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POC#/WPF - I can't update UI from a backgroundworker
 

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  1. POC#/WPF - I can't update UI from a backgroundworker
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    <p>I have a code that fetches tweets from a specific Twitter account using <strong>Tweetsharp</strong> library, creates instance of a custom <code>UserControl</code> and post tweet text to that <code>UserControl</code> then add it to a <code>StackPanel</code>.</p> <p>However, I have to get a lot of tweets and it seems that the application would freeze while adding user controls to the <code>StackPanel</code>. I tried using <code>BackgroundWorker</code>, but I wasn't lucky until now.</p> <p>My code :</p> <pre><code>private readonly BackgroundWorker worker = new BackgroundWorker(); // This ( UserControl ) is used in the MainWindow.xaml private void UserControl_Loaded_1(object sender, RoutedEventArgs e) { worker.DoWork += worker_DoWork; worker.RunWorkerCompleted += worker_RunWorkerCompleted; worker.RunWorkerAsync(); } private void worker_DoWork(object sender, DoWorkEventArgs e) { int usrID; var service = new TwitterService(ConsumerKey, ConsumerSecret); service.AuthenticateWith(AccessToken, AccessTokenSecret); ListTweetsOnUserTimelineOptions options = new ListTweetsOnUserTimelineOptions(); options.UserId = usrID; options.IncludeRts = true; options.Count = 10; twitterStatuses = service.ListTweetsOnUserTimeline(options); } private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { try { foreach (var item in twitterStatuses) { TweetViewer tweetViewer = new TweetViewer(); // A UserControl within another UserControl tweetViewer.Tweet = item.Text; tweetViewer.Username = "@stackoverflow"; tweetViewer.RealName = "Stack Overflow" tweetViewer.Avatar = ImageSourcer(item.Author.ProfileImageUrl); stackPanel.Children.Add(tweetViewer); } } catch (Exception ex) { MessageBox.Show(ex.Message); } } </code></pre> <p>What I want to do now is to solve the problem of not being able to perform the code contained in <strong>worker_RunWorkerCompleted</strong> within a <code>BackgroundWorker</code> but every time I try to perform it using a <code>BackgroundWorker</code> it fails &amp; gives me errors like :</p> <blockquote> <p>The calling thread must be STA, because many UI components require this.</p> </blockquote> <p>I tried also using a <strong>STA System.Threading.Thread</strong> instead of the BackgroundWorker but without luck!</p> <p>What am I missing ? I'm really new to WPF and I may be ignoring something important.</p>
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    1. USAlaa Salah
    1. USAlaa Salah
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    1. COIs your background worker methods in the MainWindow class?
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    2. COCan you show how you setup the `BackgroundWorker`? on which line do you get the exception?
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    3. CO@ali Everything related to the **BackgroundWorker** is in another custom user control used within the _MainWindow_ class.
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      1. USAlaa Salah
 

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