1 static void Main(string[] args)

 2         {

 3             var dt = DateTime.Now;

 4             var rand = new Random(DateTime.Now.Millisecond);

 5             for (int i = 0; i < 20; i++)

 6             {

 7                 Thread.Sleep(rand.Next(100, 1000));

 8             }

 9             var standerTime = (DateTime.Now - dt).TotalMilliseconds;

10             Console.WriteLine("标准的for循环，耗时{0}毫秒", standerTime);

11             dt = DateTime.Now;

12             Parallel.For(0, 20, i =>

13             {

14                 Thread.Sleep(rand.Next(100, 1000));

15             });

16             var parallelTime = (DateTime.Now - dt).TotalMilliseconds;

17             Console.WriteLine("并行的for循环，耗时{0}毫秒", parallelTime);

18             Console.WriteLine();

19             if (standerTime <= parallelTime)

20             {

21                 Console.WriteLine("----------标准的for循环节省{0}毫秒----------", (parallelTime - standerTime));

22             }

23             else

24             {

25                 Console.WriteLine("----------并行的for循环节省{0}毫秒----------", (standerTime - parallelTime));

26             }

27             Console.ReadKey();

28         }