static void Main(string[] args)

{

    Stopwatch sw = new Stopwatch();

    long num = ;

    sw.Reset();

    sw = Stopwatch.StartNew();

    for (int i = ; i < ; i++) num += ;

    sw.Stop();

    TimeSpan el = sw.Elapsed;

    Console.WriteLine("花费 {0} ", el);

    long ms = sw.ElapsedMilliseconds;

    Console.WriteLine("花费 {0} 毫秒", ms);

    long tk = sw.ElapsedTicks;

    Console.WriteLine("花费 {0} ticks", tk);

    Console.ReadKey();

}