C#计算一段程序运行时间的三种方法

第一种方法利用System.DateTime.Now:

  static void SubTest()
 {
  DateTime beforDT = System.DateTime.Now;
  //耗时巨大的代码
  DateTime afterDT = System.DateTime.Now;
  TimeSpan ts = afterDT.Subtract(beforDT);
  Console.WriteLine("DateTime总共花费{0}ms.", ts.TotalMilliseconds);
  }
       第二种用Stopwatch类(System.Diagnostics):
   static void SubTest()
  {
  Stopwatch sw = new Stopwatch();
  sw.Start();
   //耗时巨大的代码
  sw.Stop();
  TimeSpan ts2 = sw.Elapsed;
  Console.WriteLine("Stopwatch总共花费{0}ms.", ts2.TotalMilliseconds);
  }
        第三种用API实现:
  [System.Runtime.InteropServices.DllImport("Kernel32.dll")]
  static extern bool QueryPerformanceCounter(ref long count);
  [System.Runtime.InteropServices.DllImport("Kernel32.dll")]
  static extern bool QueryPerformanceFrequency(ref long count);
  static void SubTest()
  {
  long count = 0;
  long count1 = 0;
  long freq = 0;
  double result = 0;
  QueryPerformanceFrequency(ref freq);
  QueryPerformanceCounter(ref count);
  //耗时巨大的代码
  QueryPerformanceCounter(ref count1);
  count = count1 - count;
  result = (double)(count) / (double)freq;
  Console.WriteLine("QueryPerformanceCounter耗时: {0} 秒", result);
  }
       也可以使用委托对其进行封装,方便调用:
     /// <summary>
   /// 计算时间
   /// </summary>
   /// <param name="function">要被执行的代码</param>
   /// <returns>执行这一段代码耗时,单位:毫秒</returns>
   public static string Stopwatch(Action function)
   {
       System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
       sw.Start();
       //开始执行业务代码
       function();
       sw.Stop();
       TimeSpan timeSpan = sw.Elapsed;
       return (timeSpan.TotalMilliseconds) + "ms";
   }
THE END
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