Is CoreDispatcher the WinRT equivalent to WPF Dispatcher in win8 app store apps? - marshalling

Question

In implementing a producer consumer pattern with an ObservableCollection in WPF I've used marshaling techniques like in this example to ensure that the collection's events get dispatched on the UI thread as items are being created on a worker thread.
In winrt I can see how marshaling using Dispatcher like this:
public void AddItem<T>(ObservableCollection<T> oc, T item)
{
if (Dispatcher.CheckAccess())
{
oc.Add(item);
}
else
{
Dispatcher.Invoke(new Action(t => oc.Add(t)), DispatcherPriority.DataBind, item);
}
}
could switch to CoreDispatcher like this:
public async void AddItem<T>(ObservableCollection<T> oc, T item)
{
if (Dispatcher.HasThreadAccess)
{
oc.Add(item);
}
else
{
Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => { oc.Add(item); });
}
}
Is that an appropriate use of CoreDispatcher?
Is there a better way to do this for a basic concurrent producer/consumer pattern in winrt?
Without the same static accessor method as Dispatcher do I need to pass CoreDispatcher down from the UI into the marshaling code?

Answer 1

Here's what I've done:
public Screen(IPreConfigurationService preConfigurationService, INavigationService navigationService)
{
_preConfigurationService = preConfigurationService;
_navigationService = navigationService;
if (!IsInDesignMode)
_currentDispatcher = CoreWindow.GetForCurrentThread().Dispatcher;
}
public string UserMessage
{
get { return _userMessage; }
set
{
_userMessage = value;
SafelyRaisePropertyChanged("UserMessage");
}
}
protected void SafelyRaisePropertyChanged(string message)
{
if (!IsInDesignMode)
_currentDispatcher.RunAsync(CoreDispatcherPriority.Normal, () => RaisePropertyChanged(message));
}
protected void ExecuteOnDispatcher(Action action)
{
_currentDispatcher.RunAsync(CoreDispatcherPriority.Normal, action.Invoke);
}
protected void SendUserMessage(string message)
{
UserMessage = message;
_currentDispatcher.RunAsync(CoreDispatcherPriority.Normal, () => AlertOnError(message));
}