C# Thread IsBackground 先後臺線程

Thread 區別先後臺線程屬性IsBackground

一、  建立一個線程默認是前臺線程，即IsBackground=true

二、  主線程的結束會關聯前臺線程，前臺線程會阻止主進程的結束，需等待前臺線程完成。

三、  主進程結束時後臺線程也會結束，即便沒有執行完成也會被中斷。

        static void Main(string[] args)
        {
            BackgroundTest shortTest = new BackgroundTest(50);
            Thread foregroundThread =
                new Thread(new ThreadStart(shortTest.RunLoop));
            foregroundThread.Name = "ForegroundThread";

            BackgroundTest longTest = new BackgroundTest(100);
            Thread backgroundThread =
                new Thread(new ThreadStart(longTest.RunLoop));
            backgroundThread.Name = "BackgroundThread";
            backgroundThread.IsBackground = true;

            foregroundThread.Start();
            backgroundThread.Start();

           Task.Factory.StartNew(() =>
            {
                Thread.CurrentThread.Name = "Task Thread";
                Thread.CurrentThread.IsBackground = false; //設置爲前臺線程
                new BackgroundTest(50).RunLoop();
            });

//回車結束主線程，若是有前臺線程在運行是沒法結束的，（後臺線程就會被終止，不會執行完成）
            Console.ReadLine();
        }

        class BackgroundTest
        {
            int maxIterations;

            public BackgroundTest(int maxIterations)
            {
                this.maxIterations = maxIterations;
            }

            public void RunLoop()
            {
                String threadName = Thread.CurrentThread.Name;

                for (int i = 0; i < maxIterations; i++)
                {
                    Console.WriteLine("{0} count: {1}",
                        threadName, i.ToString());
                    Thread.Sleep(250);
                }
                Console.WriteLine("{0} finished counting.", threadName);
            }
        }