Task WhenAny() WhenAll()区别

Task.WhenAny()
Task.WhenAll()
这两个与waitALL，waitAny是有区别的
when是异步的，wait是同步的


例子
Task[] ts = new Task[] {new Task(()=> { Thread.Sleep(3000); Console.WriteLine("触发1"); }),
               new Task(() => { Thread.Sleep(9000); Console.WriteLine("触发2"); }) };
            Task.WhenAny(ts).ContinueWith((task) => { Console.WriteLine("OK"+task.Result); });
            ts[0].Start();
            ts[1].Start();
            Console.WriteLine("主程序");
            Console.ReadKey();
或者
Task[] ts = new Task[] {Task.Factory.StartNew(()=> { Thread.Sleep(3000); Console.WriteLine("触发1"); }),
                Task.Factory.StartNew(() => { Thread.Sleep(9000); Console.WriteLine("触发2"); }) };
            Task.WhenAny(ts).ContinueWith((task) => { Console.WriteLine("OK"+task.Result); });
            Console.WriteLine("主程序");

主程序会很快走完，下面就会走异步的任务




下面是连续执行后续任务的例子
 static void DoOnFirst()
            {
                Console.WriteLine("doing some task test");
                Thread.Sleep(3000);
          }
        static void DoOnSecond(Task t)
            {
                Console.WriteLine("task {0} finished",t.Id);
               Console.WriteLine("this task id {0}", Task.CurrentId);
              Console.WriteLine("do some cleanup");
               Thread.Sleep(3000);
          }
    static void Main(string[] args)
        {
            //callMethod();
            Task t1 = new Task(DoOnFirst);
            t1.Start();
            Task t2 = t1.ContinueWith(DoOnSecond);
            Task t3 = t2.ContinueWith(DoOnSecond);
            Task t4 = t3.ContinueWith(DoOnSecond);
            Console.ReadKey();
        }


Task 返回值，需要泛型Task

static string DoOnFirst()
            {
                Console.WriteLine("doing some task test");
                Thread.Sleep(3000);
            return "DoOnFirst";
          }
        static void DoOnSecond(Task t)
            {
                Console.WriteLine("task {0} finished",t.Result);
               Console.WriteLine("this task id {0}", Task.CurrentId);
              Console.WriteLine("do some cleanup");
               Thread.Sleep(3000);
          }
    static void Main(string[] args)
        {
            //callMethod();
            Task t1 = new Task(DoOnFirst);
            t1.Start();
            Task t2 = t1.ContinueWith(DoOnSecond);
            //Task t3 = t2.ContinueWith(DoOnSecond);
            //Task t4 = t3.ContinueWith(DoOnSecond);
            Console.ReadKey();
        }


单独阻塞一个Task（当前线程阻塞）

Task t1 = new Task(DoOnFirst);
            t1.Start();
            t1.GetAwaiter().GetResult();