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Add aspnetcore.md for .NET 11 Preview 2#10270

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Add aspnetcore.md for .NET 11 Preview 2#10270
jamesmontemagno wants to merge 10 commits intodotnet11-preview2from
dotnet11-preview2-aspnetcore

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@jamesmontemagno jamesmontemagno commented Feb 17, 2026

ASP.NET Core Release Notes for .NET 11 Preview 2

Generation methodology

These release notes were generated using the repository release notes skill process:

  1. Collected all 50 merged PRs from dotnet/aspnetcore milestone 11.0-preview2
  2. Filtered to user-facing feature PRs (excluded infra, deps, backports, test-only, bug fixes)
  3. Enriched with full PR descriptions, linked issues, and reaction counts
  4. Categorized by impact tier and authored following format-template.md and editorial-rules.md
  5. Validated against installed Preview 2 build (SDK 11.0.100-preview.2.26122.107) by creating working code samples
  6. Reviewed against release notes guidance: removed bug fixes and internal implementation details, added code samples

Features documented

Feature Category Verified
Native OpenTelemetry tracing Observability Yes
TempData for Blazor Blazor Yes
OpenAPI 3.2.0 support API Yes (via branch)
Web Worker template Templates Yes
Passkey display name inference Identity No (requires Identity scaffolding)

Excluded per release notes guidance

Bug fixes (fixing bugs in existing functionality is assumed):

  • Passkey sign-in confirmation/lockout checks (#65024)
  • Label id attribute in interactive mode (#65263)
  • Dev cert compatibility with older SDKs (#65151)
  • SignalR HTTP/2 SkipNegotiation (#62940)
  • SignalR WebSocketFactory for browser environments (#65359)
  • Request smuggling mitigation (#65445)

Internal implementation details (no user-facing action):

  • Kestrel bad request handling optimization (#65256)
  • HTTP logging middleware allocation reduction (#65147)

Not in release branch:

  • Validation source gen indexer fix (#65432) - merged to main only

Code samples

Working samples committed to danroth27/AspNetCore11Samples@dotnet11p2

Community contributors

@baywet, @BekAllaev, @WeihanLi

danroth27 and others added 2 commits March 2, 2026 17:26
Testing against SDK 11.0.100-preview.2.26122.107 revealed:
- OpenAPI 3.2.0: Microsoft.OpenApi is still v2.0.0 (not 3.3.1), feature not in build
- Validation source gen indexer fix: JsonElement parameter still crashes with
  'Property this[] not found on type JsonElement'

Both features were milestoned to 11.0-preview2 but their PRs merged after the
build was produced. Removed from release notes to avoid documenting features
users cannot try.

Co-authored-by: Copilot <[email protected]>
Backport PR dotnet/aspnetcore#65476 was merged to release/11.0-preview2
with Servicing-approved label, confirming this feature will ship in the
final Preview 2 build.

Co-authored-by: Copilot <[email protected]>
@danroth27 danroth27 requested review from JamesNK and adaggarwal and removed request for JamesNK March 3, 2026 03:00
- Remove 8 bug fix and internal optimization sections per release notes
  guidance (bug fixes are assumed, release notes focus on new capabilities)
- Add tested code sample for Native OTEL tracing (AddSource pattern)
- Add code sample for OpenAPI 3.2.0 (OpenApiSpecVersion.OpenApi3_2)
- Remove orphaned text artifact
- Reorder community contributors alphabetically

Co-authored-by: Copilot <[email protected]>
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"Native OpenTelemetry tracing for ASP.NET Core" looks good.

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@ilonatommy ilonatommy left a comment

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".NET Web Worker project template" approved

@oroztocil oroztocil requested a review from dariatiurina March 3, 2026 11:09
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"TempData support for Blazor" looks good.

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Looks good! 👍

danroth27 and others added 3 commits March 3, 2026 09:40
Adds team-aspnetcore.md with ASP.NET Core-specific instructions:
- Use milestones (not area labels) for PR discovery
- Exclude bug fixes and internal implementation details
- Require why + how (code sample) for every feature
- No PR links (features often span multiple PRs); link issues instead
- Community contributors section lists ALL external contributors
- Release branch verification in dotnet/aspnetcore (not VMR)

Co-authored-by: Copilot <[email protected]>
- Remove all PR and issue links from ASP.NET Core release notes per
  team guidance (features often span multiple PRs)
- Update team-aspnetcore.md: PR links should not be used, issue links
  are optional and only when they add meaningful context

Co-authored-by: Copilot <[email protected]>
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6 participants