System.InvalidOperationException: Cannot change ObservableCollection during a CollectionChanged event.

We occasionally experience this error. Android, MvvmCross.

CardsView.AddChild (Xamarin.Forms.View topView, Xamarin.Forms.View[] views) System.InvalidOperationException: Cannot change ObservableCollection during a CollectionChanged event. ObservableCollection1[T].CheckReentrancy () ObservableCollection1[T].InsertItem (System.Int32 index, T item) Collection1[T].Insert (System.Int32 index, T item) ObservableWrapper2[TTrack,TRestrict].Insert (System.Int32 index, TRestrict item) CardsView.AddChild (Xamarin.Forms.View topView, Xamarin.Forms.View[] views) CardsView.GetViews (PanCardView.Enums.AnimationDirection animationDirection, PanCardView.Processors.ICardProcessor processor, System.Int32[] indeces) CardsView.SetupNextView () CardsView.SetupBackViews () CardsView+<SetCurrentView>d__202.MoveNext () ExceptionDispatchInfo.Throw ()

Unfortunately we do not have repro sample.

[rkotulan]

I have quite simple setup

View with CachedImage

 <panCardView:CarouselView
                ItemsSource="{Binding Items"
                SelectedIndex="{Binding CurrentIndex"
                HeightRequest="{Binding CarouselHeight">
                <panCardView:CarouselView.ItemTemplate>
                    <DataTemplate>
                        <StackLayout BackgroundColor="White" Margin="0" Padding="0">
                            <forms:CachedImage Source="{Binding }" Margin="0" />
                        </StackLayout>
                    </DataTemplate>
                </panCardView:CarouselView.ItemTemplate>

                <controls1:IndicatorsControl SelectedIndicatorStyle="{StaticResource SelectedIndicatorItemStyle}" UnselectedIndicatorStyle="{StaticResource UnSelectedIndicatorItemStyle}" />
 </panCardView:CarouselView>

ViewModel

public override async Task Initialize()
{
            await base.Initialize();
            
            if (authenticationService.IsUserAuthenticated())
            {
                var userInfo = await authenticationService.GetAuthenticatedUser();
                IsVip = userInfo.IsVip;
            }

            if (IsVip)
            {
                TescoDoubleCardItems = new ObservableCollection<string>
                                           {
                                               "VIP_TMCZ_KUPON.png",
                                               "VIP_PECIVO.png",
                                               "VIP_OVOCE.png",
                                               "VIP_MLEKO.png",
                                               "VIP_MASO.png",
                                               "VIP_DROGERIE.png"
                                           };
            }
            else
            {
                TescoDoubleCardItems = new ObservableCollection<string> { "VIP_TMCZ_KUPON.png", };
            }
}

I will try to prepare repro sample later, but problem is that app crash occasionally.

[rkotulan]

It seems to be ok. Thanks.