性能分析 之 統計代碼的執行時間

一、System.Diagnostics 命名空間下的 Stopwatch 類

//實例化一個計時器
Stopwatch watch = new Stopwatch();
//開始計時
watch.Start();

//此處為要計算的運行代碼
for (int i = 1; i < 1000000; i++) { }   // Execute the task to be timed

//結束計時
watch.Stop();

//獲取當前實例測量得出的總運行時間（以毫秒為單位）
string time = watch.ElapsedMilliseconds.ToString();
//說明：Stopwatch提供了幾個方法用以控制Stopwatch對象。Start方法開始一個計時操作，Stop方法停止計時。為避免這種情況，在第二次計時前用Reset方法將對象歸零
 
Console.WriteLine("Elapsed: {0}",watch.Elapsed);
Console.WriteLine("In milliseconds: {0}",watch.ElapsedMilliseconds);
Console.WriteLine("In timer ticks: {0}",watch.ElapsedTicks);

二、DateTime 類

DateTime startTime = DateTime.Now;
Console.WriteLine ("Started: {0}", startTime);
 
// Execute the task to be timed
for (int i=1; i < 100000; i++){}  

DateTime stopTime = DateTime.Now;
Console.WriteLine ("Stopped: {0}", stopTime);

TimeSpan elapsedTime = stopTime - startTime;
Console.WriteLine ("Elapsed: {0}", elapsedTime);
Console.WriteLine ("in hours       :" + elapsedTime.TotalHours);
Console.WriteLine ("in minutes     :" + elapsedTime.TotalMinutes);
Console.WriteLine ("in seconds     :" + elapsedTime.TotalSeconds);
Console.WriteLine ("in milliseconds:" + elapsedTime.TotalMilliseconds);