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When setting a Xamarin.Forms.Grid's ColumnDefinitions attributes through the .xaml code, the app crashes on a real Windows Phone 10 device, but it doesn't crash on Android nor iOS (neither on emulators nor real devices) nor on Visual Studio's Windows Phone 8 and 10 emulators.
This is the exception:
Position 13:14. Cannot assign property "ColumnDefinitions": Property does not exists, or is not assignable, or mismatching type between value and property
It also crashes if a RowDefinition is given a name in the .xaml, and again, only on a real device.
This is the whole .xaml:
<?xml version="1.0" encoding="utf-8" ?>
I'm unable to reproduce this with the provided XAML, nor when adding x:Name to a RowDefinition, running on a Lumia device with Windows 10 on it. Can you upload your project/reproduction so we can run it against a device to see if the behavior is different? Are you on a specific version of Forms, and have you checked against latest prerelease builds as well? The last suggestion would be the deletion of bin/obj/package folders as is common. I will just set this to needinfo for the time being.
I won't have access to the computer Xamarin is installed in until Monday, so I won't be able to upload it until then. The solution itself was just the empty cross platform (Xamarin.Forms) template with an added Windows 8 RT project (following https://developer.xamarin.com/guides/xamarin-forms/platform-features/windows/installation/phone/) and the xaml code I posted replacing the default code of MainPage.
I was using Xamarin.Forms 188.8.131.52 for all the projects of the solution (Android, iOS and Windows Phone projects), but I didn't try checking against other releases, although I did try emptying the bin, obj and package with the same results.
Created attachment 23592 [details]
Project with the aforementioned issue
Uploaded the project.
Found the issue, and it was on my side.
I didn't add these lines to the WinPhone project's AssemblyInfo.cs file:
Setting to resolved per the above comment.