C# 监测指定进程的CPU占用率

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/// <summary>      /// 监测性能      /// </summary>      /// <returns></returns>      private bool MonitorPerformance()      {          bool res = false;          int times = 1;          int interval = 1000;//Sleep的时间间隔          TimeSpan prevCpuTime = TimeSpan.Zero; //上次记录CPU的时间          try          {              while (true)              {                  Process[] pros = Process.GetProcessesByName(ProcessName);                  if (pros.Length > 0)                  {                      foreach (Process item in pros)                      {                          PerformanceCounter curpc = new PerformanceCounter("Process", "Working Set", item.ProcessName);                          //当前时间                          TimeSpan curCpuTime = item.TotalProcessorTime;                          //计算                          double value = (curCpuTime - prevCpuTime).TotalMilliseconds / interval / Environment.ProcessorCount * 100;                          prevCpuTime = curCpuTime;                          //这个工作集是动态更新的                          Console.WriteLine("{0}:{1}  {2:N}KB CPU使用率：{3}", item.ProcessName, "工作集", curpc.NextValue() / 1024, value);                          if (value < 5)                          {                              res = true;                              item.Kill();                          }                          Thread.Sleep(interval);                      }                  }                  else                  {                      break;                  }                  if (times * interval == 900000)//十五分钟后超时                  {                      foreach (Process item in pros)                      {                          KillProcessAndChildren(item.Id);                      }                      break;                  }                  times++;              }          }          catch (Exception ex)          {              Console.WriteLine("Function: MonitorPerformance " + ex.Message);          }          return res;      }