How to get rid of line number error after installing Visual Studio 2022 Q&A

Questions
1

After installation of .NET 6 and Visual Studio 2022 I get errors like: The line number specified for #line directive is missing or invalid on build when using Visual Studio 2019:

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Litium version: 8.0

2

Remove the line <LangVersion>latest</LangVersion> from the file \Src\Directory.Build.props:

<Project>
  <PropertyGroup>
-     <LangVersion>latest</LangVersion>
  </PropertyGroup>
</Project>

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1 Like
3

You can also set it to 9.0 of the c# specification

<Project>
  <PropertyGroup>
-     <LangVersion>latest</LangVersion>
+     <LangVersion>9.0</LangVersion>
  </PropertyGroup>
</Project>
4

This is not related to Litium version but to the target framework version. And the error is there because the LangVersion points to the latest version of c# specification. Now with .NET 6 the c# version 10 was released and will be installed together with .NET, this will also impact other sites that using the LangVersion set to latest and pinning the LangVersion to 9 it will be the same behaviour as before .NET 6 was released.

5

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