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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.
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.
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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.
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.