Who contributed to .NET on July 3, 2026?

6 developers shipped this update, including asundheimMSFT, jjonescz, ricardobossan, JeremyKuhne, AndriySvyryd, and DeagleGross.

What were the notable .NET updates?

[EE] Enable `using static` for non-static classes in CSharp EE, Unsafe evolution: avoid errors inside nameof, and Indeterminate and checked `ToolStripMenuItem` icons are now clearly visible in dark mode on `ContextMenuStrip`, `MenuStrip`, `StatusStrip` and `ToolStrip` drop-down buttons. (#14317).

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The Wire · Showcase

ROSLYN FIXES USING STATIC VALIDATION BUG, ASPNETCORE PATCHES CSRF PERFORMANCE HIT

By RepoJournal · Filed 06:04 UTC on July 3, 2026 · About .NET

6 people shipped this

asundheimMSFT @asundheimMSFT 1 cited

jjonescz @jjonescz 1 cited

ricardobossan @ricardobossan 1 cited

JeremyKuhne @JeremyKuhne 1 cited

AndriySvyryd @AndriySvyryd 1 cited

DeagleGross @DeagleGross 1 cited

The C# Editor & Experimental (EE) gets caught up with actual C# spec compliance, while ASP.NET Core fixes a hot-path performance regression introduced in recent CSRF middleware.

Roslyn's C# EE was rejecting `using static` on non-static named types like `System.String`, even though the language spec allows it [1]. The fix loosens the import validation check in `CompilationContext` and removes tests that were verifying incorrect behavior. Meanwhile, ASP.NET Core's `CsrfProtectionMiddleware` was unconditionally writing to `context.Items` even on the hot path where no CSRF validation applies, tanking performance when endpoints aren't wired for antiforgery checks [7]. The fix gates the dictionary write to only when necessary. Separately, the unsafe evolution work [2] refines error reporting to skip unsafe diagnostics inside `nameof` expressions, matching behavior for most members except fields. On the SDK side, a critical race condition in `UnixProcessReaper` was crashing `dotnet watch` on Ctrl+C with `ObjectDisposedException` [5]; that's now fixed. WinForms addressed dark mode rendering for checked menu items [3] and fixed a copy-paste bug in `PropertyGrid.ResetHelpForeColor` that was resetting the wrong property [4].

Action items

→ Review and test Roslyn C# EE changes if you maintain language tooling or have custom binding logic dotnet/roslyn [plan]
→ Verify ASP.NET Core CSRF middleware performance in staging if you're on a recent build dotnet/aspnetcore [monitor]
→ Update `dotnet watch` and SDK if you hit ObjectDisposedException on Ctrl+C on Linux/macOS dotnet/sdk [plan]

References

[1] [EE] Enable `using static` for non-static classes in CSharp EE ↗ dotnet/roslyn
[2] Unsafe evolution: avoid errors inside nameof ↗ dotnet/roslyn
[3] Indeterminate and checked `ToolStripMenuItem` icons are now clearly visible in dark mode on `ContextMenuStrip`, `MenuStrip`, `StatusStrip` and `ToolStrip` drop-down buttons. (#14317) dotnet/winforms
[4] Fixes PropertyGrid.ResetHelpForeColor resets the back color instead of the fore color ↗ dotnet/winforms
[5] Fix ObjectDisposedException in UnixProcessReaper during Ctrl+C shutdown ↗ dotnet/sdk
[6] Improve handling of null values in JSON properties mapped to primitive collections ↗ dotnet/efcore
[7] Fix CsrfProtectionMiddleware perf degradations ↗ dotnet/aspnetcore

Quick answers

What shipped in .NET on July 3, 2026?: The C# Editor & Experimental (EE) gets caught up with actual C# spec compliance, while ASP.NET Core fixes a hot-path performance regression introduced in recent CSRF middleware. In total, 24 commits and 23 pull requests landed.
Who contributed to .NET on July 3, 2026?: 6 developers shipped this update, including asundheimMSFT, jjonescz, ricardobossan, JeremyKuhne, AndriySvyryd, and DeagleGross.
What were the notable .NET updates?: [EE] Enable `using static` for non-static classes in CSharp EE, Unsafe evolution: avoid errors inside nameof, and Indeterminate and checked `ToolStripMenuItem` icons are now clearly visible in dark mode on `ContextMenuStrip`, `MenuStrip`, `StatusStrip` and `ToolStrip` drop-down buttons. (#14317).

WASM RUNTIME SHRINKS 3.6% AS DOTNET HARDENS DEBUGGER EXPORTS

The JIT compiler just cut 815 kilobytes from WebAssembly Core Library by folding address constants into load instructions, while the runtime fixed a silent failure in WASI debugging that would strip metadata from stripped binaries.

dotnet 13 shipped 1-min read

@dotnet 3 days ago

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 4 days 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

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SQLCLIENT KILLS PLATFORM-SPECIFIC BUILDS, ASPNETCORE HARDENS SIGNALR

SqlClient unified its Windows and Unix code paths without restructuring the NuGet package, collapsing build complexity across the entire SNI layer.

dotnet 97 shipped 2-min read

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