线程（1）

异步线程：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
//添加引用
using System.Threading;
namespace ConsoleApp2
{
    class Program
    {
        //异步线程
        static void Main(string[] args)
        {
            //第一个线程
            Thread thread1 = new Thread(()=> 
            {
                for (int i = 0; i < 10; i++)
                {
                Console.WriteLine(i);
                Thread.Sleep(1000);
                }

            });
            thread1.IsBackground = true;
            thread1.Start();

            //第二个线程
            Thread thread2 = new Thread(()=>
            {
                for (int i = 10; i < 20; i++)
                {
                    Console.WriteLine(i);
                    Thread.Sleep(1000);
                }

            });
            //设置为后台线程,应用关闭后台线程就关闭
            thread2.IsBackground = true;
            thread2.Start();
            
            Console.ReadLine();
        }
    }
}