FW4与FW 3.5中DateTime.TryParseExact的性能问题 [英] Performance Issue with DateTime.TryParseExact in FW4 vs FW 3.5

问题描述

大家好

我遇到了fw3.5和4之间的一个有趣的性能问题

I come across an interesting performance issue between fw3.5 and 4

当我在fw 4上运行此代码时，运行时间为8.39秒，但是在fw3.5上运行时，时间为0.34秒

when i run this code on fw 4 the running time is 8.39 sec but when running it on fw3.5 the time is 0.34 sec

Stopwatch stopWatch = new Stopwatch();
      string formats = "%M/%d/yyyy %h:mm:%s:fff tt";
      DateTime datetime = DateTime.Now;
      stopWatch.Start();

      for (int i = 0; i < 10000; i++)
      {
        DateTime dateTime;
        bool isParsed = DateTime.TryParseExact(
          DateTime.Now.ToString(),
          formats,
          new CultureInfo("en-US"),
          DateTimeStyles.None,
          out dateTime);
      }
      stopWatch.Stop();

      TimeSpan ts = stopWatch.Elapsed;
      string elapsedTime = String.Format("{0:00}:{1:00}.{2:00}", ts.Minutes, ts.Seconds, ts.Milliseconds / 10);
      Console.WriteLine("RunTime " + elapsedTime);

推荐答案

感兴趣...我检查了它. CultureInfo的实现方式有所不同:

Interessting... I checked it. CultureInfo is differently implemented:

1.)它在4.0中具有属性:

1.) It has a attribute in 4.0:

[SecuritySafeCritical, TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]








Whatever that means..

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