C#•2d ago

Roslyn Incremental CodeGen from text files not working

I wrote this codegen dll for internal use in the project, but i cannot reference the generated source code in the "CodeGen" project Referencing it from "Common" project:

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

  <ItemGroup>
    <ProjectReference Include="..\CodeGen\CodeGen.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
  </ItemGroup>
</Project>

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

  <ItemGroup>
    <ProjectReference Include="..\CodeGen\CodeGen.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
  </ItemGroup>
</Project>

The "CodeGen" csproj:

<Project Sdk="Microsoft.NET.Sdk">
  <Import Project="../Shared.props" />

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
  </PropertyGroup>

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

  <ItemGroup>
    <None Include="$(OutputPath)\$(AssemblyName).dll" Pack="true"  PackagePath="analyzers/dotnet/cs" Visible="false" />
  </ItemGroup>

  <ItemGroup>
    <AdditionalFiles Include="../cloudflare-ips-v4.txt" />
    <AdditionalFiles Include="../cloudflare-ips-v6.txt" />
  </ItemGroup>
</Project>

<Project Sdk="Microsoft.NET.Sdk">
  <Import Project="../Shared.props" />

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
  </PropertyGroup>

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

  <ItemGroup>
    <None Include="$(OutputPath)\$(AssemblyName).dll" Pack="true"  PackagePath="analyzers/dotnet/cs" Visible="false" />
  </ItemGroup>

  <ItemGroup>
    <AdditionalFiles Include="../cloudflare-ips-v4.txt" />
    <AdditionalFiles Include="../cloudflare-ips-v6.txt" />
  </ItemGroup>
</Project>

The codegen source:

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
using System.Text;

namespace OpenShock.CodeGen;

[Generator]
internal class CloudflareProxiesGenerator : IIncrementalGenerator
{
    private const string IpV4Name = "cloudflare-ips-v4.txt";
    private const string IpV6Name = "cloudflare-ips-v6.txt";

    public void Initialize(IncrementalGeneratorInitializationContext context)
    {
        var additionalFiles = context.AdditionalTextsProvider
            .Where(file => file.Path.EndsWith(IpV4Name) || file.Path.EndsWith(IpV6Name))
            .Collect();

        context.RegisterSourceOutput(additionalFiles, (ctx, files) =>
        {
            var ipv4Lines = files.FirstOrDefault(f => f.Path.EndsWith(IpV4Name))?.GetText()?.Lines.Select(l => l.ToString().Trim()).Where(l => !string.IsNullOrEmpty(l)) ?? [];
            var ipv6Lines = files.FirstOrDefault(f => f.Path.EndsWith(IpV6Name))?.GetText()?.Lines.Select(l => l.ToString().Trim()).Where(l => !string.IsNullOrEmpty(l)) ?? [];

            var sourceBuilder = new StringBuilder();
            sourceBuilder.AppendLine("using IPNetwork = Microsoft.AspNetCore.HttpOverrides.IPNetwork;");
            sourceBuilder.AppendLine();
            sourceBuilder.AppendLine("namespace OpenShock;");
            sourceBuilder.AppendLine();
            sourceBuilder.AppendLine("public static class CloudflareProxies");
            sourceBuilder.AppendLine("{");
            sourceBuilder.AppendLine("    public static readonly IPNetwork[] PrefetchedCloudflareProxies = [");

            sourceBuilder.AppendLine("        // IPv4");
            foreach (var line in ipv4Lines)
                sourceBuilder.AppendLine($"        IPNetwork.Parse(\"{line}\"),");

            sourceBuilder.AppendLine("\n        // IPv6");
            foreach (var line in ipv6Lines)
                sourceBuilder.AppendLine($"        IPNetwork.Parse(\"{line}\"),");

            sourceBuilder.AppendLine("    ];");
            sourceBuilder.AppendLine("}");

            ctx.AddSource("CloudflareProxies.g.cs", SourceText.From(sourceBuilder.ToString(), Encoding.UTF8));
        });
    }
}

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
using System.Text;

namespace OpenShock.CodeGen;

[Generator]
internal class CloudflareProxiesGenerator : IIncrementalGenerator
{
    private const string IpV4Name = "cloudflare-ips-v4.txt";
    private const string IpV6Name = "cloudflare-ips-v6.txt";

    public void Initialize(IncrementalGeneratorInitializationContext context)
    {
        var additionalFiles = context.AdditionalTextsProvider
            .Where(file => file.Path.EndsWith(IpV4Name) || file.Path.EndsWith(IpV6Name))
            .Collect();

        context.RegisterSourceOutput(additionalFiles, (ctx, files) =>
        {
            var ipv4Lines = files.FirstOrDefault(f => f.Path.EndsWith(IpV4Name))?.GetText()?.Lines.Select(l => l.ToString().Trim()).Where(l => !string.IsNullOrEmpty(l)) ?? [];
            var ipv6Lines = files.FirstOrDefault(f => f.Path.EndsWith(IpV6Name))?.GetText()?.Lines.Select(l => l.ToString().Trim()).Where(l => !string.IsNullOrEmpty(l)) ?? [];

            var sourceBuilder = new StringBuilder();
            sourceBuilder.AppendLine("using IPNetwork = Microsoft.AspNetCore.HttpOverrides.IPNetwork;");
            sourceBuilder.AppendLine();
            sourceBuilder.AppendLine("namespace OpenShock;");
            sourceBuilder.AppendLine();
            sourceBuilder.AppendLine("public static class CloudflareProxies");
            sourceBuilder.AppendLine("{");
            sourceBuilder.AppendLine("    public static readonly IPNetwork[] PrefetchedCloudflareProxies = [");

            sourceBuilder.AppendLine("        // IPv4");
            foreach (var line in ipv4Lines)
                sourceBuilder.AppendLine($"        IPNetwork.Parse(\"{line}\"),");

            sourceBuilder.AppendLine("\n        // IPv6");
            foreach (var line in ipv6Lines)
                sourceBuilder.AppendLine($"        IPNetwork.Parse(\"{line}\"),");

            sourceBuilder.AppendLine("    ];");
            sourceBuilder.AppendLine("}");

            ctx.AddSource("CloudflareProxies.g.cs", SourceText.From(sourceBuilder.ToString(), Encoding.UTF8));
        });
    }
}

15 Replies

Thinker•2d ago

What exactly is it you cannot reference in the generator project?

HeavenVROP•2d ago

not in the generator project, in Common project

Thinker•2d ago

Right, so it works as intended. You can't reference generated code inside the generator which generates that code.

HeavenVROP•2d ago

but shouldnt it generate the code in the common project and not internally? the generator is supposed to generate the file and add it to the common projects references i dont want to use it in the codegen project, that doesnt make sense

Thinker•2d ago

yes it should

HeavenVROP•2d ago

then why doesnt it work? :catthinking:

Thinker•2d ago

Does it compile if you build it from the comnand line?

HeavenVROP•2d ago

i have never built from command line it builds from IDE and if i make the generator output invalid syntax the common project fails to build so thats a good sign wait it builds my ide just doesnt want to work properly intellisens is confused no nevermind im not sure if it works

Thinker•2d ago

This is pretty common with SGs You can try restarting VS and clearing the cache

HeavenVROP•2d ago

didnt work but i dont think the compilation works properly either

HeavenVROP•2d ago

tried putting this in the list of ips

HeavenVROP•2d ago

and added this

HeavenVROP•2d ago

compilation still succeeds

333fred•22h ago

Your additional files needs to be in the consuming project, not the generator project

HeavenVROP•6h ago

Which I did 🤔

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Roslyn Incremental CodeGen from text files not working

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