c# - Cancelling background worker tasks -

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• cancel backgroundworker 2 answers
• cancelling background tasks 5 answers
• how cancel working backgroundworker? 1 answer

i have background worker performs time consuming task, i'm having trouble cancelling issue because can manage flag cancellation , not terminate process. in order solve it, tried put check points in heavy function want exit , seems not quite efficient. code looks :

in points in heavy function put 2 lines :

if (general.backgroundworker1.cancellationpending) {     return; }  private void button4_click(object sender, eventargs e) //button invokes heavy function {     if (!backgroundworker1.isbusy)         backgroundworker1.runworkerasync(); }  private void backgroundworker1_dowork(object sender, doworkeventargs e) {     heavyfunction(this);     if (backgroundworker1.cancellationpending)     {         e.cancel = true;         return;     } }  private void backgroundworker1_runworkercompleted_1(object sender, runworkercompletedeventargs e) {     if (e.cancelled)     {         statuslabel.text = "status: cancelled";     }     else if (e.error != null)     {         statuslabel.text = "error!";     }     else     {         code;     } }  private void cancelsdoutloop_click(object sender, eventargs e) {     if (backgroundworker1.isbusy)     {         backgroundworker1.cancelasync();     } } 

cancel can complicate function implement , left afterthought.

if want cancel heavyfunction (which should longrunningfunction ;) have become cancel aware. said put check points, makes sense.

you can try use more of cancellable method calls accept cancellation token. example task.delay has 2 overloads:

delay(timespan) 

and

delay(timespan, cancellationtoken) 

another strategy split method smaller, shorter tasks.

finally, cancel operation doesn't have instantaneous. may end "cancelling..." status waits moment stop job.