c# - DispatcherTimer with interval 0,0,1 is not exactly 1 second? -

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(using wpf)

in small application wrote, using count-down timers. have used dispatchertimer.

counter01 = new dispatchertimer(); counter01.tick += new eventhandler(counter01_tick); counter01.interval = new timespan(0, 0, 1);

but when test/use program, have noticed when it's set (for example) 60 minutes count-down, gets few minutes off compared real world time.

could reason dispatchertimer not 1 second if use did above?

timers never absolutely exact. after all, it's got run on dispatcher thread - expect happen if dispatcher busy processing other thread @ same time?

it's close enough visibly ticking @ once per second - should take current time , subtract "target" time (or use stopwatch) fairly-accurate count-down instead of counting number of times timer has ticked.


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