测量代码执行时间

Question

我想知道一个过程/功能/命令需要花费多少时间来进行测试。这是我所做的，但是我的方法是错误的，因为如果秒的差为0，则无法返回经过的毫秒数：请注意，睡眠值是500毫秒，所以经过的秒数是0，那么它就不能返回毫秒。    Dim Execution_Start As System.DateTime = System.DateTime.Now    Threading.Thread.Sleep(500)    Dim Execution_End As System.DateTime = System.DateTime.Now    MsgBox(String.Format("H:{0} M:{1} S:{2} MS:{3}", _    DateDiff(DateInterval.Hour, Execution_Start, Execution_End), _    DateDiff(DateInterval.Minute, Execution_Start, Execution_End), _    DateDiff(DateInterval.Second, Execution_Start, Execution_End), _    DateDiff(DateInterval.Second, Execution_Start, Execution_End) * 60))有人可以告诉我一种更好的方法吗？也许与TimeSpan？解决方案：Dim Execution_Start As New StopwatchExecution_Start.Start()Threading.Thread.Sleep(500)MessageBox.Show("H:" & Execution_Start.Elapsed.Hours & vbNewLine & _       "M:" & Execution_Start.Elapsed.Minutes & vbNewLine & _       "S:" & Execution_Start.Elapsed.Seconds & vbNewLine & _       "MS:" & Execution_Start.Elapsed.Milliseconds & vbNewLine, _       "Code execution time", MessageBoxButtons.OK, MessageBoxIcon.Information)

Answer 1

更好的方法是使用Stopwatch而不是DateTime差异。

秒表类-Microsoft Docs

提供一组方法和属性，可用于准确测量经过的时间。

Stopwatch stopwatch = Stopwatch.StartNew(); //creates and start the instance of Stopwatch

//your sample code

System.Threading.Thread.Sleep(500);

stopwatch.Stop();

Console.WriteLine(stopwatch.ElapsedMilliseconds);

Answer 2

Stopwatch 测量经过的时间。

// Create new stopwatch

Stopwatch stopwatch = new Stopwatch();

// Begin timing

stopwatch.Start();

Threading.Thread.Sleep(500)

// Stop timing

stopwatch.Stop();

Console.WriteLine("Time elapsed: {0}", stopwatch.Elapsed);

这是一个DEMO。