Who contributed to .NET on May 28, 2026?

5 developers shipped this update, including RikkiGibson, davidwengier, akhera99, dotnet-maestro[bot], and dependabot[bot].

What were the notable .NET updates?

Rename ClosedAttribute to IsClosedTypeAttribute, Remove dead code and project, and Report percentage progress during LSP project loading.

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The Wire · Showcase

ROSLYN CLEANS HOUSE WHILE MACIOS FIXES REDIRECT BEHAVIOR

By RepoJournal · Filed 06:05 UTC on May 28, 2026 · About .NET

5 people shipped this

RikkiGibson @RikkiGibson 1 cited

davidwengier @davidwengier 1 cited

akhera99 @akhera99 1 cited

dotnet-maestro[bot] @dotnet-maestro[bot] 1 cited

dependabot[bot] @dependabot[bot] 1 cited

The compiler team is scrubbing dead code from the runtime, and iOS handlers are getting yanked into .NET compatibility.

Roslyn shipped three significant housekeeping PRs overnight: a rename of ClosedAttribute to IsClosedTypeAttribute to align with runtime decisions [1], removal of genuinely unused code and an entire dead project [2], and new LSP progress reporting during project load [3]. On the macOS side, NSUrlSessionHandler now handles HTTP redirects like .NET handlers do, resolving credentials against the redirect target instead of the original request [4]. This is a breaking change for existing code that relied on the old behavior. The macios team also yanked support for ZeroCopyStrings from the binding generator [5], a feature that never worked properly in .NET anyway. Authentication tests got hardened with server-side request tracking [6], and GitHub workflows are now pinning action versions and dropping unnecessary credentials [7]. Winforms continues pulling in VMR updates [9], and dev-proxy bumped its Docker build action [10]. The PAT migration to WIF continues in Roslyn [8], replacing legacy service connections across the stack.

Action items

→ Review NSUrlSessionHandler redirect behavior changes before shipping iOS code dotnet/macios [plan]
→ Test any custom redirect handling that depends on original request credentials dotnet/macios [plan]
→ Monitor Roslyn main branch for LSP performance impact from progress reporting dotnet/roslyn [monitor]

References

[1] Rename ClosedAttribute to IsClosedTypeAttribute ↗ dotnet/roslyn
[2] Remove dead code and project ↗ dotnet/roslyn
[3] Report percentage progress during LSP project loading ↗ dotnet/roslyn
[4] Make NSUrlSessionHandler handle redirects like the .NET handlers do (#25529) dotnet/macios
[5] [bgen] Remove support for ZeroCopyStrings (#25515) dotnet/macios
[6] [tests] Improve new BasicAuthWorksWhenBearerIsAdvertisedFirst test. (#25503) dotnet/macios
[7] [github] Fix workflows to pin actions & drop credentials when possible. (#25545) dotnet/macios
[8] [PAT Migration] Replace devdiv/engineering SC with WIF (WI 10126) (#83723) dotnet/roslyn
[9] [main] Source code updates from dotnet/dotnet ↗ dotnet/winforms
[10] Bump docker/build-push-action from 7.1.0 to 7.2.0 ↗ dotnet/dev-proxy

Quick answers

What shipped in .NET on May 28, 2026?: The compiler team is scrubbing dead code from the runtime, and iOS handlers are getting yanked into .NET compatibility. In total, 27 commits and 28 pull requests landed.
Who contributed to .NET on May 28, 2026?: 5 developers shipped this update, including RikkiGibson, davidwengier, akhera99, dotnet-maestro[bot], and dependabot[bot].
What were the notable .NET updates?: Rename ClosedAttribute to IsClosedTypeAttribute, Remove dead code and project, and Report percentage progress during LSP project loading.

RUNTIME FIXES KERBEROS FALLBACK ON UNIX, APPHOST CONVERTS TO C

The managed SPNEGO implementation now falls back to NTLM when Kerberos credentials go missing on Linux, closing a critical auth gap that broke enterprise deployments [ref:1].

dotnet 120 shipped 1-min read

@dotnet 1 day ago

MACIOS DOCS OVERHAUL SPANS 31 TYPES, ASPNETCORE VALIDATION MOVES TO SOURCE GENERATION

Rolf Bjarne shipped 31 types with proper XML documentation across macios while aspnetcore refactors validation classes out of the public API entirely.

dotnet 25 shipped 1-min read

@dotnet 2 days ago

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dotnet 97 shipped 2-min read

@dotnet 3 days ago

COMPLEX NUMBERS NOW IEEE 754 COMPLIANT, SKILLS EVALS GO VALLY-ONLY, UNSAFE EVOLVES

Complex<T> just shipped conformance to C23 Annex G special values, dotnet/skills completed its migration to the Vally eval harness, and the language is tightening unsafe semantics ahead of C# 13.

dotnet 141 shipped 2-min read

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