The "XamlCTask" task failed unexpectedly.

[Alex-Dobrynin]

Description

If i have datatemplate and the root of it is customview like local:SomeCustomRootViewOfTheDataTemplate and if i have there some bindings using x:Bind from CompiledBindings.Maui nuget package I get next error during the build. If i change x:Bind to Binding it just successfully builds the app.

DataTemplateWithCustomRootView.zip

this is really critical, as cannot be workarounded

Steps to Reproduce

1. Try to build provided test project

Link to public reproduction project repository

No response

Version with bug

8.0.20 SR4

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android

Affected platform versions

No response

Did you find any workaround?

nope

Relevant log output

1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018: The "XamlCTask" task failed unexpectedly.
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018: System.Xml.XmlException: 'ntView' is an unexpected token. Expecting white space. Line 12, position 108.
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at System.Xml.XmlTextReaderImpl.Throw(Exception e)
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at System.Xml.XmlTextReaderImpl.ParseAttributes()
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at System.Xml.XmlTextReaderImpl.ParseElement()
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at System.Xml.XmlTextReaderImpl.ParseElementContent()
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Xaml.XamlParser.ParseXamlElementFor(IElementNode node, XmlReader reader) in D:\a\_work\1\s\src\Controls\src\Xaml\XamlParser.cs:line 61
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Xaml.XamlParser.ReadNode(XmlReader reader, Boolean nested) in D:\a\_work\1\s\src\Controls\src\Xaml\XamlParser.cs:line 174
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Xaml.XamlParser.ParseXamlElementFor(IElementNode node, XmlReader reader) in D:\a\_work\1\s\src\Controls\src\Xaml\XamlParser.cs:line 85
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Xaml.XamlParser.ReadNode(XmlReader reader, Boolean nested) in D:\a\_work\1\s\src\Controls\src\Xaml\XamlParser.cs:line 174
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Xaml.XamlParser.ParseXamlElementFor(IElementNode node, XmlReader reader) in D:\a\_work\1\s\src\Controls\src\Xaml\XamlParser.cs:line 114
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Xaml.XamlParser.ReadNode(XmlReader reader, Boolean nested) in D:\a\_work\1\s\src\Controls\src\Xaml\XamlParser.cs:line 174
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Xaml.XamlParser.ParseXamlElementFor(IElementNode node, XmlReader reader) in D:\a\_work\1\s\src\Controls\src\Xaml\XamlParser.cs:line 114
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Xaml.XamlParser.ParseXaml(RootNode rootNode, XmlReader reader) in D:\a\_work\1\s\src\Controls\src\Xaml\XamlParser.cs:line 49
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Build.Tasks.XamlTask.ParseXaml(Stream stream, TypeReference typeReference) in D:\a\_work\1\s\src\Controls\src\Build.Tasks\XamlTask.cs:line 59
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Build.Tasks.XamlCTask.Execute(IList`1& thrownExceptions) in D:\a\_work\1\s\src\Controls\src\Build.Tasks\XamlCTask.cs:line 124
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Maui.Controls.Build.Tasks.XamlTask.Execute() in D:\a\_work\1\s\src\Controls\src\Build.Tasks\XamlTask.cs:line 38
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
1>d:\Nuget\packages\microsoft.maui.controls.build.tasks\8.0.7\buildTransitive\netstandard2.0\Microsoft.Maui.Controls.targets(154,3): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()
1>Done building project "DataTemplateWithCustomRootView.csproj" -- FAILED.

[ninachen03]

Verified this issue with Visual Studio 17.10.0 Preview 4 (8.0.14 & 8.0.20).I can repro this issue.