dotnet-csharp-source-generators

To build a Roslyn source generator, create a .NET project targeting netstandard2.0 and implement IncrementalGenerator patterns using syntax providers and semantic analysis to generate code at compile time.

An incremental generator uses a pipeline of syntax providers and semantic analysis to cache and filter nodes, reducing redundant computations compared to standard source generators that re-evaluate entire syntax trees.

Testing Roslyn source generators involves verifying the generated C# source code and ensuring custom diagnostics are correctly reported during compilation, typically by validating generated output against expected syntax trees.

Built-in source generators like GeneratedRegex and LoggerMessage are consumed by applying their specific attributes to C# methods, which automatically generates optimized source code during compilation without manual implementation.

Yes, Roslyn source generator projects must target netstandard2.0 to ensure compatibility with the compiler environment, allowing the generated analyzer to be loaded correctly across different .NET project versions.

Packaging a Roslyn source generator for library users requires configuring the project as an analyzer, targeting netstandard2.0, and distributing it via NuGet so the compiler automatically loads the generator and runs diagnostics.