测量代码执行时间 [英] Measuring code execution time

问题描述

为了测试目的，我想知道完成一个过程/函数/命令需要多长时间.

这就是我所做的，但我的方法是错误的，因为如果秒差为 0，则无法返回经过的毫秒数:

注意 sleep 值为 500 ms，所以经过的秒数为 0，则它不能返回毫秒.

 Dim Execution_Start As System.DateTime = System.DateTime.NowThreading.Thread.Sleep(500)Dim Execution_End As System.DateTime = System.DateTime.NowMsgBox(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))

有人可以告诉我更好的方法吗?也许使用 TimeSpan?

解决办法:

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 &_女士:"&Execution_Start.Elapsed.Milliseconds &vbNewLine, _"代码执行时间", MessageBoxButtons.OK, MessageBoxIcon.Information)

解决方案

更好的方法是使用 Stopwatch，而不是 DateTime 差异.

秒表类 - Microsoft Docs<块引用>

提供一组方法和属性，您可以使用它们准确测量经过的时间.

//创建并启动一个秒表实例秒表 秒表 = Stopwatch.StartNew();//替换为您的示例代码:System.Threading.Thread.Sleep(500);秒表.停止()；Console.WriteLine(秒表.ElapsedMilliseconds);

I want to know how much time a procedure/function/order takes to finish, for testing purposes.

This is what I did but my method is wrong 'cause if the difference of seconds is 0 can't return the elapsed milliseconds:

Notice the sleep value is 500 ms so elapsed seconds is 0 then it can't return milliseconds.

    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))

Can someone show me a better way to do this? Maybe with a TimeSpan?

The solution:

Dim Execution_Start As New Stopwatch
Execution_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)

解决方案

A better way would be to use Stopwatch, instead of DateTime differences.

Stopwatch Class - Microsoft Docs

Provides a set of methods and properties that you can use to accurately measure elapsed time.

// create and start a Stopwatch instance
Stopwatch stopwatch = Stopwatch.StartNew(); 

// replace with your sample code:
System.Threading.Thread.Sleep(500);

stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedMilliseconds);

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