dotnet-roslyn-analyzers
dotnet-roslyn-analyzers
Guidance for authoring custom Roslyn analyzers, code fix providers, code refactoring providers, and diagnostic suppressors. Covers project setup, DiagnosticDescriptor conventions, analysis context registration, code fix actions, code refactoring actions, multi-Roslyn-version targeting (3.8 through 4.14), testing with Microsoft.CodeAnalysis.Testing, NuGet packaging, and performance best practices.
Scope boundary: This skill covers writing analyzers. For consuming and configuring existing analyzers (CA rules, EditorConfig severity, third-party packages), see [skill:dotnet-add-analyzers]. For authoring source generators (IIncrementalGenerator, syntax providers, code emission), see [skill:dotnet-csharp-source-generators]. Analyzers and source generators share the same NuGet packaging layout (analyzers/dotnet/cs/) and Microsoft.CodeAnalysis.CSharp dependency, but serve different purposes: analyzers report diagnostics, generators emit code.
Cross-references: [skill:dotnet-csharp-source-generators] for shared Roslyn packaging concepts and IIncrementalGenerator patterns, [skill:dotnet-add-analyzers] for consuming and configuring analyzers, [skill:dotnet-testing-strategy] for general test organization and framework selection, [skill:dotnet-csharp-coding-standards] for naming conventions applied to analyzer code.
Project Setup
Analyzer projects must target netstandard2.0. The compiler loads analyzers into various host processes (Visual Studio on .NET Framework/Mono, MSBuild on .NET Core, dotnet build CLI) -- targeting net8.0+ breaks compatibility with hosts that do not run on that runtime.
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netstandard2.0</TargetFramework>
<EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
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