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POSetting a WPF button to visible within an IConnectionPoint event handler
 

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  1. POSetting a WPF button to visible within an IConnectionPoint event handler
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    <p>I'm fairly new to C# and WPF programing and right now this problem is giving me headaches.</p> <p><strong>What the program should do:</strong> The program displays a welcome screen with a text box, where a customer can enter his name. If the device comes near a Wireless Lan Access Points and connects successfully, a "Start" button on this main window should become visible.</p> <p><strong>What's not working:</strong> Setting the button visibility inside the event handler. The new style does not get applied. Furthermore, if I try to call any other code after setting the visibility attribute/property(?) it won't run (if I put a MessageBox.Show right before setting the visib. it will be shown, if I put it after setting the property, this code won't even be reached any more).</p> <p><strong>The code:</strong></p> <p>This is the button Element:</p> <pre><code>&lt;Button Height="72" HorizontalAlignment="Center" Margin="319,507,315,0" Name="buttonStart" VerticalAlignment="Top" Width="168" FontSize="32" Content="Los geht's" Click="buttonStart_Click" /&gt; </code></pre> <p>This is the event handler registration within the MainWindow.xaml.cs</p> <pre><code>public partial class MainWindow : Window, INetworkListManagerEvents { private INetworkListManager nlm_; private IConnectionPoint nlmICP_; private int nlmCookie_ = 0; private void InitNetManager() { nlm_ = new NetworkListManager(); IConnectionPointContainer icpc = (IConnectionPointContainer)nlm_; Guid tempGuide = typeof(INetworkListManagerEvents).GUID; icpc.FindConnectionPoint(ref tempGuide, out nlmICP_); nlmICP_.Advise(this, out nlmCookie_); } </code></pre> <p>And finally, the event handler:</p> <pre><code> public void ConnectivityChanged(NLM_CONNECTIVITY newConnectivity) { if (newConnectivity == NLM_CONNECTIVITY.NLM_CONNECTIVITY_DISCONNECTED || ((int)newConnectivity &amp; (int)NLM_CONNECTIVITY.NLM_CONNECTIVITY_IPV4_NOTRAFFIC) != 0) { MessageBox.Show("Disconnected"); // this will code is reached buttonStart.Visibility = Visibility.Hidden; // this is not getting applied MessageBox.Show("Disconnected"); // this will code is not reached (stepped with debugger) } if ((((int)newConnectivity &amp; (int)NLM_CONNECTIVITY.NLM_CONNECTIVITY_IPV4_LOCALNETWORK) != 0) || (((int)newConnectivity &amp; (int)NLM_CONNECTIVITY.NLM_CONNECTIVITY_IPV4_INTERNET) != 0)) { MessageBox.Show("Connected"); // see comments above buttonStart.Visibility = Visibility.Visible; } } </code></pre> <p>That's it - I hope you can help me.</p> <p>Thank you very much in advance for your efforts!</p>
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