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Created attachment 11312 [details]
Page with ListView on WinPhone throws ArgumentException when navigating back.
Message: A first chance exception of type 'System.ArgumentException' occurred in System.Windows.ni.dll
Additional information: Value does not fall within the expected range.
Please see attached call stack for more information.
This is only an issue on WinPhone, Android and iOS perform as expected.
This is a show stopper for a high profile product launch. Please advise if this will be fixed or if more information is required.
Also tested on Xamarin.Forms 184.108.40.20656-pre1 and the issue is the same.
Thank you for taking the time to submit the bug. We tried to reproduce the issue you reported but were unable given the description. If you could please attach a reproduction to the bug by starting with a clean Xamarin.Forms project and adding just the code necessary to demonstrate the issue we would very much appreciate it. We monitor recently touched NEEDS INFO bugs so we’ll notice you attached the reproduction we’ll take it from there.
Xamarin Forms Team
It appears to be related to clearing the ObservableCollection in OnDisappearing. Android and iOS behave as expected, WinPhone throws ArgumentException.
Repro sent privately, setting back to new.
Thank you for taking the time to submit this report. After reviewing the description of this bug, we believe it no longer affects the current version of Xamarin.Forms. If you are still experiencing the issue after updating your packages, please reopen this report with an attached reproduction.
For your convenience, we have created some reproduction best practices viewable here: https://gist.github.com/jassmith/92405c300e54a01dcc6d
Xamarin Forms Team