Is `Stopwatch` a More Accurate Alternative to `DateTime.Now` for Performance Measurement?

Precision performance measurement:

better Stopwatch DateTime.Now When searching for performance bottlenecks and accurate timing, it is important to choose the right tool. Although the "的> code fragment looks simple enough, it is not the best solution.

DateTime.Now : More accurate choices

In order to obtain accurate performance measurement results, it is recommended to use the Stopwatch class in the name space. This type uses a high -precision timer to ensure a more accurate result than .

The following code demonstrates the usage of System.Diagnostics: Stopwatch DateTime.Now

will dynamically check the availability of high -precision timers and use

when necessary. In addition, its resolution is 15 milliseconds, and its accuracy is better than Stopwatch.

Stopwatch sw = Stopwatch.StartNew();
PerformWork();
sw.Stop();
Console.WriteLine("Time taken: {0}ms", sw.Elapsed.TotalMilliseconds);

Accuracy considerations

Stopwatch DateTime.UtcNow Please note that is usually more efficient than DateTime.Now, because it avoids the time zone and summer time calculation. In addition, if your hardware does not have a high -frequency counter,

will automatically switch to

to ensure accuracy. You can confirm whether the hardware timer can be used by checking the attribute.

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