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Add component release guidance and any maintained feature-validation fixtures for owner review. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 637615df-deba-4407-bf00-9a3bd4e569b5
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 637615df-deba-4407-bf00-9a3bd4e569b5
Add the component link alongside its matching release note. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 637615df-deba-4407-bf00-9a3bd4e569b5
Retain component-owned index link and pick up current main for push validation. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 637615df-deba-4407-bf00-9a3bd4e569b5
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 637615df-deba-4407-bf00-9a3bd4e569b5
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 637615df-deba-4407-bf00-9a3bd4e569b5
danroth27
marked this pull request as ready for review
September 27, 2026 17:38
danroth27
requested review from
BrennanConroy,
DeagleGross,
SamMonoRT,
Youssef1313,
davpetr,
halter73,
ilonatommy,
javiercn,
kotlarmilos and
rokonec
September 27, 2026 17:43
DeagleGross
reviewed
Sep 28, 2026
danroth27
commented
Sep 28, 2026
oroztocil
reviewed
Sep 30, 2026
oroztocil
reviewed
Sep 30, 2026
Co-authored-by: Ondřej Roztočil <roztocil@outlook.com>
Co-authored-by: Ondřej Roztočil <roztocil@outlook.com>
DeagleGross
approved these changes
Oct 5, 2026
oroztocil
approved these changes
Oct 5, 2026
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Copilot review overview
🟡 Changes recommended
The notes omit shipped migration changes and violate the required bug-fix format.
Review effort: Balanced
Findings: 5
Open (5)
What changed in this PR
Adds ASP.NET Core release notes for .NET 11 RC 2 and links them from the milestone index.
Changes:
- Documents upgrade guidance and bug fixes.
- Adds the ASP.NET Core index link.
| File | Description |
|---|---|
README.md |
Links the ASP.NET Core notes. |
aspnetcore.md |
Adds ASP.NET Core RC 2 notes. |
💡 Configure MCP servers for context-aware, tailored reviews. Learn more in the docs.
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| # ASP.NET Core in .NET 11 RC 2 - Release Notes | |||
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| RC 2 improves validation of C# union cases and fixes Blazor and server behavior. The most important upgrade work for earlier .NET 11 previews is described below. | |||
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| ## Breaking changes from .NET 10 | ||
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| - **Additional Razor runtime compilation overloads now warn.** The remaining `AddRazorRuntimeCompilation` overloads are marked obsolete, completing an obsoletion begun in .NET 10. Code that uses those overloads now reports a compiler diagnostic when rebuilt; the runtime behavior is unchanged ([dotnet/aspnetcore #68841](https://github.com/dotnet/aspnetcore/pull/68841)). |
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| ## Changes since the previous preview | ||
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| - **Validation message formatting:** `IValidationMessageFormatter`, introduced during .NET 11 previews, has been removed. Custom validation attributes should override the base `ValidationAttribute.FormatMessage(string format, string name)` method instead if they want to include custom arguments in the localized error message. The `Microsoft.Extensions.Validation` pipeline uses the new `FormatMessage` method since RC2. ([dotnet/aspnetcore #69116](https://github.com/dotnet/aspnetcore/pull/69116), [dotnet/runtime #132853](https://github.com/dotnet/runtime/pull/132853)). |
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| - **Validation message formatting:** `IValidationMessageFormatter`, introduced during .NET 11 previews, has been removed. Custom validation attributes should override the base `ValidationAttribute.FormatMessage(string format, string name)` method instead if they want to include custom arguments in the localized error message. The `Microsoft.Extensions.Validation` pipeline uses the new `FormatMessage` method since RC2. ([dotnet/aspnetcore #69116](https://github.com/dotnet/aspnetcore/pull/69116), [dotnet/runtime #132853](https://github.com/dotnet/runtime/pull/132853)). | ||
| - **`BasePath` namespace:** The Blazor `BasePath` component introduced in Preview 1 moved from `Microsoft.AspNetCore.Components.Endpoints` to `Microsoft.AspNetCore.Components`. Update explicit imports and fully qualified references when upgrading from RC 1 ([dotnet/aspnetcore #69143](https://github.com/dotnet/aspnetcore/pull/69143)). | ||
| - **Experimental device-bound sessions:** The server-side `Microsoft.AspNetCore.Authentication.DeviceBoundSessions` implementation described in the RC 1 notes has been removed from this build. Apps testing that experimental package cannot carry their RC 1 configuration forward; use an existing supported authentication scheme instead ([dotnet/aspnetcore #69479](https://github.com/dotnet/aspnetcore/pull/69479)). |
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| - **Validation:** The validation generator discovers C# union case types, and Blazor client-side validation better supports custom validation attributes ([dotnet/aspnetcore #68846](https://github.com/dotnet/aspnetcore/pull/68846), [dotnet/aspnetcore #69026](https://github.com/dotnet/aspnetcore/pull/69026)). | ||
| - **Blazor:** `Virtualize` with end anchoring now fills the viewport after its initial provider load ([dotnet/aspnetcore #69388](https://github.com/dotnet/aspnetcore/pull/69388)). | ||
| - **Kestrel:** HTTP/2 rejects newline characters in trailers and dynamic HPACK table entries ([dotnet/aspnetcore #69247](https://github.com/dotnet/aspnetcore/pull/69247)). |
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Draft ASP.NET Core release notes for .NET 11 RC 2, based on the exact pinned build described in base PR #10601. Please review the technical claims and refine the prose before marking ready for review.
This PR targets the shared RC 2 release-notes branch. The component owner is responsible for merging it into that branch after review; the base PR remains a draft until the milestone ships.