iOS Issue downloading portal item

Question

I've upgraded my Xamarin Forms app from the beta version to the latest release and everything is working well except for downloading portal items on iOS.  The code below is what I am using to accomplish this download.  It works like a charm on Android, but on iOS the GetDataAsync call returns an empty stream.  The item I am trying to download is a zip file that we uploaded to the portal as a Code Sample if that matters.

Not sure if this is an iOS bug or if there is some obscure iOS setting I need to toggle, but any help here would be greatly appreciated.  Thanks ...

var item = await PortalItem.CreateAsync(PortalUser.Portal, itemId);

var outFile = File.OpenWrite(fileName);
 var stream = await item.GetDataAsync();
 var reader = new BinaryReader(stream);

using (var writer = new BinaryWriter(outFile))
 {
    writer.Write(reader.ReadBytes((int)stream.Length));
    writer.Flush();
    reader.Close();
 }

AndyWright · Answer

Ok, thanks again for your help …

RichZwaap · Answer

It will require a bit more looking into to confirm, but I'm inclined to think that this is not a bug.  Rather, the stream returned is just what gets passed back on iOS by the underlying HTTP calls employed by the API.  The fact that it changed from beta to final is likely because of the switch from the managed (Mono) to native (iOS) networking stack.  Nonetheless, initial indications are that this is simply a by-product of how the platform works, much as length is likewise unavailable on the stream returned by the GetDataAsync call on UWP.  The fact that length is not available is not a bug there, either, but rather platform-specific behavior.

-Rich

AndyWright · Answer

Hi Rich,

Thanks for the tip.  The CopyTo was actually hanging my app, but I switched to CopyToAsync and it seems to be working like a charm.  You got me out of a pickle there.  That almost makes up for not having related tables in the API.

So will this be logged as an API bug and fixed for an upcoming release?

Andy