Part 92 Significance of Thread Join and Thread IsAlive functions-优快云博客

本文详细解析了C#中Thread.Join与Thread.IsAlive的使用方法。Thread.Join使主线程等待被调用线程完成，可指定超时时间；Thread.IsAlive判断线程是否正在执行。通过示例代码展示了如何结合这两个方法进行线程管理。

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Thread.Join & Thread.IsAlive functions

Join blocks the current thread and makes it wait until the thread on which Join method is invoked completes.Join method also has a overload where we can specify the timeout. If we don't specify the timeout the calling thread waits indefinitely(无限期地), until the thread on which Join() is invoked completes. This overloaded Join(int millisecondesTimeout) method returns boolean. True if the thread has terminated(终止) otherwise false.

Join is particularly(特别地) useful when we need to wait and collect result from a thread execution or if we need to do some clean-up after the thread has completed.

IsAlive returns boolean. True if the thread is still executing otherwise false.

public static void Main(string[] args)
        {
            Console.WriteLine("main start");
            Thread t1 = new Thread(ThreadFunction1);
            t1.Start();
            Thread t2 = new Thread(ThreadFunction2);
            t2.Start();
            if(t1.Join(1000))
            {
                Console.WriteLine("threadfunction1 end");
            }
            else
            {
                Console.WriteLine("threadfunction1 still working");
            }
            if(t1.IsAlive)
            {
                for (int i = 1; i < 10; i++)
                {
                    Console.WriteLine("threadfunction1 still working...");
                    Thread.Sleep(500);                    
                }
            }
            Console.WriteLine("main end");
        }

        public static void ThreadFunction1()
        {
            Console.WriteLine("threadfunction1 start");
            Thread.Sleep(5000);
            Console.WriteLine("threadfunction1 end");
        }

        public static void ThreadFunction2()
        {
            Console.WriteLine("threadfunction2 start");
        }