Bug 24680 - Only a single Cancel() call is supported at a time exception on ImageCell.
Summary: Only a single Cancel() call is supported at a time exception on ImageCell.
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.3.0
Hardware: All Mac OS
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2014-11-19 16:39 UTC by Jessica Steger
Modified: 2016-03-25 18:36 UTC (History)
5 users (show)

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

Sample Code (6.90 KB, text/rtf)
2014-12-19 02:09 UTC, Arpit Jha

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Description Jessica Steger 2014-11-19 16:39:36 UTC
I have a ListView in Xamarin.Forms that is displaying ImageCells. The app crashes at the Main.cs file and says “Only a single Cancel() call is supported at a time." The error occurs when scrolling quickly up and down the ListView.


Comment 1 Arpit Jha 2014-12-19 02:09:10 UTC
Created attachment 9138 [details]
Sample Code

I have checked this issue and unable to reproduce it with the help of bug description.

I tried following steps to reproduce it.
1. Create a Xamarin forms application.
2. Add a class  President.cs
3.Implement code in president.cs(Implemented code written in attached file).
4.Add class ListViewDemoPage.cs 
5.Implement code in ListViewDemoPage.cs.
6.Call ListViewDemoPage.cs in App.cs
7.Set iOS as startup project.
8.Run the application.
9.Observed that Listview scrolling working fine.
10.Set android as startup project.
11.Run the application.
12.Observed that application working fine and does not crash and also observed that image on scrolling getting late on loading only in case of android.

Please let me know if i missed anything to reproduce this issue?

Could you please provide us sample app,Environment info and steps to reproduce this issue ?

Screencast : http://www.screencast.com/t/PJV7LFAyTb

Supplement Info:
 Ide logs :https://gist.github.com/Arpit360/98d828e35387d2cfce69

Environment Info:
Xamarin.forms version : 1.2.3

=== Xamarin Studio ===

Version 5.5.4 (build 15)
Installation UUID: 3d25a767-a003-4a7d-9f5e-e57987cf6cf0
	Mono 3.10.0 ((detached/92c4884)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 310000031

=== Apple Developer Tools ===

Xcode 6.1 (6602)
Build 6A1052c

=== Xamarin.Mac ===

Version: (Enterprise Edition)

=== Xamarin.Android ===

Version: (Enterprise Edition)
Android SDK: /Users/mac360_xamarin/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		2.1   (API level 7)
		2.2   (API level 8)
		2.3   (API level 10)
		3.1   (API level 12)
		4.0.3 (API level 15)
		4.4   (API level 19)
		5.0   (API level 21)
Java SDK: /usr
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

=== Xamarin.iOS ===

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

=== 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 mac360-xamarins-Mac-mini.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 Jason Smith [MSFT] 2016-03-25 18:36:58 UTC
Thank you for taking the time to submit this report. After reviewing the description of this bug, we no longer believe it 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

Warm regards,
Xamarin Forms Team