Bug 24684 - ListView ViewCell with ContextActions throws ArgumentNullException on touch empty list row
Summary: ListView ViewCell with ContextActions throws ArgumentNullException on touch e...
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.3.0
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2014-11-19 20:53 UTC by Dez Moleski
Modified: 2014-12-02 15:18 UTC (History)
4 users (show)

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

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Description Dez Moleski 2014-11-19 20:53:57 UTC
Steps to reproduce:

1. Starting from the WorkingWithListView sample from http://developer.xamarin.com/samples/WorkingWithListview/

2. Change Xamarin.Forms packages to in WorkingWithListview && WorkingWIthListview.iOS projects

3. Edit CustomCell.cs to add the following code to the CustomCell() ctor:

ContextActions.Add(new MenuItem() {
                Text = "Delete",
                IsDestructive = true,
                Command = new Command(() => {

4. Run, select the "C# Button" tab to get to the custom cell list page, tap on an empty item.

NOTE: The swipe to reveal context buttons works fine on the populated list items; touching an unpopulated list row below those throws the exception and aborts the program.
Comment 1 Ram Chandra 2014-11-24 10:26:09 UTC
I have checked this issue and with the help of steps mentioned in bug description I am able to reproduce this issue.

I observed that when I tap on unpopulated list row XS show the "AgrumentNullReferenceException". I have check this issue on both device and simulator and getting the same behavior.

However, when I tap on populated list, I am not getting any error/exception. 

Screencast:  http://www.screencast.com/t/IdURqabiVI

Application output:https://gist.github.com/saurabh360/30066743e046bd05777c
IDE logs: https://gist.github.com/saurabh360/00548bd0bdad27067fe9
Device logs: https://gist.github.com/Mohit-Kheterpal/616d9c7c12280113d846

Xamarin.Forms:  Version pre

Environment Info:

=== Xamarin Studio ===

Version 5.5.4 (build 15)
Installation UUID: 6ea47b0d-1852-4aaf-808d-373ff0a5002b
	Mono 3.10.0 ((detached/92c4884)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 310000031

=== Xamarin.Android ===

Version: (Trial Edition)
Android SDK: /Users/jatin66/Desktop/Backup/android-sdk-macosx
	Supported Android versions:
		1.6    (API level 4)
		2.1    (API level 7)
		2.2    (API level 8)
		2.3    (API level 10)
		3.0    (API level 11)
		3.1    (API level 12)
		3.2    (API level 13)
		4.0    (API level 14)
		4.0.3  (API level 15)
		4.1    (API level 16)
		4.2    (API level 17)
		4.3    (API level 18)
		4.4    (API level 19)
		4.4.87 (API level 20)
		5.0    (API level 21)
Java SDK: /usr
java version "1.7.0_65"
Java(TM) SE Runtime Environment (build 1.7.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)

=== Apple Developer Tools ===

Xcode 6.1 (6604)
Build 6A1052d

=== Xamarin.iOS ===

Version: (Trial Edition)
Hash: 840a925
Build date: 2014-11-16 21:03:22-0500

=== Xamarin.Mac ===

Version: (Trial Edition)

=== Build Information ===

Release ID: 505040015
Git revision: f93940a35458a18052f1a25e106e62ca970d9c40
Build date: 2014-11-19 15:32:41-05
Xamarin addins: dc23cbd91a3a0e1d326328e1229e86c942a49ec8

=== Operating System ===

Mac OS X 10.10.0
Darwin Jatin66s-iMac.local 14.0.0 Darwin Kernel Version 14.0.0
    Fri Sep 19 00:26:44 PDT 2014
    root:xnu-2782.1.97~2/RELEASE_X86_64 x86_64
Comment 2 Eric Maupin 2014-12-02 15:18:50 UTC
Fixed for next 1.3 prerelease