c# 中CountDownEvent的使用

c# 中CountDownEvent的使用

class Program    {        static CountdownEvent _count = new CountdownEvent(3);        static void Main(string[] args)        {                      Task.Factory.StartNew(() =>            {                Thread.Sleep(2000);                Console.WriteLine("thread 1 complete");                _count.Signal();            });            Task.Factory.StartNew(() =>            {                Thread.Sleep(5000);                Console.WriteLine("thread 2 complete");                _count.Signal();            });            Task.Factory.StartNew(() =>            {                Thread.Sleep(3000);                Console.WriteLine("thread 3 complete");                _count.Signal();            });            Console.WriteLine("waiting tasks....");            _count.Wait();            Console.WriteLine("all task completed");            Console.ReadKey();        }          }使用TASK的waitAll可以達到同樣的效果： var t1 = Task.Factory.StartNew(() =>            {                Thread.Sleep(2000);                Console.WriteLine("thread 1 complete");                        });           var t2 = Task.Factory.StartNew(() =>            {                Thread.Sleep(5000);                Console.WriteLine("thread 2 complete");                        });           var t3 = Task.Factory.StartNew(() =>            {                Thread.Sleep(3000);                Console.WriteLine("thread 3 complete");                         });            Console.WriteLine("waiting tasks....");            Task.WaitAll(t1, t2, t3);            Console.WriteLine("all task completed");            Console.ReadKey();

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