public static void Show()
{
var sampleForeground = new ThreadSample(10);
var sampleBackground = new ThreadSample(20);
var threadOne = new Thread(sampleForeground.CountNumbers);
threadOne.Name = "ForegroundThread";
var threadTwo = new Thread(sampleBackground.CountNumbers);
threadTwo.Name = "BackgroundThread";
threadTwo.IsBackground = true;
threadOne.Start();
threadTwo.Start();
Console.ReadLine(); //只剩下后台程序则直接结束工作；可以不用等待完全输出，输入按键退出控制台
}
static void RunThreads()
{
var sample = new ThreadSample();
var threadOne = new Thread(sample.CountNumbers);
threadOne.Name = "ThreadOne";
var threadTwo = new Thread(sample.CountNumbers);
threadTwo.Name = "ThreadTwo";
threadOne.Priority = System.Threading.ThreadPriority.Highest;
threadTwo.Priority = System.Threading.ThreadPriority.Lowest;
threadOne.Start();
threadTwo.Start();
Thread.Sleep(TimeSpan.FromSeconds(2));
sample.Stop();
}