c#Parallel.ForEach

  List<int> listI = new List<int>();
                for (int i = 0; i < 1000; i++)
                {
                    listI.Add(i);
                }

Parallel.ForEach(listI, x => Dosome("Exec:" + x));


 public static void Dosome(string str)
        {
            Thread.Sleep(1000);
            Console.WriteLine(str + "datetime.now" + DateTime.Now);
        }

Parallel.ForEach启动的线程数量取决于您拥有的内核数量以及已经忙碌的内核数量.