In Xamarin BindingBase.EnableCollectionSynchronization doesn't Work

i get always on Xamarin with UWP the following Error:

The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))

I want to use:

Xamarin.Forms.BindingBase.EnableCollectionSynchronization(MyList, null, ObservableCollectionCallback);

I won't use:

Xamarin.Forms.Device.BeginInvokeOnMainThread(() => MyList.Add(DateTime.Now.ToLongTimeString()));

I have my reasons.

Here is the very simple c# ViewModel Code. You have to bind MyList in a Xamarin Project with UWP in MainPage to a ListView:

    public class MainViewModel : INotifyPropertyChanged
{
    public MainViewModel()
    {
        MyList = new ObservableCollection<string>();
        Xamarin.Forms.BindingBase.EnableCollectionSynchronization(MyList, null, ObservableCollectionCallback);
        Timer timer = new Timer(new TimerCallback(Addtext));
        timer.Change(3000, 1000);
    }
    void ObservableCollectionCallback(IEnumerable collection, object context, Action accessMethod, bool writeAccess)
    {
        lock (collection)
        {
            accessMethod?.Invoke();
        }
    }

    public void Addtext(object state)
    {
        MyList.Add(DateTime.Now.ToLongTimeString());
    }
    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    private ObservableCollection<string> MyListValue;

    public ObservableCollection<string> MyList
    {
        get { return MyListValue; }
        set
        {
            MyListValue = value;
            OnPropertyChanged();
        }
    }

is anybody here who know, what i have to do?

In Xamarin BindingBase.EnableCollectionSynchronization doesn't Work

The problem is that you invoke Addtext in the Timer. And the timer triggered in the un-uithread. If you don't want to use BeginInvokeOnMainThread, you could use Device.StartTimer to replace Timer.

Device.StartTimer(TimeSpan.FromSeconds(1),()=> {
    Addtext(this);
    return true;
} );

And please check support list, EnableCollectionSynchronization could not support UWP plafrom.