Briefs

We’ve released PostSharp 2027.0.1-preview, the first build of the 2027.0 line. It supports .NET 10 and .NET 11 and replaces the PostSharp Options application with a web-based interface and a postsharp command line tool, with several breaking changes. This is a preview release and is not supported in production. See the release notes.

We’ve released Metalama 2027.0.3-preview, which lets aspects introduce structs, enums, delegates, records and C# 15 unions, and supports aspects applied to unions written in target code. This is a preview release and is not supported in production. See the release notes.

We’ve released Metalama 2026.1.28 with 4 bug fixes. See the release notes.

We’ve released Metalama 2027.0.2-preview, which moves to the .NET SDK 11.0.100-rc.1 and Roslyn 5.11 and enables the C# 15 language version. It adds code model and advising support for C# 15 unions, closed classes and extension indexers, and introduces type facets in the code model. This is a preview release and is not supported in production. See the release notes.

We’ve released Metalama 2026.1.27, updating the MessagePack library embedded in the design-time components to 2.5.302, which fixes two reported vulnerabilities (CVE-2026-48109 and CVE-2026-48516). It also has two design-time bug fixes. See the release notes.

We’ve released Visual Studio Tools for PostSharp and Metalama 2026.1.8. The extension itself is unchanged; this release updates the bundled Metalama.Backstage from 2026.1.24 to 2026.1.26, so Visual Studio picks up the configuration and licensing fixes of those versions. See the GitHub release.

We’ve released Metalama 2027.0.1-preview, the first build of the 2027.0 line. It supports the .NET SDK 11.0.100-preview.7 and ships Roslyn 5.10. This is a preview release and is not supported in production. See the release notes.

We’ve released Metalama 2026.1.26 with 8 bug fixes, most of them design-time. See the release notes.

Metalama won Silver in the Software Design, Frameworks, and Modeling Tools category of the 32nd Visual Studio Magazine Reader’s Choice Awards. It is Metalama’s first award, and the tenth consecutive edition in which readers voted for one of our products. Thank you to everyone who took the time to vote. See the announcement and the full results.

We’ve released Metalama 2026.1.25, which makes unattended and evaluation-mode builds work on macOS with .NET 11. It also improves the detection of continuous integration servers, makes an unlicensed build report LAMA0806 instead of failing with MSB4018, and fixes a design-time crash in fabrics. See the release notes.

We’ve released Visual Studio Tools for PostSharp and Metalama 2026.1.7. The extension itself is unchanged; this release updates the bundled Metalama 2026.1 from 2026.1.22 to 2026.1.24, so Visual Studio picks up the configuration-system improvements of that version. See the GitHub release.

We’ve released Metalama 2026.1.24, improving the performance of the configuration system — which fixes two configuration-lock build failures — and the compile-time performance of durable references. It also merges Roslyn 5.9, adding support for the .NET SDK 10.0.400 analyzers. See the release notes.

We’ve released Metalama 2026.1.23, fixing three design-time crashes, a 2026.1.22 regression affecting [Inheritable] aspects on generic types with a struct constraint, and a series of nullability and tuple defects in the code model. It also has two breaking changes in type comparison, and updates Metalama.Compiler to 2026.1.15. See the release notes.

We’ve released Visual Studio Tools for PostSharp and Metalama 2026.1.6, a reliability pass over the Visual Studio design-time features. It fixes the two most widely-reported CodeLens defects, a crash in the options page and a package-loading failure, and restores CodeLens and the Aspect Explorer in projects referencing Metalama 2025.1 or 2025.2. See the GitHub release.

Please note that Metalama 2025.1 has reached the end of its servicing life as of August 1, 2026, and no longer receives fixes. If you are still on it, upgrade to Metalama 2026.1 LTS. See our version and support policy for details.

We’ve released PostSharp 2026.0.16 (see the GitHub release) and 2024.0.25 (see the GitHub release), removing the obsolete watermark task and fixing the Customer Experience Improvement Program uploader. 2026.0.16 adds two fixes on top, covering an invalid multicast attribute in a referenced assembly and a duplicate license key in the registry.

We’ve released Metalama 2026.1.22, a large reliability release fixing design-time memory growth, a series of design-time crashes, the reference-assembly build, and the telemetry upload. See the release notes.

We’ve released PostSharp 2026.0.15 (see the GitHub release) and 2024.0.24 (see the GitHub release) with six fixes covering caching back-end disposal hangs, compiler metadata reading and PS0264 assembly load failures, plus an EULA update to v2026-Q3.

We’ve released Metalama 2026.1.21 with 7 bug fixes, covering a design-time InvalidCastException when merging contract options across TFM-specific compile-time assemblies, a permanent hang of the design-time RPC server, a caching-invalidation hang, and [Virtualize] on abstract classes. It also updates Metalama.Compiler to 2026.1.13. See the release notes.

We’ve released Metalama 2026.1.20, fixing a FileNotFoundException when invoking a compile-time extension method from a referenced package after a dependency version change left a stale compile-time cache. See the GitHub release.