Windows phone refresh listbox ItemsSource

Question

I have a problem with a RSS feed app. When my app launches, the listbox gets the feeds and show them in my listbox, but when i press my refresh button the listbox never updates, it just show the same items again, but if i close the app, and then relaunch it, it will show the latest feeds. I hope there is someone that can help. Thanks.

MainWindow.xaml:

<ListBox Grid.Row="1" Name="feedListBox" ScrollViewer.VerticalScrollBarVisibility="Auto" SelectionChanged="feedListBox_SelectionChanged">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            ...
                            ...
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>

MainWindow.cs:

private void appBarRefresh_Click(object sender, EventArgs e)
    {
        feedListBox.ItemsSource = null;

        GetFeed(IsolatedStorageSettings.ApplicationSettings["key"].ToString());
    }

private void GetFeed(string rss)
    {
        WebClient webClient = new WebClient();

        webClient.DownloadStringAsync(new System.Uri(rss));
        webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted);
    }

private void webClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
        if (e.Error != null)
        {
            Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
                MessageBox.Show(e.Error.Message);
            });
        }
        else
        {
            this.State["feed"] = null;
            this.State.Clear();
            this.State["feed"] = e.Result;

            UpdateFeedList(e.Result);
        }
    }

private void UpdateFeedList(string feedXML)
    {
        StringReader stringReader = new StringReader(feedXML);
        XmlReader xmlReader = XmlReader.Create(stringReader);
        SyndicationFeed feed = SyndicationFeed.Load(xmlReader);

        Deployment.Current.Dispatcher.BeginInvoke(() =>
        {
            feedListBox.ItemsSource = feed.Items;
        });
        ;
    }

Bump... Is there someone who can help... – Thunder Mar 09 '14 at 20:52 — Thunder, Mar 09 '14 at 20:52

score 1 · Answer 1 · answered Mar 07 '14 at 09:44

1

Try this in UpdateFeedList(string feedXML)

feedListBox.ItemsSource = null;
feedListBox.ItemsSource = feed.Items;

answered Mar 07 '14 at 09:44

bit

4,407
1
28
50

score 0 · Answer 2 · edited May 23 '17 at 10:28

0

Is your list implementing INotifyCollectionChanged? If it's not an ObservableCollection, then changes to it's contents will not automatically be reflected in the UI.

More info at the following thread

edited May 23 '17 at 10:28

Community

1
1

answered Mar 07 '14 at 09:44

Krekkon

1,349
14
35

No it is not, im not sure how to implement INotifyCollectionChanged. – Thunder Mar 07 '14 at 11:01

Windows phone refresh listbox ItemsSource

2 Answers2