异步 Thread

Threads
最早的版本，微软推荐不要再使用Thread了
thread不支持带返回值的方法
本身也没有线程回调，但是可以自己做一个

private void btnThreads_Click(object sender, EventArgs e)
        {
            Stopwatch watch = new Stopwatch();
            watch.Start();
            Console.WriteLine();
            Console.WriteLine("********************btnThread_Click Start 主线程id={0}********************", Thread.CurrentThread.ManagedThreadId);
            List<Thread> threadList = new List<Thread>();
            for (int i = 0; i < 5; i++)
            {
                ParameterizedThreadStart method = o => TestThreadWithoutReturn(o.ToString());
                Thread thread = new Thread(method);//1. 默认前台线程：程序退出后，计算任务会继续
                thread.IsBackground = true;//2. 后台线程：程序退出，计算理解结束
                thread.Start(string.Format("btnThread_Click_{0}", i));
                threadList.Add(thread);
            }

            //for (int i = 0; i < 5; i++)
            //{
            //    //使用Thread完成多线程回调
            //    int b = i;
            //    ParameterizedThreadStart method = o => TestThreadWithoutReturn(o.ToString());//要多线程执行的任务
            //    Action callback = () => Console.WriteLine("回调 btnAsync_Click_{0}",b);//回调执行的任务
            //    ThreadStart methodAll = new ThreadStart(() =>
            //    {
            //        method.Invoke(string.Format("btnAsync_Click_{0}", b));
            //        callback.Invoke();
            //    });
            //    Thread thread = new Thread(methodAll);
            //    thread.Start();
            //    threadList.Add(thread);
            //}

            foreach (var item in threadList )
            {
                item.Join();   //主线程等待
            }
            watch.Stop();
            Console.WriteLine("********************btnThread_Click End 主线程id={0} {1}********************", Thread.CurrentThread.ManagedThreadId, watch.ElapsedMilliseconds);
            Console.WriteLine();
        }

        private void TestThreadWithoutReturn(string name)
        {
            Console.WriteLine("TestThread Start Name={2},当前线程的id:{0},当前时间为{1}", Thread.CurrentThread.ManagedThreadId, DateTime.Now.ToString("hh:mm:ss:fff"), name);
            long Sum = 0;
            for (int i = 1; i < 999999999; i++)
            {
                Sum += i;
            }
            //Thread.Sleep(2000);
            Console.WriteLine("TestThread End Name={2},当前线程的id:{0},当前时间为{1}", Thread.CurrentThread.ManagedThreadId, DateTime.Now.ToString("hh:mm:ss:fff"), name);
        }