windows phone 7 - How to disable BackgroundTransferRequest's TransferStatusChanged event handler after I unsubscribed it? -


i'm using background transfer download videos , subscribed each request's transferstatuschanged , transferprogresschanged event monitor it's status , download progress. when cancelled 1 background transfer request using backgroundtransferservice.remove() method, fired transferstatuschanged event as msdn mentioned. don't want execute event handlers, try unsubscribe event before removed request, code below:

backgroundtransferrequest transfertoremove = backgroundtransferservice.find(requestid); if (transfertoremove != null) {     transfertoremove.transferstatuschanged -= transfer_transferstatuschanged;     transfertoremove.transferprogresschanged -= transfer_transferprogresschanged;     backgroundtransferservice.remove(transfertoremove); }

but transferstatuschanged event handler still fired. can me?

backgroundtransferservice.remove(transfertoremove); accepts request. take sometime remove it. meanwhile, again call add() function , got 1 more event i.e. transfer_transferprogresschanged.

in event transfer_transferprogresschanged, first check backgroundtransferservice contains request or not.

if(backgroundtransferservice.requests.contains(m_currentrequest)) {   backgroundtransferservice.remove(m_currentrequest);   unsubscribeyourevents();   dootherstuffrealtedtodownload(); }

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