C#中开启线程的四种方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
using System.Diagnostics;
using System.Threading;
namespace ConsoleApplication1
{
    class Program
    {
        public delegate int testc(int i);
        public static int test_func(int i)
        {
            Console.WriteLine("Into_test_func "+i);
            return 100;
        }
        class DownLoad
        {
            string path;
            string name;
            public DownLoad(string path,string name)
            {
                this.path = path;
                this.name = name;
            }
            public void DownLoadFile()
            {
                //真要连接网络的话肯定要连接下载服务器的，这里只是演示下线程代码
                Console.WriteLine("Download当前线程ID："+Thread.CurrentThread.ManagedThreadId);
                Console.WriteLine("路径" + path +"文件"+name);
                Thread.Sleep(2000);
                Console.WriteLine("下载完成");
            }
        }
        static void ThreadPoolTest(object obj)
        {
            Console.WriteLine("Into ThreadPoolTest ID:"+Thread.CurrentThread.ManagedThreadId);
            Console.WriteLine("Please Wattting");
            Thread. Sleep(2000);
            Console.WriteLine("OK");
        }
        static void TaskTest()
        {
            Console.WriteLine("任务开始");
            Thread.Sleep(2000);
            Console.WriteLine("任务结束");
        }
        //C#开启线程的几种方法
        static void Main(string[] args)
        {
            /*1.通过委托的方式开启线程
            testc tete = test_func; 
            //用于保存结果的变量，通过lambda实现线程完成后的回调
            IAsyncResult IAsync = tete.BeginInvoke(666,
                (@AsyncResult) => { Console.WriteLine("Into AsyncCallBack" + @AsyncResult.IsCompleted+ tete.EndInvoke(@AsyncResult));},
                null);
            Console.WriteLine("Main");
            Console.ReadKey();*/
            /* 2.使用Thread类开起线程
              DownLoad downloadClass = new DownLoad("https://www.xxxx.com","_666");
              Thread thread = new Thread(downloadClass.DownLoadFile);
              thread.Start();
              Console.WriteLine("Main线程ID："+Thread.CurrentThread.ManagedThreadId);*/
            /*//3.通过线程池的方法开起线程
            ThreadPool.QueueUserWorkItem(ThreadPoolTest);
            ThreadPool.QueueUserWorkItem(ThreadPoolTest);
            ThreadPool.QueueUserWorkItem(ThreadPoolTest);
            Console.WriteLine("Main ID:"+Thread.CurrentThread.ManagedThreadId);
            Console.ReadKey();*/
            //4.通过任务开起线程
            //创建出来的是后台线程,和ThreadPoool有些类似，这里需要注意，如果操作系统检测到没有前台线程，
会关闭进程。
         /*   Task tesk1 = new Task(TaskTest);
            tesk1.Start();
            TaskFactory tf = new TaskFactory();
            tf.StartNew(TaskTest);
            Console.ReadKey();*/
        }
    }
}