Bug 59974 - ArgumentOutOfRangeException in listview with ObservableCollection async updates
Summary: ArgumentOutOfRangeException in listview with ObservableCollection async updates
Status: CONFIRMED
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms (show other bugs)
Version: 2.4.0
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2017-10-05 05:19 UTC by mailcannon
Modified: 2017-10-06 17:45 UTC (History)
2 users (show)

See Also:
Tags: observablecollection, async, ac
Is this bug a regression?: ---
Last known good build:


Attachments
repro project (751.36 KB, application/x-7z-compressed)
2017-10-05 05:19 UTC, mailcannon
Details

Description mailcannon 2017-10-05 05:19:22 UTC
Created attachment 25116 [details]
repro project

I started to search the reason of my NSInternalInconsistencyException on listview updates. And found this bug. I actually think that they are both happens from the same reason. But with this repro i can reliably rise only ArgumentOutOfRangeException.

So what you need is to bind some listview to observableCollection and remove/add items in that collection asynchronously. What i found is that if you add some elements from one thread and remove them from different thread quickly enought, app crashes. 

Reproducible both on iOS and Android. iOS is very reliable crash with add-remove interval less than 100ms. Android is quite rare: every 50ms add and every 51ms remove gives crash on 55+ iteration.

That all lead to crashes when your listview is updates from events.
Comment 1 Paul DiPietro [MSFT] 2017-10-06 17:45:18 UTC
Thanks for the reproduction project; will set to confirmed for now until further investigation can be made.

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