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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace ParallelNameSpace
{
    class Program
    {
        static void Main(string[] args)
        {
            int amount = 0;
            List<int> list = new List<int>();
            while (amount < 100000000)
            {
                amount++;
                list.Add(amount);
            }
            Console.WriteLine("继续");

            DateTime startTime = DateTime.Now;

            foreach (var item in list)
            {
                DateTime t = DateTime.Now.AddSeconds(item);
            }//耗时11s


            TimeSpan elapsed = DateTime.Now - startTime;
            Console.WriteLine("完成：" + elapsed);

            Console.WriteLine("使用Parallel");
            startTime = DateTime.Now;
            Parallel.ForEach(list, item =>
                        {
                            DateTime t = DateTime.Now.AddSeconds(item);
                        }
            );//耗时2s
            elapsed = DateTime.Now - startTime;
            Console.WriteLine("完成：" + elapsed);
            Console.ReadKey();

        }
    }
}