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I am trying to use SyntaxGenerator, which is part of the Microsoft.CodeAnalysis.Workspaces package, in a source generator as an alternative to StringBuilder and SyntaxFactory. When I try to build however, I get the following error:

Generator 'IOExtensionsGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'FileNotFoundException' with message 'Could not load file or assembly 'Microsoft.CodeAnalysis.Workspaces, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.'.

My project hierarchy is split up in 3 parts: the core, the source generators, and the source generator workspace. Due to limitations imposed by Microsoft, you cannot reference Microsoft.CodeAnalysis.Workspaces inside a source generator project, hence the partitioning.

Cubusky.Core.csproj

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

  <ItemGroup>
    <ProjectReference Include="..\Cubusky.Core.SourceGenerators\Cubusky.Core.SourceGenerators.csproj" ReferenceOutputAssembly="false" OutputItemType="Analyzer" />
    <ProjectReference Include="..\Cubusky.Core.SourceGenerators.Workspaces\Cubusky.Core.SourceGenerators.Workspaces.csproj" ReferenceOutputAssembly="false" OutputItemType="Analyzer" />
  </ItemGroup>
</Project>

Cubusky.Core.SourceGenerators.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <LangVersion>8.0</LangVersion>
      
    <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
    <IsRoslynComponent>true</IsRoslynComponent>
    <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
    <IncludeBuildOutput>false</IncludeBuildOutput>
  </PropertyGroup>

  <!-- The following libraries include the source generator interfaces and types we need -->
  <ItemGroup>
    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="*" PrivateAssets="all" />
    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="*" PrivateAssets="all" />
  </ItemGroup>

  <!-- This ensures the library will be packaged as a source generator when we use `dotnet pack` -->
  <ItemGroup>
    <None Include="$(OutputPath)\$(AssemblyName).dll" Pack="true" PackagePath="analyzers/dotnet/cs" Visible="false" />
  </ItemGroup>
    
  <ItemGroup>
    <ProjectReference Include="..\Cubusky.Core.SourceGenerators.Workspaces\Cubusky.Core.SourceGenerators.Workspaces.csproj" />
  </ItemGroup>
</Project>

Cubusky.Core.SourceGenerators.Workspaces.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <LangVersion>8.0</LangVersion>
  </PropertyGroup>
    
  <!-- The following libraries include the source generator interfaces and types we need -->
  <ItemGroup>
    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="*" PrivateAssets="all" />
  </ItemGroup>
</Project>

What should I change in which csproj files in order to fix the error I'm getting?

What I've tried

For kicks, I tried changing the project reference in my Cubusky.Core.SourceGenerators.csproj to unreference the output assembly:

<ProjectReference Include="..\Cubusky.Core.SourceGenerators.Workspaces\Cubusky.Core.SourceGenerators.Workspaces.csproj" ReferenceOutputAssembly="false" />

That worked, but I (obviously) need to reference the output in order to use the SyntaxGenerator. I couldn't find a way to unreference the output assembly from Cubusky.Core.csproj.

I also tried adding a reference the same Workspace package in Cubusky.Core.csproj, but that did nothing.

<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="*" PrivateAssets="all" />

To reproduce

For anyone looking to reproduce this issue, create a solution with 3 projects structured like the above.

In your SourceGenerators.Workspaces.csproj, create a file with the following code:

public static class MyWorkspace
{
    public static void Generate(SourceProductionContext context, SyntaxNode node)
    {
        // This line of code triggers the error.
        var generator = SyntaxGenerator.GetGenerator(new AdhocWorkspace(), LanguageNames.CSharp);
    }
}

In your SourceGenerators.csproj, create a file with the following code:

[Generator]
public class MyGenerator : IIncrementalGenerator
{
    public void Initialize(IncrementalGeneratorInitializationContext context)
    {
        IncrementalValuesProvider<SyntaxNode> providers = // get providers
        context.RegisterSourceOutput(providers, MyWorkspace.Generate);
    }
}

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