Bug 28514 - Image fails to load when bound to a Source using a Converter if Converter is called too often.
Summary: Image fails to load when bound to a Source using a Converter if Converter is ...
Status: CONFIRMED
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.4.0
Hardware: PC Windows
: Normal minor
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2015-03-28 01:14 UTC by Jon Goldberger [MSFT]
Modified: 2017-08-29 12:21 UTC (History)
12 users (show)

Tags: ac, image, converter, binding
Is this bug a regression?: ---
Last known good build:

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Status:
CONFIRMED

Description Jon Goldberger [MSFT] 2015-03-28 01:14:50 UTC
## Description

When an image's source is bound in XAML to a Converter that provides a string with the image file name from a bound property, which is an enum, at a certain frequency of change, the image either fails to update or fails to show. 

## Steps to reproduce

1. Open the attached test project and Run on the Xamarin Android Player (or a device).

2. Observer that the image in the app changes every 500 milliseconds and is consistently updated and displayed. Should be toggling between three images. 

3. Stop the app. 

4. Open Page1.xaml and uncomment the Label so that there is a label above the image. This label is bound to the same property, using the same converter, to display the image source. 

5. Run the app again. 

Expected result: The image will get updated and displayed every 500 milliseconds when the label text changes.

Actual result: The image is not always updated nor displayed. 

## Notes

Tested using Forms 1.4.0. 

If you can not reproduce the issue with the project as is, increase the frequency of the Timer that is changing the bound property for the image source. IN  Page1.xaml.cs, change the value of the _interval member variable to a lower value... try 300 or lower. The faster it goes, the more often the issue will occur.  

I also note that the Converter is called twice for every binding that is using the converter. And even without the label, at a certain speed the image is not reliable updated, though it has to be considerably faster. Also at a certain speed even the label text starts updating more erratically. 

This issue also occurred on iOS. Did not test WinPhone.


##Environment info

Microsoft Visual Studio Ultimate 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Version 4.5.53349

Installed Version: Ultimate

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Windows Phone SDK 8.0 - ENU   06181-004-0451031-02209
Windows Phone SDK 8.0 - ENU

Application Insights Tools for Visual Studio Package   1.0
Application Insights Tools for Visual Studio

ASP.NET and Web Tools   12.4.51016.0
Microsoft Web Developer Tools contains the following components:
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ASP.NET Web Frameworks and Tools 2012.2   4.1.21001.0
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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 Advertising SDK for Windows Phone   
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Microsoft Azure HDInsight HQL Service   1.0.0000.0
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Microsoft Azure Mobile Services Tools   1.3
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Microsoft Azure Tools   2.4
Microsoft Azure Tools for Microsoft Visual Studio 2013 - v2.4.20730.1601

Microsoft Azure Tools   2.5
Microsoft Azure Tools for Microsoft Visual Studio 2013 - v2.5.21104.1601

Multilingual App Toolkit   3.1.1250.0
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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   12.0.31105
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Windows Azure Tools   2.3
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Xamarin   3.9.525.0 (ce1c740)
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Xamarin.Android   4.20.0.38 (38ac51a9d0866c7726a7484d82632c82c8221594)
Visual Studio plugin to enable development for Xamarin.Android.

Xamarin.iOS   8.8.1.0 (61fa2c6e0f2ef51eb98b8810de13b4469f379cc7)
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 2 Jon Goldberger [MSFT] 2015-03-31 22:20:39 UTC
The customer who reported this bug worked around the issue by setting the image source in the code behind and not using bindings, so it would seem that this issue is related to the xaml binding code in Forms.

They first tried to workaround the issue by binding the image source to a string property directly so no converter was needed, but the issue remained, so the issue does not seem to be with the converter after all.
Comment 3 Shane Siebken 2015-07-27 18:52:22 UTC
I seem to be having this same issue with binding an to an ImageSource in a ViewModel in a project I am currently working on.