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POWPF UI not updating after incoming WCF message
 

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  1. POWPF UI not updating after incoming WCF message
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    <p>I have an MVVM app, where my ViewModel <code>PingerViewModel</code> processes incoming WCF <code>Ping()</code> messages. Processing such a message happens on a thread of <code>Scheduler.Default</code>'s thread pool. Semantically, incoming WCF messages change a bound property <code>CanPing</code> and raise the PropertyChanged event for said property.</p> <p><strong>But my UI is not updating</strong> until it receives some UI event, e.g. focusing/clicking the window, etc.<br/> <strong>How do I make it update as soon as the event is fired?</strong></p> <p>I have tried raising the PropertyChanged event...</p> <ul> <li>on the Application's Dispatcher, </li> <li>using a SynchronizationContext</li> </ul> <p>without any luck.</p> <p>I also verified that the bound property is indeed set to the proper value, and that there is indeed a listener consuming my PropertyChanged event.</p> <p>Here's some code (<a href="https://github.com/derabbink/DistrExTest" rel="nofollow">full code on github</a>):<br/> part of my view's MainWindow.xaml:<br/> It might be worth noting that the bound <code>Command</code> does not actually play a role in producing the incoming WCF message.</p> <pre><code>&lt;Button Content="Ping" Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="PingBtn" VerticalAlignment="Top" Width="75" AutomationProperties.AutomationId="Ping" IsEnabled="{Binding CanPing}" Command="{Binding PingCommand}" /&gt; </code></pre> <p>part of my views MainWindow.xaml.cs</p> <pre><code>public MainWindow() { DataContext = new PingerViewModel(); InitializeComponent(); } </code></pre> <p>part of my ViewModel</p> <pre><code>public class PingerViewModel : INotifyPropertyChanged public PingerViewModel() { Pinger = new Pinger(true); PingCommand = new PingerPingCommand(this); //... } public bool CanPing { get { if (Pinger == null) return false; return Pinger.CanPing; } } public void Ping() { _pingClient.Channel.Ping(); Pinger.CanPing = false; OnPropertyChanged("CanPing"); } protected virtual void OnPong(PongEventArgs e) { Pinger.CanPing = true; OnPropertyChanged("CanPing"); } public Pinger Pinger { get; private set; } public ICommand PingCommand { get; private set; } //... } </code></pre>
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