C# 計算程序的運行時間

//用Stopwatch類(System.Diagnostics)計算耗時
static void SubTest() 
{ 
Stopwatch sw = new Stopwatch(); 
sw.Start();

//耗時巨大的代碼

sw.Stop(); 
TimeSpan ts2 = sw.Elapsed; 
Console.WriteLine("Stopwatch總共花費{0}ms.", ts2.TotalMilliseconds); 
}