C#中计时器的操作

static void Main(string[] args)
{
    Stopwatch sw = new Stopwatch();
    long num = 0;
    sw.Reset();
    sw = Stopwatch.StartNew();
    for (int i = 1; i <100000000; i++) num += 1;
    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();
}