.NET 11 Preview Emphasizes Core Engineering Over AI
Microsoft's .NET 11 preview cycle (expected November 2026) is focusing squarely on nuts-and-bolts engineering rather than AI hype. The early previews highlight core runtime, SDK, web framework, and language improvements.
Key .NET 11 Preview 1-3 Highlights:
- C# 15 Union Types — Represent values that can be one of several case types with exhaustive switch checking, making code more expressive and type-safe
- Runtime Async — Now enabled by default in Preview 3 (no EnablePreviewFeatures flag needed), lowering friction for experimentation
- Performance — Continued JIT optimizations, bounds-check elimination, and other low-level runtime improvements
- ASP.NET Core — Native OpenTelemetry tracing attributes, Zstandard response compression and request decompression, TempData support for Blazor static SSR
- CLI Improvements —
dotnet run -efor inline environment variables, solution filter CLI support,dotnet watchimprovements for Aspire app hosts
Azure SDK April 2026 Release
The April 2026 Azure SDK release includes notable security and AI improvements:
- Azure.AI.Projects 2.0 — Major stable release with significant architectural changes for Azure AI Foundry integration workflows
- Cosmos DB 4.79.0 — Critical Java deserialization RCE vulnerability fix (CWE-502), N-Region synchronous commit support, Query Advisor feature, and BM25 statistics control for hybrid search
- New Provisioning Libraries — Network 1.0.0 and Private DNS 1.0.0 (stable GA), plus beta 1.0.0 releases for API Management, Batch, Compute, Monitor, MySQL, and Security Center
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