Bug 24584 - IMarkupExtension throws NullReferenceException if ProvideValue returns a null value
Summary: IMarkupExtension throws NullReferenceException if ProvideValue returns a null...
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.2.3
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2014-11-17 12:30 UTC by Vyacheslav Volkov
Modified: 2015-05-28 17:56 UTC (History)
4 users (show)

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

Testcase (3.76 MB, application/x-zip-compressed)
2014-11-17 12:31 UTC, Vyacheslav Volkov

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Description Vyacheslav Volkov 2014-11-17 12:30:27 UTC
IMarkupExtension throws NullReferenceException if ProvideValue returns a null value


System.NullReferenceException: Object reference not set to an instance of an object
at Xamarin.Forms.ReflectionExtensions.IsInstanceOfType (System.Type self, System.Object o) [0x00000] in <filename unknown>:0 
at Xamarin.Forms.Xaml.BaseValueNode.SetPropertyValue (System.Object xamlelement, XmlName propertyName, System.Object value, Xamarin.Forms.BindableObject rootElement) [0x00000] in <filename unknown>:0 
at Xamarin.Forms.Xaml.MarkupNode.ApplyTo (System.Object source, XmlName propertyName, Boolean dontUseLazy) [0x00000] in <filename unknown>:0 
at Xamarin.Forms.Xaml.INodeExtension.ApplyProperties (IElementNode node, System.Object source, Boolean dontUseLazy) [0x00000] in <filename unknown>:0
Comment 1 Vyacheslav Volkov 2014-11-17 12:31:28 UTC
Created attachment 8771 [details]
Comment 2 Udham Singh 2014-11-18 05:20:06 UTC
I have checked this issue and got the same exception mentioned in bug description. To reproduce this issue I have run the sample app attached in comment 1 and got the issue. 

Screencast : 

On Windows : http://www.screencast.com/t/DT9UsRlQmhKB
On Mac : http://www.screencast.com/t/vtCyI6uX

Application Output :

On Windows :  https://gist.github.com/Udham1/ebacd665f2f9f1159238
On Mac : https://gist.github.com/Udham1/a2c7a8889298bdb3960d

Environment Info :

On Windows :

Xamarin.Forms :

Windows 8
VS 2013

On Mac :

Xamarin.Forms :

OS X 10.9.4
XS 5.5.3 (build 6)
Comment 3 Eric Maupin 2015-05-28 17:56:06 UTC
This appears to be fixed in the current version.