I am working on a Windows 8 application using c#/XAML. Everything has been working except for this event handler where I get the following error on this line.
await RefreshUserInfoAsync();
The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))
This Observable Collection is being updated from a push notification handler in the app class and this event handler is in my view model. I'm not using any frameworks like MVVM Light. I looked at some of the other posts on this and tried creating my own Dispatcher Helper but I received a different error where Window.Current.Dispatcher is null. Any ideas how to make this work?
private async void PushActions_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
string action = e.NewItems[0] as string;
if(action != null)
{
await RefreshUserInfoAsync();
}
}
private async Task RefreshUserInfoAsync()
{
var userInfos = await SessionRepository.GetSessionUsersWithInfoAsync(SessionGuid, RoundGuid);
this.UserInfoList = new ObservableCollection<UserInfo>(userInfos);
}
emphasized text
I talked with Jeffrey Richter and he gave me the answer. From the View Model, I can get to the Dispatcher via CoreApplication.MainView.CoreWindow.
Here is the update:
var dispatcher = CoreApplication.MainView.CoreWindow.Dispatcher;
await dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () => {
this.UserInfoList = new ObservableCollection<UserInfo>(userInfos);
});
I hope this helps someone else.
Mike
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