Droid: CardsView.AddChild (Xamarin.Forms.View topView, Xamarin.Forms.View[] views) System.InvalidOperationException: Cannot change ObservableCollection during a CollectionChanged event.

[JTOne123]

Hi Andrei,
I got a new exception
Version 1.5.8

CardsView.AddChild (Xamarin.Forms.View topView, Xamarin.Forms.View[] views)

System.InvalidOperationException: Cannot change ObservableCollection during a CollectionChanged event.
ObservableCollection`1[T].CheckReentrancy ()
ObservableCollection`1[T].InsertItem (System.Int32 index, T item)
Collection`1[T].Insert (System.Int32 index, T item)
ObservableWrapper`2[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 ()
AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state)
SyncContext+<>c__DisplayClass2_0.<Post>b__0 ()
Thread+RunnableImplementor.Run ()
IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this)
(wrapper dynamic-method) System.Object.d101e837-9e54-4ce7-ac07-2fd099217b2b(intptr,intptr)

[AndreiMisiukevich]

Hi, do you change your itemsSource elements at your code?
I think you should do it in main thread

[AndreiMisiukevich]

indeed.. every layout is observable collection...
But that is strange we getting crashes, however I add lock(_childLocker) in all places, where we interact with Children collection.

So, I think, this is Xamarin.Forms bug, probably it would be great idea to send them an issue.
From my side, i will try to catch this type of exception, and retry adding.

The same exception, as I see SimonSimCity/Xamarin-CrossDownloadManager#9

[JTOne123]

I guess you are right

[AndreiMisiukevich]

1.6.1