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  public static void Main(string[] args){

  Action<int,int> a=add;
  a.BeginInvoke(3,4,null,null);//前两个是add方法的参数,后两个可以为空
  Console.WriteLine("main()");
  Console.ReadKey();
 }
 static void add(int a,int b){
  Console.WriteLine(a+b);
 }

运行结果:

如果不是开启线程,像平常一样调用的话,应该先输出7,再输出main()

二、通过thread类开启线程

    using System;
        using System.Threading;
         public static void Main(string[] args){
  Thread t=new Thread(DownLoadFile_My);//创建了线程还未开启
  t.Start("http://abc/def/**.mp4");//用来给函数传递参数,开启线程
  Console.WriteLine("main()");
  Console.ReadKey();
 }
 //thread开启线程要求:该方法参数只能有一个,且是object类型
 static void DownLoadFile_My(object filePath){
  Console.WriteLine("开始下载:"+filePath);
  Thread.Sleep(2000);
  Console.WriteLine("下载完成!");
 }

运行结果:

三、通过线程池开启线程

 public static void Main(string[] args){
  ThreadPool.QueueUserWorkItem(DownLoadFile_My);
  ThreadPool.QueueUserWorkItem(DownLoadFile_My);
  ThreadPool.QueueUserWorkItem(DownLoadFile_My);
  ThreadPool.QueueUserWorkItem(DownLoadFile_My);
  ThreadPool.QueueUserWorkItem(DownLoadFile_My);
  ThreadPool.QueueUserWorkItem(DownLoadFile_My);
  ThreadPool.QueueUserWorkItem(DownLoadFile_My);
  ThreadPool.QueueUserWorkItem(DownLoadFile_My);
  ThreadPool.QueueUserWorkItem(DownLoadFile_My);
  Console.WriteLine("main()");
  Console.ReadKey();
 }
 static void DownLoadFile_My(object state){
  Console.WriteLine("开始下载...  线程ID:"+Thread.CurrentThread.ManagedThreadId);
  Thread.Sleep(2000);
  Console.WriteLine("下载完成!");
 }

运行结果:

4、通过任务开启线程

1>Task开启线程

using System;
using System.Threading;
using System.Threading.Tasks;
 public static void Main(string[] args){
  Task t=new Task(DownLoadFile_My);
  t.Start();
  Console.WriteLine("main()");
  Console.ReadKey();
 }
 static void DownLoadFile_My( ){
  Console.WriteLine("开始下载...  线程ID:"+Thread.CurrentThread.ManagedThreadId);
  Thread.Sleep(2000);
  Console.WriteLine("下载完成!");
 }

运行结果:

2>TaskFactory开启线程

 public static void Main(string[] args){
  TaskFactory tf=new TaskFactory();
  tf.StartNew(DownLoadFile_My);
  Console.WriteLine("main()");
  Console.ReadKey();
 }
 static void DownLoadFile_My( ){
  Console.WriteLine("开始下载...  线程ID:"+Thread.CurrentThread.ManagedThreadId);
  Thread.Sleep(2000);
  Console.WriteLine("下载完成!");
 }

运行结果:

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