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Let's say I have Stopwatch running in my code and in the middle, some other application has changed the system clock (I have Domain Time on my server syncing every second).
Will it affect the stopwatch result?
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The Stopwatch isn't doing anything between the calls to Start and Stop ... It just stores the current timestamp (via QueryPerformanceCounter ) when you start it, and compare it to the current timestamp when you stop it. So there is no reason it could affect the performance of your code, at least not significantly.
Timing with a stopwatch has quite a large uncertainty (accuracy error) due to the problem of actually having to press the button at the right time to start and stop it. Human reaction time can be as much as 2or 3 tenths of a second.
It depends.
Stopwatch relies on Win32 QueryPerformanceCounter() only if it is available. This implementation is timechange tolerant.
In case high-resolution counters are not available, Stopwatch falls back to system timer, basically DateTime.UtcNow.Ticks call. In this unfortunate case Stopwatch results will be affected by time(not timezone) changes.
As it is written in cited MSDN article, you can check if high-resolution counters are available using IsHighResolution field.
You can blame .Net team using this won't fix defect :)
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No, internally Stopwatch relies on Win32 QueryPerformanceCounter() which is not tied to the system clock.
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