Let’s Build an Incremental Source Generator With Roslyn

on YouTube ↗01h 15m

" summary

Live-coding builds an IIncrementalGenerator for Roslyn (targets .NET 6 / C# 10) that auto-generates partial IEqualityComparer implementations for specified types, emitting a marker attribute via post-initialization, using the syntax-provider predicate+semantic transform pipeline to extract type symbols. Tests run with Microsoft.CodeAnalysis.CSharp.SourceGenerators.Testing.XUnit and mutation testing via Stryker.NET. Benchmarks show the generated comparer removes reflection for structs and yields zero allocation lookups; the incremental pipeline avoids regenerating unchanged files, improving IDE responsiveness.

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" chapters (13)

1. 0:00Introduction
2. 2:29Roslyn and Source Generators
3. 9:05Source Generation rules
4. 13:00ISourceGenerator to IncrementalGenerator
5. 13:44Equality Comparer Generator
6. 27:56IncrementalGenerator interface
7. 33:28Incremental Pipeline
8. 47:09Equality Comparer Code
9. 51:28Testing and debugging
10. 56:10Benefits of generated comparer
11. 1:00:09Incremental generation power
12. 1:04:59Source Generators best practices
13. 1:06:25Q&A

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