Hi, This bug was actually fixed about a month ago, which is why things didn't quite add up for me, sorry about the confusion.
https://bugzilla.xamarin.com/show_bug.cgi?id=2483 You can work around this for now by spinning up your own thread: Thread t = new Thread ((v) => { try { client.DownloadData (new System.Uri (file)); } catch (Exception) { // ignore exceptions if cancelled } }); t.Start (); // when the user cancels the download t.Interrupt (); Best regards, Rolf On Tue, Apr 17, 2012 at 9:09 AM, victoria <[email protected]> wrote: > That is odd, I can't really make it more of a test case because that's all > there is. If I start a clean solution and a console project with just > > class MainClass > { > public static void Main (string[] args) > { > string file = > " > http://www.kernel.org/pub/linux/kernel/v2.0/linux-2.0.1.tar.bz2";; > > System.Net.WebClient client = new > System.Net.WebClient(); > client.DownloadDataAsync(new System.Uri(file)); > client.CancelAsync(); // still kabooms > } > } > > I get the same crash. Are we using the same version? I'm on 2.10.9 (Stable) > and I'm not really in a position where I'd feel comfortable switching to > the > beta branch... but if it works on beta and not stable then I guess I can > just wait for it to be fixed, the project I'm working on isn't due for > release for quite a while :-) > > > Rolf Bjarne Kvinge wrote > > > > Hi, > > > > On Mon, Apr 16, 2012 at 10:45 AM, victoria <iminurbase@> wrote: > > > >> Hello list, > > > > > >> I'm not sure if this is a Monotouch bug or if we're doing something > wrong > >> here. We're trying to use System.Net.WebClient to fetch some data async > >> with > >> a nice optional "Cancel this download" button for the user - however > >> trying > >> to cancel the request blows up everything. Behold: > >> > >> // random somewhat big file to not download > >> string file = > >> "http://www.kernel.org/pub/linux/kernel/v2.0/linux-2.0.1.tar.bz2";; > >> > >> WebClient client = new WebClient(); > >> client.DownloadDataAsync(new Uri(file)); > >> client.CancelAsync(); // kaboom > >> > > > > I just tried this exact code, and it works fine for me. > > > > I've looked at both the exception and our WebClient implementation, and > > the > > exception doesn't make much sense - so something is obviously going > wrong. > > I suggest you file a bug with a complete test case, and I'll have a look > > at > > it asap. > > > > Rolf > > > > > >> > >> The code above works just fine on .NET/Windows - also, changing > >> DownloadDataAsync to DownloadStringAsync seems to work as we would > expect > >> it > >> to (no kaboom, but we need the raw data so unfortunately we can't use > it) > >> > >> Thoughts? Bug? Help? > >> > >> / V > >> > >> -- > >> View this message in context: > >> > http://monotouch.2284126.n4.nabble.com/CancelAsync-on-DownloadDataAsync-crashes-monotouch-tp4560900p4560900.html > >> Sent from the MonoTouch mailing list archive at Nabble.com. > >> _______________________________________________ > >> MonoTouch mailing list > >> [email protected] > >> http://lists.ximian.com/mailman/listinfo/monotouch > >> > > > > _______________________________________________ > > MonoTouch mailing list > > [email protected] > > http://lists.ximian.com/mailman/listinfo/monotouch > > > > > -- > View this message in context: > http://monotouch.2284126.n4.nabble.com/CancelAsync-on-DownloadDataAsync-crashes-monotouch-tp4560900p4563814.html > Sent from the MonoTouch mailing list archive at Nabble.com. > _______________________________________________ > MonoTouch mailing list > [email protected] > http://lists.ximian.com/mailman/listinfo/monotouch >
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