C# 的计时类 Stopwatch

C# 里增加了一个专门用来计时的类，叫 Stopwatch。这样可以简化一些编程，见下例：

class StopWatchTest : IEntryPoint
    {
        public void EntryPoint()
        {
            Stopwatch stopwatch = new Stopwatch();
            stopwatch.Start();
            System.Threading.Thread.Sleep(1000);
            stopwatch.Stop();
            long elapsedTimeInMilliSeconds = stopwatch.ElapsedMilliseconds;
            Console.Out.WriteLine("elapsedTimeInMilliSeconds = {0}", elapsedTimeInMilliSeconds);
        }
    }

这个类在 System.Diagnostics 命名空间中。