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Tag: source-generators

9 posts

2026-09-04 mstest native-aot testing

MSTest 4.4 Graduates the Reflection Source Generator, and Native AOT Projects Get It Automatically

MSTest 4.4 moves MSTest.SourceGeneration out of experimental and aligns it with the MSTest version. Native AOT test projects pick it up with no opt-in, ReflectionFree mode can now skip runtime discovery for plain [TestMethod] and [DataRow], and five AOTSG diagnostics tell you which test shapes will not survive.

2026-08-31 comparison automapper mapperly

AutoMapper vs Mapperly vs hand-written mapping in 2026

Mapperly is the default for new .NET code: it matches hand-written speed, survives Native AOT, and catches unmapped members at build time. AutoMapper still wins on ProjectTo. Benchmarks and license thresholds included.

2026-08-17 dotnet logging security

How to redact sensitive values from logs with LogProperties and data redaction in .NET

A complete guide to redacting classified data in source-generated logs: build a taxonomy, write a Redactor, wire EnableRedaction and AddRedaction, and understand the discriminator that silently breaks partial masking. With real output from Microsoft.Extensions.Compliance.Redaction 10.9.0.

2026-08-12 errors aspnetcore dotnet

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.

2026-08-10 csharp dotnet dotnet-11

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.

2026-08-02 csharp dotnet dotnet-11

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.

2026-06-19 csharp dotnet dotnet-11

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.

2026-05-30 migration automapper mapperly

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.

2026-04-30 csharp dotnet dotnet-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.