconds, t2.Milliseconds);

            Console.WriteLine("使用DateTime时，总用时：{0}", totaltime2);//3s

            Console.ReadKey();

        }

    }

}