Fix: The 'interceptors' feature is not enabled in this namespace
CS9137 comes from the Microsoft.AspNetCore.OpenApi source generator. Add InterceptorsNamespaces to every project that calls AddOpenApi, not just the one holding the PackageReference.
Tag: source-generators
6 posts
How to customize source-generated System.Text.Json serialization with a type-info resolver modifier
Attach a JsonTypeInfo modifier to a source-generated JsonSerializerContext in .NET 11: why new MyContext(options) silently drops it, the WithAddedModifier setup that works, the fast path you give up (measured), and the naming-policy trap that makes modifiers no-op.
How to replace new Regex(...) with the [GeneratedRegex] source generator in .NET 11
A complete guide to converting new Regex(pattern, RegexOptions.Compiled) into [GeneratedRegex] in .NET 11: the mechanical rewrite, partial methods vs partial properties, measured startup and throughput numbers, the SYSLIB1040-1045 diagnostics, and the two patterns where the generator silently falls back to a cached Regex.
What is a source generator and when do I need one?
A plain-language guide to C# source generators: what they actually do, how the IIncrementalGenerator pipeline works, when they beat reflection or T4, and the cases where you should not reach for one. With runnable examples on .NET 11 and C# 14.
Migrate from AutoMapper to source-generated mapping with Mapperly
A step-by-step checklist to replace AutoMapper 15 Profiles, IMapper, ForMember, and ProjectTo with Riok.Mapperly 4.3 source-generated mappers in .NET 11.
How to write a source generator for INotifyPropertyChanged
A complete guide to building your own incremental source generator for INotifyPropertyChanged in C# 14 and .NET 11: the IIncrementalGenerator pipeline, marker attributes, partial-class output, the SetProperty pattern, and how to stay AOT-friendly.