Apr 23, 2012 at 4:46 PM
Edited Apr 23, 2012 at 4:51 PM
In in WPF application, I have multiple views with BingMaps. In case user doesnt have an Internet connection, I hide the mapping control. I am using NetworkInterface initially in shellview model to determine if Internet connection is available or not. I use
it to populate my custom INetworkConnectionAvailabilityDataProvider interface. I create a static instance of this interface and insert this as a dependency in all the user controls with BingMap. However I also use NetworkChange.NetworkAvailabilityChanged event
to determine if network is available while user is using the application. In the event, I set my INetworkConnectionAvailabilityDataProvider's boolean property to network availability. This way when my other viewmodels get the static instance of this interface,
they can determine whether to show/hide map. Is this arrangement good enough for determining network availability in all view models?
I need all the viewmodels which have BingMaps to be notified when network availability changes so that I can hide/show maps. Should I broadcast an event in shellViewModel's NetworkChange_NetworkAvailabilityChanged method and all view models with map
subscribe to it?
Or I will have to hook the NetworkChange.NetworkAvailabilityChanged event in all my view models with map?
Here is the Shell view model constructor where I am passing my custom interface as a dependency and also hooking the NetworkChange.NetworkAvailabilityChanged event.
public ShellViewModel(IWindowManager windowManager, IEventAggregator events,
Dashboard = dashboardViewModel;
Mapping = mappingViewModel;
PlanSummary = planSummaryViewModel;
Events = events;
this.Container = container;
this.windowManager = windowManager;
this.NetworkConnectionAvailabilityDataProvider = networkConnectionAvailabilityDataProvider;
this.NetworkConnectionAvailabilityDataProvider.IsNetworkConnectionAvailable = NetworkInterface.GetIsNetworkAvailable();
private void NetworkChange_NetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs args)
this.NetworkConnectionAvailabilityDataProvider.IsNetworkConnectionAvailable = args.IsAvailable;
Sounds like a perfect possibility to use the EventAggregator:
Thanks! I am using EventAggregator to publish event whenever network is available from ShellViewModel and then all other view models with map subscribe to that event.