C# Parallel类For循环与普通For循环耗时性能比较

static void Main(string[] args)
        {
            var dt = DateTime.Now;
            var rand = new Random(DateTime.Now.Millisecond);
            for (int i = 0; i < 20; i++)
            {
                Thread.Sleep(rand.Next(100, 1000));
            }
            var standerTime = (DateTime.Now - dt).TotalMilliseconds;
            Console.WriteLine("标准的for循环，耗时{0}毫秒", standerTime);
            dt = DateTime.Now;
            Parallel.For(0, 20, i =>
            {
                Thread.Sleep(rand.Next(100, 1000));
            });
            var parallelTime = (DateTime.Now - dt).TotalMilliseconds;
            Console.WriteLine("并行的for循环，耗时{0}毫秒", parallelTime);
            Console.WriteLine();
            if (standerTime <= parallelTime)
            {
                Console.WriteLine("----------标准的for循环节省{0}毫秒----------", (parallelTime - standerTime));
            }
            else
            {
                Console.WriteLine("----------并行的for循环节省{0}毫秒----------", (standerTime - parallelTime));
            }
            Console.ReadKey();
        }