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POUI Thread/Dispatcher Issue (BeginInvoke)
 

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  1. POUI Thread/Dispatcher Issue (BeginInvoke)
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    <p>In a previous question I asked how to get access to UI elements in a callback thread. I got a lot of good answers, one of which was to implement a wrapper class such as this:</p> <pre><code>public static class UIThread { private static readonly Dispatcher Dispatcher; static UIThread() { Dispatcher = Deployment.Current.Dispatcher; } public static void Invoke(Action action) { if (Dispatcher.CheckAccess()) { action.Invoke(); } else { Dispatcher.BeginInvoke(action); } } } </code></pre> <p>And you can call this using</p> <pre><code>UIThread.Invoke(() =&gt; TwitterPost.Text = "hello there"); </code></pre> <p>However I tried extending this by calling the following in my callback function</p> <pre><code>UIThread.Invoke(() =&gt; loadUserController(jsonObject)); </code></pre> <p>with the following method:</p> <pre><code>private void loadUserController(JObject jsonObject) { string profile_image_url = (string)jsonObject["profile_image_url"]; string screen_name = (string)jsonObject["screen_name"]; string name = (string)jsonObject["name"]; string location = (string)jsonObject["location"]; int statuses_count = (int)jsonObject["statuses_count"]; if (!string.IsNullOrEmpty(profile_image_url)) { ProfileImage.Source = new BitmapImage(new Uri("blahblahbalhb.jpg", UriKind.Absolute)); } // Set the screen name and display name if it differs if (!string.IsNullOrEmpty(name) &amp;&amp; !string.IsNullOrEmpty(screen_name)) { ScreenName.Text = screen_name; if (!screen_name.Equals(name)) { _Name.Text = name; } } if (!string.IsNullOrEmpty(location)) { Location.Text = location; } Tweets.Text = statuses_count.ToString() + " Tweets"; } </code></pre> <p>then the image will not render until another action forces a redraw (clicking a button) but the text controls will be updated. If within my callback function I call setImageFile(string imageFile) which is implemented as:</p> <pre><code>private void setImageFile(string imageFile) { if (this.Dispatcher.CheckAccess()) { ProfileImage.Source = new BitmapImage(new Uri("fdsfdfdsf.jpg", UriKind.Absolute)); } else { this.Dispatcher.BeginInvoke(new Action&lt;string&gt;(setImageFile), imageFile); } } </code></pre> <p>then the image will be rendered immediately. Why is this happening? What properties of the Dispatcher am I not fully understanding?</p>
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