Update What's new in .NET 11 for Preview 3#53004
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BillWagner merged 4 commits intomainfrom Apr 14, 2026
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- Updated all 4 What's new articles for .NET 11 to Preview 3 - Updated ms.date to 04/14/2026 in all files - runtime.md: simplified Runtime Async opt-in (no EnablePreviewFeatures needed), added NativeAOT/R2R support, added JIT switch folding and uint-float cast improvements, added WebAssembly section - libraries.md: added System.Text.Json naming/ignore enhancements, Zstandard in System.IO.Compression, ZIP CRC32 validation, SafeFileHandle pipe support, RandomAccess pipe support, Regex AnyNewLine option - sdk.md: added solution filter CLI support, file-based app #:include, dotnet run -e, dotnet watch improvements, other CLI improvements - overview.md: updated summaries to reflect Preview 3 features, added union types to C# 15 list - Updated Libraries.cs snippet with new code samples for Preview 3 features - Updated Runtime.cs snippet to remove EnablePreviewFeatures comment Agent-Logs-Url: https://github.com/dotnet/docs/sessions/b44af3f0-172c-4e4f-bb38-d79eed5ce99c Co-authored-by: BillWagner <493969+BillWagner@users.noreply.github.com>
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[WIP] Update What's new articles for .NET 11 Preview 3
Update What's new in .NET 11 for Preview 3
Apr 14, 2026
BillWagner
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Apr 14, 2026
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This is ready.
The snippets issues is because preview 3 docker images aren't available yet.
We should verify the build before merging.
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Pull request overview
Updates the .NET 11 “What’s new” content set to reflect Preview 3 (dated 04/14/2026), including new runtime, libraries, and SDK additions, plus refreshed snippets that demonstrate new APIs and behaviors.
Changes:
- Refreshes all four .NET 11 “What’s new” articles to Preview 3 (including updated
ms.dateand “last updated” text). - Adds new Preview 3 content across runtime (Runtime Async opt-in change, JIT items, WebAssembly section), libraries (Json naming/ignore defaults, ZIP CRC32 validation, low-level I/O, regex), and SDK tooling (solution filters,
#:include,dotnet run -e, watch improvements). - Updates/extends snippets to cover the new library features and removes the runtime-async preview opt-in property from the snippet comment.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| docs/core/whats-new/dotnet-11/snippets/csharp/Runtime.cs | Removes the <EnablePreviewFeatures> line from the runtime-async opt-in snippet comment. |
| docs/core/whats-new/dotnet-11/snippets/csharp/Libraries.cs | Adds new snippet regions for Json naming/ignore, SafeFileHandle pipe APIs, and RegexOptions.AnyNewLine, plus a new EventData model. |
| docs/core/whats-new/dotnet-11/sdk.md | Updates Preview 3 messaging and adds new CLI/tooling sections and examples. |
| docs/core/whats-new/dotnet-11/runtime.md | Updates Preview 3 messaging and adds Runtime Async clarifications, new JIT bullets, and a new WebAssembly section. |
| docs/core/whats-new/dotnet-11/overview.md | Updates the summary bullets to include Preview 3 runtime/libraries/SDK additions and adds a C# 15 “Union types” link. |
| docs/core/whats-new/dotnet-11/libraries.md | Updates Preview 3 messaging and adds new sections for ZIP CRC32 validation, Json naming/ignore defaults, low-level I/O, and regex improvements. |
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
adegeo
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Approved to unblock. Does it just need the preview 3 packages fully published?
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@BillWagner Verified that .NET 11 Preview 3 is installed for the snippets testing, so that isn't the source of failure. |
It should be `asyncRead` and `asyncWrite`, not `asyncReads` and `asyncWrites`.
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Updates all four .NET 11 "What's new" articles to cover Preview 3 (released April 14, 2026). All
ms.datefields updated to04/14/2026.Runtime (
runtime.md)net11.0projects no longer need<EnablePreviewFeatures>true</EnablePreviewFeatures>— only<Features>runtime-async=on</Features>required. Added NativeAOT/ReadyToRun support and continuation object reuse optimization.uint→float/doublecasts on pre-AVX-512 x86; extended bounds-check elimination to cover index-from-end access.float[]/Span<float>JS marshaling.Libraries (
libraries.md)JsonNamingPolicy.PascalCase, per-member[JsonNamingPolicy]attribute, and type-level[JsonIgnore(Condition = ...)].System.IO.Compression(package reference removal noted).InvalidDataExceptionon corrupt entries.SafeFileHandle.Type,SafeFileHandle.CreateAnonymousPipe,RandomAccessread/write on non-seekable handles (pipes).RegexOptions.AnyNewLinetreats all Unicode newline sequences (\r\n,\u0085,\u2028,\u2029) as line terminators.SDK (
sdk.md)dotnet slncan create/edit solution filters (.slnf).#:includefor splitting across files.dotnet run -e KEY=VALUEpasses environment variables without shell state changes.dotnet watch: Aspire app-host integration, automatic crash recovery, improved Ctrl+C on Windows desktop apps.dotnet format --framework,dotnet test --artifacts-path(MTP), anddotnet tool execapproval prompt removal.Overview (
overview.md)Snippets
Libraries.cs: addedJsonNamingIgnore,SafeFileHandlePipe, andRegexAnyNewLinesnippet regions; addedEventDatamodel with new attributes.Runtime.cs: removed<EnablePreviewFeatures>from the opt-in comment block.Internal previews