c# - Can cancellation token be used at tasks method within? -

i've started working tasks , i've come things don't quite understand calling methods within task. have started new task this:

var ts = new cancellationtokensource(); var token = ts.token;  task.run(() => control(), token);   void control()  {      while(!token.iscancellationrequested)       {           token.throwifcancellationrequested();            switch(enum)            {                 case something:                   startsomething();                break;            }             task.delay(50, token).wait();      }  } 

now don't understand behavior of startsomething() once token has been cancelled. if startsomething() contains while loop, can use?

!token.iscancellationrequested 

and

token.throwifcancellationrequested(); 

as well, if cancellation exception being thrown inside startsomething() loop, instantly cancel task?

yes, can pass same token onto startsomething , exceptions bubble control , cancel task. if don't keep running if cancellationtokenwas cancelled until returns control tocontrol` observes token:

void startsomething(cancellationtoken token) {     while (true)     {         token.throwifcancellationrequested(); // cancel task.         // ...     } } 

keep in mind though token.throwifcancellationrequested() raise exception , task canceled while !token.iscancellationrequested complete task without marking canceled.