C# Stopwatch 使用

  static IEnumerable<int> SampleData()
     {
       const int arraySize = ;
       var r = new Random();
       return Enumerable.Range(, arraySize).Select(x => r.Next()).ToList();
     }

     static void IntroParallel()
     {
       var data = SampleData();

       var watch = new Stopwatch();

       watch.Start();
       var q1 = (from x in data
                 where Math.Log(x) <
                 select x).Average();
       watch.Stop();
       Console.WriteLine("sync {0}, result: {1}", watch.ElapsedMilliseconds, q1);

       watch.Reset();
       watch.Start();
       var q2 = (from x in Partitioner.Create(data).AsParallel()
                 where Math.Log(x) <
                 select x).Average();
       watch.Stop();
       Console.WriteLine("async {0}, result: {1}", watch.ElapsedMilliseconds, q2);
     }