1.1.4-pre - System.InvalidOperationException: Sequence contains no elements

[matteopiccioni]

Description

Only in In 1.1.4-pre I have the following problem:
OnAppearing, after reading items a make a new ObservableCollection I have exception

Steps to Reproduce

In viewmodel:
Mycoll = new ObservableCollection(myListObject);
I have exception: System.InvalidOperationException: Sequence contains no elements

my xaml:
I have a ContentPage, inside ContentPage I have Grid
Into Grid I have SettingsView
ItemsSource="{Binding Mycoll}"

Expected Behavior

In version 1.0.9 it works...it show a list of cells

Actual Behavior

In 1.1.4-pre I have exception:

Exception:
System.InvalidOperationException: Sequence contains no elements

" at System.Linq.Enumerable.Max (System.Collections.Generic.IEnumerable1[T] source) [0x0001d] in /Users/builder/jenkins/workspace/archive-mono/2019-08/android/release/external/corefx/src/System.Linq/src/System/Linq/Max.cs:23 \n at AiForms.Renderers.Droid.ModelProxy.AddCell (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00031] in <f3a99fabefd04b6f87e142c28cbcae58>:0 \n at AiForms.Renderers.Droid.ModelProxy.OnRootSectionCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00033] in <f3a99fabefd04b6f87e142c28cbcae58>:0 \n at (wrapper delegate-invoke) System.EventHandler1[System.Collections.Specialized.NotifyCollectionChangedEventArgs].invoke_void_object_TEventArgs(object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)\n at AiForms.Renderers.SettingsRoot.ChildCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs notifyCollectionChangedEventArgs) [0x0000b] in :0 \n at AiForms.Renderers.Section.OnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0000b] in :0 \n at (wrapper delegate-invoke) .invoke_void_object_NotifyCollectionChangedEventArgs(object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)\n at System.Collections.ObjectModel.ObservableCollection1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00018] in /Users/builder/jenkins/workspace/archive-mono/2019-08/android/release/external/corefx/src/System.ObjectModel/src/System/Collections/ObjectModel/ObservableCollection.cs:263 \n at System.Collections.ObjectModel.ObservableCollection1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2019-08/android/release/external/corefx/src/System.ObjectModel/src/System/Collections/ObjectModel/ObservableCollection.cs:338 \n at System.Collections.ObjectModel.ObservableCollection1[T].InsertItem (System.Int32 index, T item) [0x0001a] in /Users/builder/jenkins/workspace/archive-mono/2019-08/android/release/external/corefx/src/System.ObjectModel/src/System/Collections/ObjectModel/ObservableCollection.cs:196 \n at System.Collections.ObjectModel.Collection1[T].Insert (System.Int32 index, T item) [0x00027] in /Users/builder/jenkins/workspace/archive-mono/2019-08/android/release/external/corefx/src/Common/src/CoreLib/System/Collections/ObjectModel/Collection.cs:116 \n at Xamarin.Forms.TableSectionBase1[T].Insert (System.Int32 index, T item) [0x00000] in D:\\a\\1\\s\\Xamarin.Forms.Core\\TableSection.cs:81 \n at AiForms.Renderers.Section.ItemsChanged (Xamarin.Forms.BindableObject bindable, System.Object oldValue, System.Object newValue) [0x000c8] in <fc6990c546524f55bda3ede8ad1c52ea>:0 \n at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindableObject+BindablePropertyContext context, System.Object value, System.Boolean currentlyApplying, Xamarin.Forms.Internals.SetValueFlags attributes, System.Boolean silent) [0x00120] in D:\\a\\1\\s\\Xamarin.Forms.Core\\BindableObject.cs:463 \n at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x00173] in D:\\a\\1\\s\\Xamarin.Forms.Core\\BindableObject.cs:397 \n at Xamarin.Forms.Internals.TypedBinding2[TSource,TProperty].ApplyCore (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property, System.Boolean fromTarget) [0x0011b] in D:\a\1\s\Xamarin.Forms.Core\TypedBinding.cs:218 \n at Xamarin.Forms.Internals.TypedBinding2[TSource,TProperty].Apply (System.Boolean fromTarget) [0x0002e] in D:\\a\\1\\s\\Xamarin.Forms.Core\\TypedBinding.cs:108 \n at Xamarin.Forms.Internals.TypedBinding2+PropertyChangedProxy[TSource,TProperty].b__16_0 () [0x00000] in D:\a\1\s\Xamarin.Forms.Core\TypedBinding.cs:277 \n at Xamarin.Forms.DispatcherExtensions.Dispatch (Xamarin.Forms.IDispatcher dispatcher, System.Action action) [0x00028] in D:\a\1\s\Xamarin.Forms.Core\DispatcherExtensions.cs:53 \n

Platforms

• [ x] Android
• iOS

Basic Information

• AiForms.SettingsView 1.1.4-pre
• Xamarin.Forms 4.5.0.396

[Jakar510]

I'm having this issue as well.

[muak]

@matteopiccioni
Thank you for your report.

I regret to say that I couldn't reproduce it.
This issue might have been fixed on ver 1.1.8-pre.

Please try 1.1.8-pre.

If not fixed, Could you show more detailed information?

Thanks.

[muak]

@matteopiccioni
@Jakar510

I fixed it.

Thanks.