c#前台线程和后台线程

前台线程：在主线程运行结束后，若前台线程没有运行完则会阻止主线程的关闭
后台线程：在主线程运行结束后，整个线程会结束

 class ThreadSample
        {
            private readonly int _iterations;
            public ThreadSample(int iterations)
            {
                _iterations = iterations;
            }
            public void CountNumbers()
            {
                for(int i = 0; i < _iterations; i++)
                {
                    Thread.Sleep(TimeSpan.FromSeconds(0.5));
                    Console.WriteLine("{0} prints {1}",
                        Thread.CurrentThread.Name, i);
                }
            }
        }
        static void Main(string[] args)
        {
            var sampleForeground = new ThreadSample(10);
            var sampleBackground = new ThreadSample(20);
            var threadOne = new Thread(sampleForeground.CountNumbers);
            threadOne.Name = "ForgroundThread";
            var threadTwo = new Thread(sampleBackground.CountNumbers);
            threadTwo.Name = "BackgroundThread";
            threadTwo.IsBackground = true;
            threadOne.Start();
            threadTwo.Start();
        }

这里threadTwo为后台线程则treadOne运行结束后则整个线程退出，若不设置为前台线程则会一直运行到threadOne和threadTwo都结束。