c# - Asynchronous Thread Lifetime & WPF UI Update -

on button click have fired call startcontinuousthread keeps polling server every 1 second.

public class threadswindow {     cancellationtokensource wtoken = new cancellationtokensource();     private void btnstarttest_click(object sender, routedeventargs e)     {         startcontinuousthread();     }       void startcontinuousthread()     {         while(true)         {             var fact = task.factory.startnew(() =>             {                 callserver();                 task.delay(1000, wtoken.token);             },             wtoken.token);         }      } } 

startcontinuousthread starts executing, btnstarttest_click event handler finishes execution.

how startcontinuousthread method able update ui in case?

i wonder whether startcontinuousthread terminated event handler, since there no wait keyword re-joining.

please help!

if goal poll server every second have number of problem.

1. there no loop. execute method once , stop.

2. you create task using delay , ignore it. ought creating continuation of task rest of work not second.

here implementation addresses issues:

private async task startcontinuousthread(cancellationtoken token) {     while (true)     {         token.throwifcancellationrequested();         await task.run(() => callserver());         await task.delay(1000, token);     } } 

another possibility, if you're using older version of c#, use timer run code every second.

as updating ui; can freely anywhere outside of call task.run in example. in example you'd need use mechanism marshal ui thread, such capturing ui's synchronization context , posting it.