开启线程的四种方式

一、异步委托开启线程

        static void Main(string[] args)
        {
            Action<int, int> a = add;
            a.BeginInvoke(3, 4, null,null);
            Console.WriteLine("main()");
            Console.ReadKey();
        }
        static void add(int a, int b)
        {
            Console.WriteLine(a + b);
        }

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！");
		}

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！");
		}

四、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！");
		}

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！");
		}