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wire 2026-09-01
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$ the-wire · showcase

Dotnet sdk adds net12 framework references, F# cleans up old flags

By RepoJournal · Filed · About .NET

Tomas Grosup Rolf Bjarne Kvinge LeafShi1 marcpopMSFT cedrikewers tannergooding github-actions
9 people shipped this
Tomas Grosup @T-Gro 4 cited Rolf Bjarne Kvinge @rolfbjarne 2 cited LeafShi1 @LeafShi1 2 cited marcpopMSFT @marcpopMSFT 1 cited cedrikewers @cedrikewers 1 cited tannergooding @tannergooding 1 cited github-actions @github-actions DoctorKrolic @DoctorKrolic SimonZhao888 @SimonZhao888

The dotnet sdk has added the net12 known framework references, preparing for the next major framework release.

The net12 release prep took shape: the sdk now ships the complete live `net12.0` known framework and runtime-pack metadata set, freezes `net11.0` package and runtime versions at the preview 7 build, and locks down RID inheritance boundaries so future runtime flows won't disturb net11 metadata [1]. If you pack .nuspec files directly, `dotnet pack --no-default-excludes` and `-p:NoDefaultExcludes=true` now work, where previously files and folders starting with a dot and files ending in .nupkg were always dropped with NU5119 with no way to opt out [2]. The SDK analyzer set gains CA1878, which recommends replacing private static readonly constant-array fields with `ReadOnlySpan<T>` properties to avoid managed array allocations [3]. In F#, several always-on language feature flags were removed, including `DelegateTypeNameResolutionFix`, `LowercaseDUWhenRequireQualifiedAccess`, `PreferStringGetPinnableReference`, and `EscapeDotnetFormattableStrings`, since the minimum `--langversion` is 8.0 and these can never be off [4][5][6][7]. WinForms shipped DataGridView dark mode theming behind the `System.Windows.Forms.DataGridViewDarkModeTheming` AppContext switch, enabled by default for .NET 10 [8][9]. Mac Catalyst is now treated as a desktop platform for deciding macOS test runs, so those tests aren't skipped when a branch enables only Mac Catalyst [10]. A xharness change caps test output in the HTML report for asserts that dump a lot of text [11].

Action items

References

  1. [1] Add net12 known framework references ↗ dotnet/sdk
  2. [2] Add `dotnet pack --no-default-excludes` ↗ dotnet/sdk
  3. [3] Add CA1878 to prefer ReadOnlySpan properties over readonly array fields ↗ dotnet/sdk
  4. [4] Remove always-on language feature flag DelegateTypeNameResolutionFix (#20366) ↗ dotnet/fsharp
  5. [5] Remove always-on language feature flag LowercaseDUWhenRequireQualifiedAccess (#20170) (#20365) ↗ dotnet/fsharp
  6. [6] Remove always-on language feature flag PreferStringGetPinnableReference (#20186) (#20370) ↗ dotnet/fsharp
  7. [7] Remove always-on language feature flag EscapeDotnetFormattableStrings (#20181) (#20375) ↗ dotnet/fsharp
  8. [8] Enable DataGridView dark mode theming via AppContext switch ↗ dotnet/winforms
  9. [9] Enable DataGridView dark mode theming via AppContext switch (#14267) ↗ dotnet/winforms
  10. [10] [devops] Run macOS tests for Mac Catalyst-only builds ↗ dotnet/macios
  11. [11] [xharness] Cap test output into the html report. ↗ dotnet/macios

$ ls dotnet/reviews/ # the step-back reads

the week in review Native AOT debug info overhaul the month in review F# interpolated strings and record spreads land as Orleans and runtime harden
Topics: .NET Full archive →

Quick answers

What shipped in .NET on September 1, 2026?
The dotnet sdk has added the net12 known framework references, preparing for the next major framework release. In total, 34 commits and 31 pull requests landed.
Who contributed to .NET on September 1, 2026?
9 developers shipped this update, including Rolf Bjarne Kvinge, marcpopMSFT, cedrikewers, tannergooding, github-actions, DoctorKrolic, Tomas Grosup, and LeafShi1, and 1 more.
What were the notable .NET updates?
Add net12 known framework references, Add `dotnet pack --no-default-excludes`, and Add CA1878 to prefer ReadOnlySpan properties over readonly array fields.
♥

$ log @dotnet --recent

Spark 4.0 daemon workers and RDD execution land 19 shipped Orleans hardens grain directory and storage providers against null inputs 50 shipped WebAssembly runtime fixes narrow long-local reads; F# strips dead feature flags 97 shipped macOS signal handling crash fix, On-Demand Resources for simulator 123 shipped

$ log --all # elsewhere on the wire

Meta React Native adds Stable API guards to renderer attributed string FastAPI & Pydantic Pydantic fixes Mypy plugin crash, tightens datetime constraints

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Rails Django Laravel Node.js Go Vercel Vue.js Kubernetes HashiCorp Arch Linux Linux Anthropic

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