.NET 11 Preview 5 stuff#54352
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Pull request overview
Updates the C# 15 and .NET 11 “what’s new” documentation and snippets to align with .NET 11 Preview 5, including union runtime support details, updated union pattern-matching guidance, and expanded libraries feature coverage with new examples.
Changes:
- Updates union documentation to reflect Preview 5 runtime availability of
UnionAttribute/IUnionand refines union pattern-matching behavior (includingnotpattern behavior). - Enables and documents union member provider examples in the unions snippet set.
- Expands .NET 11 “what’s new” libraries content and snippets (for example, LINQ join improvements,
SerializeAsyncEnumerableenhancements,X25519DiffieHellman,EqualityComparer<T>.Create, and genericRandomAPIs).
Reviewed changes
Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
| docs/csharp/whats-new/csharp-15.md | Updates C# 15 union feature notes for .NET 11 Preview 5. |
| docs/csharp/language-reference/operators/patterns.md | Updates union-pattern matching description and exceptions, and fixes anchor link. |
| docs/csharp/language-reference/compiler-messages/union-declaration-errors.md | Updates union pattern-matching link anchor. |
| docs/csharp/language-reference/builtin-types/union.md | Revises union docs for Preview 5, expands pattern matching explanation, and updates union implementation section. |
| docs/csharp/language-reference/builtin-types/snippets/unions/RuntimePolyfill.cs | Removes runtime polyfill snippet (now described as included in runtime). |
| docs/csharp/language-reference/builtin-types/snippets/unions/Program.cs | Runs the member-provider scenario in the unions snippets entry point. |
| docs/csharp/language-reference/builtin-types/snippets/unions/MemberProvider.cs | Enables the member-provider sample code and scenario. |
| docs/csharp/language-reference/builtin-types/snippets/unions/BodyMembers.cs | Replaces the body-members sample with a Length union example. |
| docs/core/whats-new/dotnet-11/snippets/csharp/Runtime.cs | Wraps runtime snippet into a callable example method. |
| docs/core/whats-new/dotnet-11/snippets/csharp/Program.cs | Adds an entry point to run a libraries example. |
| docs/core/whats-new/dotnet-11/snippets/csharp/Libraries.cs | Adds new libraries examples (LINQ joins, JSON pipe writer streaming, crypto, etc.). |
| docs/core/whats-new/dotnet-11/sdk.md | Updates “last updated for Preview 5” and ms.date. |
| docs/core/whats-new/dotnet-11/runtime.md | Updates “last updated for Preview 5” and ms.date. |
| docs/core/whats-new/dotnet-11/overview.md | Updates “last updated” and expands the libraries bullet list. |
| docs/core/whats-new/dotnet-11/libraries.md | Adds/expands libraries feature sections and code references for Preview 5. |
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
BillWagner
approved these changes
Jun 11, 2026
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This all LGTM @gewarren
Let's 
Member
|
Note OPS warnings before merging. I think they'll all be addressed by dotnet/dotnet-api-docs#12732 This one should probably be merged rather than squashed, right @gewarren ? |
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