//開始執行時間
TimeSpan startTime = new TimeSpan(System.DateTime.Now.Ticks);
A......................代碼塊
B........................................代碼塊
TimeSpan endTime = new TimeSpan(System.DateTime.Now.Ticks);
TimeSpan countTime = startTime.Subtract(endTime).Duration();
//得到A,B代碼塊執行的時間(毫秒)
Console.log(countTime.TotalMilliseconds.ToString());