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[release-notes] MSBuild in .NET 11 Preview 6#10463

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[release-notes] MSBuild in .NET 11 Preview 6#10463
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Draft MSBuild release notes for .NET 11 Preview 6. This PR targets the milestone base branch release-notes/11.0-preview6 (see #10455).

Please review the AI-authored content for accuracy, including any code samples and <!-- TODO --> / <!-- Filtered features --> notes, then mark ready for review. 🤖 Generated with the release-notes skill.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
baronfel and others added 2 commits July 10, 2026 12:59
…shake (dotnet/msbuild#13890)

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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@baronfel
baronfel marked this pull request as ready for review July 10, 2026 18:03
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baronfel requested review from leecow and rbhanda as code owners July 10, 2026 18:03
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Markdown validation is the other pages that are not yet merged. Merging this one.

@baronfel
baronfel merged commit 1050b00 into release-notes/11.0-preview6 Jul 10, 2026
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@baronfel
baronfel deleted the release-notes/11.0-preview6-msbuild branch July 10, 2026 18:23
rbhanda added a commit that referenced this pull request Jul 14, 2026
* [release-notes] .NET 11 Preview 6 base metadata

changes.json, features.json, build-metadata.json, and README for the
.NET 11 Preview 6 milestone (VMR base v11.0.0-preview.5.26302.115 ->
head release/11.0.1xx-preview6).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* [release-notes] C# in .NET 11 Preview 6 (#10460)

* [release-notes] C# in .NET 11 Preview 6

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update release-notes/11.0/preview/preview6/csharp.md

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Bill Wagner <wiwagn@microsoft.com>

* [release-notes] MSBuild in .NET 11 Preview 6 (#10463)

* [release-notes] MSBuild in .NET 11 Preview 6

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add bug-fix note for architecture-agnostic Runtime=NET task host handshake (dotnet/msbuild#13890)

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Remove HTML comments from Preview 6 MSBuild release notes

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Chet Husk <chusk3@gmail.com>

* [release-notes] NuGet in .NET 11 Preview 6 (#10464)

* [release-notes] NuGet in .NET 11 Preview 6

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix STJ feature-flag env var value and remove VS reference

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Chet Husk <chusk3@gmail.com>

* [release-notes] .NET SDK in .NET 11 Preview 6 (#10459)

* [release-notes] .NET SDK in .NET 11 Preview 6

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Clarify NativeAOT CLI updates in preview6/sdk.md

Updated the NativeAOT CLI section to clarify the unification of managed and NativeAOT parsers, and removed filtered content related to internal changes.

* Add live running-tests display to dotnet test notes

Document the in-flight test progress panel (dotnet/sdk#54486) and fix
pre-existing trailing-space lint errors in the NativeAOT section.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Chet Husk <baronfel@users.noreply.github.com>
Co-authored-by: Chet Husk <chusk3@gmail.com>

* [release-notes] Windows Forms in .NET 11 Preview 6 (#10465)

* [release-notes] Windows Forms in .NET 11 Preview 6

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Revise Windows Forms release notes for Preview 6

Updated release notes for .NET 11 Preview 6 to include bug fixes and improvements for various Windows Forms components.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Klaus Löffelmann <9663150+KlausLoeffelmann@users.noreply.github.com>

* [release-notes] .NET MAUI in .NET 11 Preview 6 (#10467)

* [release-notes] .NET MAUI in .NET 11 Preview 6

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Draft .NET MAUI and friends notes for .NET 11 Preview 6

Combined highlights for .NET MAUI, .NET for Android, and .NET for iOS,
Mac Catalyst, macOS, and tvOS: CollectionView2 on Windows, handler-based
Shell on Android, Compatibility package removal, AOT-safe HybridWebView,
Geolocation minimum-distance filter, a reliability wave, the
AndroidMessageHandler HTTP-contract work, and the Apple platform toolchain
and NSUrlSessionHandler updates.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Add Preview 6 items from MAUI maintainer review

Incorporates jfversluis review feedback on #10467:
- Android MediaPicker result recovery APIs (dotnet/maui#35455)
- HybridWebView Android message-source filtering (dotnet/maui#35717)
- XAML C# expression source generator CS1061 fix (dotnet/maui#35922)
- Testable permissions via IPermissions/Permissions.Current (dotnet/maui#35987)
- XA0149 warning for legacy __AndroidEnvironment__ resources (dotnet/android#11700)
- Skip library proguard.txt with disallowed R8 global options (dotnet/android#11709)

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: David Ortinau <david.ortinau@microsoft.com>

* [release-notes] EF Core in .NET 11 Preview 6 (#10462)

Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

* [release-notes] F# in .NET 11 Preview 6 (#10461)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* [release-notes] Containers in .NET 11 Preview 6 (#10468)

* [release-notes] Containers in .NET 11 Preview 6

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update release notes

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Logan Bussell <loganbussell@microsoft.com>

* [release-notes] .NET Libraries in .NET 11 Preview 6 (#10457)

* [release-notes] .NET Libraries in .NET 11 Preview 6

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix async DataAnnotations sample after testing on the Preview 6 SDK

AsyncValidationAttribute is overridden via the protected IsValidAsync
(and IsValid) members, not GetValidationResultAsync (which is the public
method the framework calls and is not virtual). Verified the corrected
sample compiles and runs against the Preview 6 build.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Verify Preview 6 library samples and fix inaccuracies

- Stream adapters: read from the read-only stream via StreamContent/PostAsync instead of copying HttpContent into it

- Cross-lane vectors: replace nonexistent Concat with ConcatLowerLower/LowerUpper/UpperLower/UpperUpper and drop preexisting Shuffle/ShuffleNative

- Async validation: swap the unique-username example for a VAT registry lookup, layer StringLength and RegularExpression sync rules with the async rule, and add a server-side validation note

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Jeff Handley <jeffhandley@users.noreply.github.com>

* [release-notes] ASP.NET Core in .NET 11 Preview 6 (#10456)

* [release-notes] WPF in .NET 11 Preview 6 (#10466)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Throw InvalidOperationException for sync validation of async validator

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Apply late review suggestions from #10456 to the ASP.NET Core notes

- OpenAPI unions: correct the third-party generator claim (ApiExplorer does not
  detect unions via JsonTypeInfoKind.Union; Swashbuckle/NSwag don't yet
  recognize unions). Per @DeagleGross review on #10456.
- Blazor Virtualize: note that a user scroll during ScrollToIndexAsync wins.
  Per @ilonatommy review on #10456.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add P6 Blazor items to align with docs (dotnet/AspNetCore.Docs#37322)

- CSRF: note that Blazor Web App templates no longer call app.UseAntiforgery().
- Bug fixes/Blazor: Virtualize is now CSP-compliant (#66680); session cookie is
  issued before streaming SSR for [SupplyParameterFromSession]/TempData (#66832).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Document 'Configure Blazor client behavior from the server' as a P6 feature

WithBrowserOptions flows client-side Blazor.start configuration from the server
in C# (log level, Server reconnection, SSR DOM preservation, WASM environment),
serialized to the client across Server/WebAssembly/Auto render modes. Introduced
in Preview 4 (server-to-browser config via DOM comment) and reshaped in Preview 6
(dotnet/aspnetcore#67337, proposal #66393). Includes the reshape/rename migration
for earlier adopters. Sample build-verified on 11.0.100-preview.6.26359.118.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Correct Virtualize CSP note: data-blazor-virtualize-reserved-height

Reviewing dotnet/AspNetCore.Docs#37322 surfaced that the attribute is
data-blazor-virtualize-reserved-height (only the server-computed spacer height),
not the generic data-blazor-style. Verified in the P6 source (Virtualize.cs /
Virtualize.ts). @ilonatommy corrected the same wording on the docs PR.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* [release-notes] .NET Runtime in .NET 11 Preview 6 (#10458)

* [release-notes] .NET Runtime in .NET 11 Preview 6

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Enrich Preview 6 runtime notes with additional verified features

Fold verified .NET 11 Preview 6 runtime changes into runtime.md
(JIT improvements, in-process crash logging, NativeAOT interface
dispatch, SIMD lane APIs, and an expanded bug-fix list), and rebuild
the TOC to match the current sections.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: ade796bb-8052-4946-b204-a88518267e77

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Rich Lander <2608468+richlander@users.noreply.github.com>

* fix markdown lint in preview6 containers note

Co-authored-by: jongalloway <68539+jongalloway@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Bill Wagner <wiwagn@microsoft.com>
Co-authored-by: Chet Husk <chusk3@gmail.com>
Co-authored-by: Chet Husk <baronfel@users.noreply.github.com>
Co-authored-by: Klaus Löffelmann <9663150+KlausLoeffelmann@users.noreply.github.com>
Co-authored-by: David Ortinau <david.ortinau@microsoft.com>
Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>
Co-authored-by: Logan Bussell <loganbussell@microsoft.com>
Co-authored-by: Jeff Handley <jeffhandley@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Rich Lander <2608468+richlander@users.noreply.github.com>
Co-authored-by: Rahul Bhandari <rbhanda@microsoft.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jongalloway <68539+jongalloway@users.noreply.github.com>
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