Question

I have a property that RaisePropertyChanged(PropName, oldValue, true, true) when I don’t have any connection to the internet no more but it throws the exception that I’m on the wrong thread.
So I want to update the property form my ViewModel but how do I get the current thread in my ViewModel or what is you proposal for a solution?

My ViewModel-ctor

public MyViewModel()
{
   // START LISTENING TO NETWORKSTATUS
   NetworkInformation.NetworkStatusChanged += OnNetworkStatusChangedHandler;
}

NetworkChanged-callback method

   private async void OnNetworkStatusChangedHandler(object sender)
   {
       ConnectionProfile profile = NetworkInformation.GetInternetConnectionProfile();

       if (profile == null)
       {
          IsRefreshEnabled = false;
       }
       else
       {
          IsRefreshEnabled = true;
       }

   }

My Property

public const string IsRefreshEnabledPropertyName = "IsRefreshEnabled";
        private bool _isRefreshEnabled = true;
        public bool IsRefreshEnabled
        {
            get { return _isRefreshEnabled; }

            set
            {
                if (_isRefreshEnabled == value) { return; }

                var oldValue = _isRefreshEnabled;
                _isRefreshEnabled = value;
                RaisePropertyChanged(IsRefreshEnabledPropertyName, oldValue, value, true);
            }
        }

Thanks in advance!

Answer 1

You need to replace the RaisePropertyChanged call to:

await Dispatcher.RunAsync(DispatcherPriority.Normal, (){RaisePropertyChanged(IsRefreshEnabledPropertyName, oldValue, value, true)});  

That will cause the call to RaisePropertyChanged to run on the UI thread.

I’m assuming that your class derives from a Xaml control (to access the Dispatcher property on the control).