Creating a Source Generator results in an empty RS1042

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

---

[severity:I'm unable to use this version] [regression] [worked-in:17.14.0 preview 2]
With a project file

<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
	  <LangVersion>preview</LangVersion>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
	  <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
  </PropertyGroup>

<ItemGroup>
    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.13.0" />
  </ItemGroup>

</Project>

and content of

[Generator]
    internal class SourceGenerator : ISourceGenerator

It results in an empty error message:

C:\Dev\RPWSourceGenerator\SourceGenerator.cs(13,20,13,35): error RS1042:

---

Original Comments

Peter Smulovics on 29/3/2025, 09:51 PM:

Yes - I am aware what the error supposed to say; my report is that visual studio do not fill out the error, it actually says just:

C:\Dev\RPWSourceGenerator\SourceGenerator.cs(13,20,13,35): error RS1042:

Eg no actual error message.

Feedback Bot on 31/3/2025, 01:30 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

---

Original Solutions

Patrick Lacasse solved on 29/3/2025, 06:53 PM, undefined votes:

Hi Peter,
RS1042 means ISourceGenerator is now obsolete.
There is this new feature instead https://github.com/dotnet/roslyn/blob/main/docs/features/incremental-generators.md
I’m now reading this article https://www.thinktecture.com/en/net-core/roslyn-source-generators-high-level-api-forattributewithmetadataname/