Bug 56816 - XAML error not caught at compile time
Summary: XAML error not caught at compile time
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.3.4
Hardware: PC Windows
: Normal minor
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2017-05-24 20:49 UTC by Brian Macomber
Modified: 2017-07-12 22:50 UTC (History)
2 users (show)

Tags: ac xamlc xaml
Is this bug a regression?: ---
Last known good build:

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Description Brian Macomber 2017-05-24 20:49:03 UTC
          <RowDefinition Height="Auto"></RowDefinition>
          <RowDefinition Height="Auto"></RowDefinition>
          <RowDefinition Height="*"></RowDefinition>
          <RowDefinition Height="Auto"></RowDefinition>
          <RowDefinition Height="Auto"></RowDefinition>
          <RowDefinition Height="Auto"></RowDefinition>6

VS 2017 15.2

I had a stray char (6 after the last RowDefinition) that should be a syntax error in my XAML.  Would compile fine for UWP and iOS, but caused a runtime KeyNotFoundException when the XAML was loaded.

I would expect this to cause a compile time error?
Comment 1 Jimmy [MSFT] 2017-05-24 23:05:01 UTC
I tested this and there is a build error thrown when XamlC is enabled: https://developer.xamarin.com/guides/xamarin-forms/xaml/xamlc/

However the error that gets thrown is

> Error: Specified cast is not valid. 

with no additional information to help indicate what caused it. Therefore I'll still confirm this report so that we can try to improve the error thrown in the future.
Comment 2 Brian Macomber 2017-05-24 23:14:16 UTC
I'll check that, it's possible this was an older XAML page, it might not have had XamlC enabled on it.

I could be helpful if the KeyNotFoundException could include the key that is missing also.  Would make it easier to track it down.