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POPrism region view display on demand, how to refresh controls in active view
 

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    <p>I am writing an application using WPF, MVVM, and PRISM regions.</p> <p>I have two regions with one view (A and B) per region. I add views to my regions in my regionmodules class as follows:</p> <pre><code> // I use the following private properties in both regionmodules.cs class private readonly IUnityContainer _container; private readonly IRegionManager _regionManager; </code></pre> <p>--A--</p> <pre><code> private void RegisterViews() { var controlsView = _container.Resolve&lt;EmulatorControlsView&gt;(); _regionManager.Regions["ControlsRegion"].Add(controlsView, "A"); } </code></pre> <p>--B--</p> <pre><code> private void RegisterViews() { var templatesView = _container.Resolve&lt;TemplatesView&gt;(); _regionManager.Regions["TemplatesRegion"].Add(templatesView, "B"); var view = _regionManager.Regions["TemplatesRegion"].GetView("B"); _regionManager.Regions["TemplatesRegion"].Deactivate(view); } </code></pre> <p>I deactivate view "B" during initialization of my app because view B overlays view A in my shell.xaml.</p> <p>A click command from view A will activate view B and deactivate view A per the following code:</p> <pre><code> private void LoadTemplateExecute() { var controlView = _regionManager.Regions["ControlsRegion"].GetView("A"); _regionManager.Regions["ControlsRegion"].Deactivate(controlView); var templateView = _regionManager.Regions["TemplatesRegion"].GetView("B"); _regionManager.Regions["TemplatesRegion"].Activate(templateView); } </code></pre> <p>Other button commands exist in my Templates region view model that Deactivates view A and Activates view B. </p> <p>This code works great, and allows me to display my views on demand. </p> <p>Problem: View B has a ListView bound to an ObservableCollection in the view model via dependency property. I currently add string items to my ObservableCollection by way of the view model constructor:</p> <pre><code> private void InitializeTemporaryLists() { TemplateList.Add("Dog"); TemplateList.Add("Cat"); TemplateList.Add("Horse"); } </code></pre> <p>However, when view B is activated, my ObservableCollection does not show the items in its list.</p> <p><em><strong>Question</em></strong>: Is there an event available in the region view or view model to notify me when the view has become active?<br> What is the best way for me to populate data to my view from the view model each time my view becomes active?</p> <p>Any ideas and code example are very much appreciated! </p> <p><strong>* Update *</strong> My ListView was not updating because I am a silly programmer. I had not declared the ObservableCollection&lt;> type in my dependency property.</p> <p>However, I am still curious to know how you smart programmers out there might handle a prism region view activation? I wish I could subscribe to an event like the following:</p> <pre><code>_regionManager.Regions["YourRegion"].OnActiveView() += HandleActiveViewEvent; </code></pre>
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