Who contributed to .NET on May 30, 2026?

4 developers shipped this update, including davidwrighton, kimpenhaus, rcj1, and filzrev.

What were the notable .NET updates?

Simplify/Improve the HashMap/PtrHashMap/EEHashTable, fix: enable validation rules to also be placed on classes, and [cDAC] Prepare for dacdbi stackwalk.

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RUNTIME CUTS HASH TABLE OVERHEAD AS OPERATOR SDK FIXES VALIDATION RULES

By RepoJournal · Filed 06:04 UTC on May 30, 2026 · About .NET

4 people shipped this

filzrev @filzrev 2 cited

davidwrighton @davidwrighton 1 cited

kimpenhaus @kimpenhaus 1 cited

rcj1 @rcj1 1 cited

The runtime team shipped efficiency gains across core hash table implementations while the operator SDK closes a validation gap that blocked class-level rules.

The dotnet/runtime team landed a significant refactor of HashMap, PtrHashMap, and EEHashTable [1], removing unused replacement functions and switching to more efficient Gethash implementations without virtual function overhead. This moves the needle on hot path performance in the type system. Separately, the cDAC team prepared for DacDbi stackwalk APIs [3] by refactoring the stackwalking iterator to surface native marker frames, laying groundwork for debugger improvements in the next release. The operator SDK fixed a critical gap [2] where validation rules couldn't be placed on classes, resolving issue #1122 and unblocking users who need attribute-based validation at the class level. On the build side, BenchmarkDotNet migrated away from the broken Cake.Git package [4] to avoid metadata corruption warnings, and temporarily disabled flaky disassembly tests on macOS x64 [5] pending a deeper investigation into the SIGSEGV issue. MAUI cleaned up duplicate @ prefixes in GitOps issue author placeholders [6] after an upstream change duplicated the logic.

Action items

→ Update operator SDK and deploy - validation rules on classes now supported dotnet/dotnet-operator-sdk [plan]
→ Rebuild BenchmarkDotNet projects to pick up Cake.Frosting.Git migration dotnet/BenchmarkDotNet [plan]
→ Monitor macOS x64 disassembly test results as team investigates root cause dotnet/BenchmarkDotNet [monitor]
→ Review iOS build properties docs for Xcode 26.5 compatibility dotnet/docs-mobile [plan]

References

[1] Simplify/Improve the HashMap/PtrHashMap/EEHashTable ↗ dotnet/runtime
[2] fix: enable validation rules to also be placed on classes ↗ dotnet/dotnet-operator-sdk
[3] [cDAC] Prepare for dacdbi stackwalk ↗ dotnet/runtime
[4] chore: Migrate Cake.Git package to Cake.Frosting.Git ↗ dotnet/BenchmarkDotNet
[5] chore: Add setting to skip disassembly tests on macos(x64) ↗ dotnet/BenchmarkDotNet
[6] Remove duplicate @ prefix from issueAuthor in GitOps (#34834) dotnet/maui

Quick answers

What shipped in .NET on May 30, 2026?: The runtime team shipped efficiency gains across core hash table implementations while the operator SDK closes a validation gap that blocked class-level rules. In total, 38 commits and 38 pull requests landed.
Who contributed to .NET on May 30, 2026?: 4 developers shipped this update, including davidwrighton, kimpenhaus, rcj1, and filzrev.
What were the notable .NET updates?: Simplify/Improve the HashMap/PtrHashMap/EEHashTable, fix: enable validation rules to also be placed on classes, and [cDAC] Prepare for dacdbi stackwalk.

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