Bug 52902 - ListView GetEnumerator now called against IList ItemsSource upon Selection
Summary: ListView GetEnumerator now called against IList ItemsSource upon Selection
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.3.4
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Jimmy [MSFT]
Depends on:
Reported: 2017-02-28 15:52 UTC by Gerard C
Modified: 2017-03-02 13:46 UTC (History)
3 users (show)

Tags: listview
Is this bug a regression?: ---
Last known good build:

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Description Gerard C 2017-02-28 15:52:13 UTC
In 2.3.3, a ListView with an IList as ItemsSource would have the index referenced upon item selection.  In 2.3.4-pre2, selecting a ListView item triggers a call to GetEnumerator() against my IList which virtualizes an infinite list.
Comment 1 Gerard C 2017-02-28 16:20:48 UTC
I implemented GetEnumerator() and found that the ListView executes MoveNext() once then goes back to using the IList so the impact is minimal.  I just had to implement GetEnumerator() where it was not implemented before.
Comment 2 Jimmy [MSFT] 2017-03-01 17:50:52 UTC
Thank you for filing this report!
Are you implementing your own IList to use as the ItemSource? Can you attach a sample project that reproduces this issue?
Comment 3 Gerard C 2017-03-02 13:46:46 UTC
Cannot reproduce in OOB project.  Will revisit if I can find the right mixture of components from my project to reproduce.  Thanks.