Bug 53051 - Using attributes with Thickness in ResourceDictionary in App.xaml and using xaml precompiling crashes app
Summary: Using attributes with Thickness in ResourceDictionary in App.xaml and using x...
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.3.3
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Jimmy [MSFT]
Depends on:
Reported: 2017-03-04 08:48 UTC by Josha Munnik
Modified: 2017-03-14 18:51 UTC (History)
3 users (show)

Tags: android, xamlc
Is this bug a regression?: ---
Last known good build:

repro project (295.19 KB, application/x-zip-compressed)
2017-03-14 18:51 UTC, Jimmy [MSFT]

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Description Josha Munnik 2017-03-04 08:48:05 UTC
When specifying Thickness with Left/Right/Top/Bottom attributes in a ResourceDictionary in App.xaml and enabling precompiling of xaml via [assembly: XamlCompilation(XamlCompilationOptions.Compile)] will crash the app on Android (tested on Samsung S7, not tested on iOS).

To reproduce:
- create a new Cross Platform Xamarin app using PCL
- add following to App.xaml:

            <!-- <Thickness x:Key="PageMargin">10,0,10,0</Thickness> -->
            <Thickness x:Key="PageMargin" Left="10" Right="10" Bottom="0" Top="0" />

- change MainPage.xaml, and add attributes to label:

           Margin="{StaticResource PageMargin}"

Build and run on Android. 

Add [assembly: XamlCompilation(XamlCompilationOptions.Compile)] above namespace decleration in App.xaml.cs

Build and run on Android -> Crash while running InitializeComponent(); within the App constructor.

When using the first form to specify Thickness, everything works ok when using XamlCompilation.
Comment 1 Jimmy [MSFT] 2017-03-06 16:15:20 UTC
Thank you for filing this report! Let me try the steps you provided to see if can reproduce and confirm this issue. I will update the report accordingly.
Comment 2 Jimmy [MSFT] 2017-03-14 18:51:14 UTC
Created attachment 20319 [details]
repro project

I was able to reproduce this crash with the repro project I'm attaching with Forms The app would crash on all platforms upon launching. On Android the debug output showed:

> 03-14 11:23:06.697 E/mono    ( 1788): Unhandled Exception:
> 03-14 11:23:06.697 E/mono    ( 1788): System.InvalidProgramException: Invalid IL code in XamlCTest.App:InitializeComponent (): IL_0050: callvirt  0x0a00000a

### Resolution status
I tested with Forms 2.3.4-pre4 and the crash no longer occurs so this issue appears to have been fixed. If you still experience this issue with Forms 2.3.4-pre4 or later please re-open this bug and attach an updated repro project.

### Version Tests
Forms 2.3.4-pre4    GOOD
Forms     BAD