Bug 27545 - NullReferenceException when call Children.Remove() with children is custom control
Summary: NullReferenceException when call Children.Remove() with children is custom co...
Status: RESOLVED INVALID
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.3.4
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2015-03-02 05:47 UTC by Hung Bui
Modified: 2015-05-27 19:24 UTC (History)
5 users (show)

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


Attachments
Attached is sample project using Xamarin.Forms 1.3.4.6332 (77 bytes, text/plain)
2015-03-02 05:58 UTC, Hung Bui
Details


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Status:
RESOLVED INVALID

Description Hung Bui 2015-03-02 05:47:41 UTC
If children control is custom control, when remove it from parent control the null exception has been thrown.
Comment 1 Hung Bui 2015-03-02 05:58:36 UTC
Created attachment 10108 [details]
Attached is sample project using Xamarin.Forms 1.3.4.6332
Comment 2 Hung Bui 2015-03-03 02:00:48 UTC
This bug is the same as: 
Bug 21457 - NullReferenceException thrown when Custom ViewRenderer (iOS) is Disposed
Comment 3 Sadik Ali 2015-03-03 06:37:54 UTC
I have checked this issue and able to reproduce this behavior with the help of sample project given in the bug description. After launching app on simulator, I clicked on 'Open Popup' button then a click on 'Cancel' button and exception get thrown.

Screencast: http://www.screencast.com/t/GaIhRVxRbqmw
Application Output: https://gist.github.com/Arpit360/21b7428d07cbf8c76391
XVS Logs: https://gist.github.com/Arpit360/23a22e7151716e4b44a3
Mtbserver log: https://gist.github.com/sunil360/313c99b2345a0697859d

Environment Info:

Xamarin.Forms : Xamarin.Forms 1.4.0.6336-pre1.

Microsoft Visual Studio Professional 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Version 4.5.50938

Installed Version: Professional

LightSwitch for Visual Studio 2013   06177-004-0444002-02651
Microsoft LightSwitch for Visual Studio 2013

Team Explorer for Visual Studio 2013   06177-004-0444002-02651
Microsoft Team Explorer for Visual Studio 2013

Visual Basic 2013   06177-004-0444002-02651
Microsoft Visual Basic 2013

Visual C# 2013   06177-004-0444002-02651
Microsoft Visual C# 2013

Visual C++ 2013   06177-004-0444002-02651
Microsoft Visual C++ 2013

Visual F# 2013   06177-004-0444002-02651
Microsoft Visual F# 2013

Visual Studio 2013 Code Analysis Spell Checker   06177-004-0444002-02651
Microsoft® Visual Studio® 2013 Code Analysis Spell Checker

Portions of International CorrectSpell™ spelling correction system © 1993 by Lernout & Hauspie Speech Products N.V. All rights reserved.

The American Heritage® Dictionary of the English Language, Third Edition Copyright © 1992 Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

ASP.NET Web Frameworks and Tools 2012.2   4.1.21001.0
For additional information, visit http://go.microsoft.com/fwlink/?LinkID=309563

ASP.NET Web Frameworks and Tools 2013   5.2.21010.0
For additional information, visit http://www.asp.net/

Common Azure Tools   1.3
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Microsoft Azure Mobile Services Tools   1.3
Microsoft Azure Mobile Services Tools

NuGet Package Manager   2.8.50926.663
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

Office Developer Tools for Visual Studio 2013 ENU   12.0.30626
Microsoft Office Developer Tools for Visual Studio 2013 ENU

PowerShell Tools   1.3
Provides file classification services using PowerShell

PreEmptive Analytics Visualizer   1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.

SQL Server Data Tools   12.0.41012.0
Microsoft SQL Server Data Tools

Windows Phone 8.1 SDK Integration   1.0
This package integrates the tools for the Windows Phone 8.1 SDK into the menus and controls of Visual Studio.

Workflow Manager Tools 1.0   1.0
This package contains the necessary Visual Studio integration components for Workflow Manager.

Xamarin   3.9.347.0 (7016256)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android   4.20.0.34 (49a04b966feb40dfdba49d57ba16249b66d606a6)
Visual Studio plugin to enable development for Xamarin.Android.

Xamarin.iOS   8.6.2.0 (99057828cdcf91319c00a0df50ced016c066c2a2)
Visual Studio extension to enable development for Xamarin.iOS.

Xamarin.iOS Unified Migration   1.0
Automated migration for Xamarin iOS Classic projects to Unified
Comment 4 Jason Smith [MSFT] 2015-05-27 19:24:59 UTC
Use VisualElementRenderer not ViewRenderer to not mandate a call to SetNativeControl.