Question

I have code which takes in data from Flickrs Rest service and populates a ListView. This code works fine and when I run my app I can search for photos and be displayed a list of them. However I want to then get a single photos data but when I try to access this data from the ListView it’s completely empty (Iv debugged it and it just contains null entries). I don’t have a lot of experience with C# so could anyway advise me as to why I would be getting null results?

        private async void ParseFlickrResponse(HttpResponseMessage response)
    {

        XDocument xml = XDocument.Parse(await response.Content.ReadAsStringAsync());          
        var photos = from results in xml.Descendants("photo")
                     select new FlickrImage
                     {
                         ImageId = results.Attribute("id").Value.ToString(),
                         FarmId = results.Attribute("farm").Value.ToString(),
                         ServerId = results.Attribute("server").Value.ToString(),
                         Secret = results.Attribute("secret").Value.ToString(),
                         Title = results.Attribute("title").Value.ToString()
                     };

        FlickrListView.ItemsSource = photos;




    }

EDITED

Current code:

enter code here:

private async void ParseFlickrResponse(HttpResponseMessage response)
{

        XDocument xml = XDocument.Parse(await response.Content.ReadAsStringAsync());          
        var photos = from results in xml.Descendants("photo").ToList()
                     select new FlickrImage
                     {
                         ImageId = results.Attribute("id").Value.ToString(),
                         FarmId = results.Attribute("farm").Value.ToString(),
                         ServerId = results.Attribute("server").Value.ToString(),
                         Secret = results.Attribute("secret").Value.ToString(),
                         Title = results.Attribute("title").Value.ToString()
                     };


        FlickrListView.ItemsSource = new ObservableCollection<FlickrImage>(photos);


    }

    private void GetPhotoSource(object sender, ItemClickEventArgs e)
    {

        int inx = FlickrListView.SelectedIndex;
       // FlickrImage t = lst.First();
        FlickrImage t = lst.ElementAt(inx);
        MyImage.Source = new BitmapImage(new Uri(t.ImageUrl.ToString(), UriKind.Absolute));  


    }

Answer 1

Try adding a .ToList() at the end of your LINQ.

*EDIT (comments summary)

You are handling ItemClick event which seems to be raised before the selection properties on the ListViewBase change. Since these are not updated at this point – you can check e.ClickedItem and cast it to FlickrImage to get your clicked item.

If you do want to work with selection properties – you should be handling the SelectionChanged event.