System.InvalidOperationException: Cannot change ObservableCollection

Hey Andrei, I try to implement the orientation change in my app and there is an error coming up. I’m not quite sure if its a CardView bug, but when you look at the call stack it seems to be an issue there or in XF. I use the latest version of both (2.0. 6 | 3.6.0.293080)

I have to different CardViews (Carousels) each in one page. When I change pages and then change my orientation to landscape an error occurs, I think it must be about the layout and the observable collections there, since I dont use any in this page where the error occurs. (There are no problems if I don’t change orientation)

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

ObservableCollection`1[T].CheckReentrancy ()
ObservableCollection`1[T].MoveItem (System.Int32 oldIndex, System.Int32 newIndex)
ObservableCollection`1[T].Move (System.Int32 oldIndex, System.Int32 newIndex)
Layout.LowerChild (Xamarin.Forms.View view) D:\a\1\s\Xamarin.Forms.Core\Layout.cs:186
CardsView.SendChildrenToBackIfNeeded (Xamarin.Forms.View view, Xamarin.Forms.View topView)
CardsView.AddChild (Xamarin.Forms.View topView, Xamarin.Forms.View[] views)
CardsView.InitViews (PanCardView.Processors.ICardProcessor processor, PanCardView.Enums.AnimationDirection animationDirection, System.Collections.Generic.IEnumerable`1[T] bookedViews, System.Int32[] indeces)
CardsView.SetupPrevView (System.Int32 index)
CardsView.SetupBackViews (System.Nullable`1[T] index)
CardsView.SetCurrentView ()
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)

[shoeIT]

Ok, may I know which nuget package version this fix was applied…?

the current one works fine, error is gone, thanks Andrei!

[shoeIT]

thx I will se what I can do, its difficult to reproduce with a small sample