C#并行和多线程编程

参考：https://www.cnblogs.com/yunfeifei/p/3993401.html 和 https://www.cnblogs.com/rjjs/p/5583722.html  推荐使用TPL 

C# TPL(Task Parallel Library)和PLINQ(Parallel LINQ) 并行编程 是.Net4 为多线程编程引入的新的API

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
           
                // create the task
                Task<int> task1 = new Task<int>(() =>
                {
                    //耗时操作
                    System.Threading.Thread.Sleep(2000);
                    int sum = 0;
                    for (int i = 0; i < 100; i++)
                    {
                        sum += i;
                    }
                    return sum;
                });

                task1.Start();
                Task.Factory.StartNew(() =>
                {
                    //耗时操作
                    System.Threading.Thread.Sleep(1000);
                    Console.WriteLine("task2在task1之后启动，先完成");
                });
                // write out the result
                Console.WriteLine("此处开始于task1.Start和之后task2，却显示在最前面");
                Console.WriteLine("Result 1: {0}", task1.Result);

                Console.ReadLine();
            
        }
    }
}