.NET 11 Preview 5: What's Actually New for C# and MAUI Developers | Community Feed

This write-up focuses on the changes that matter in day-to-day engineering, not just release notes headlines. It connects language features, SDK tooling, runtime behavior, and MAUI stability work into a practical migration outlook for .NET 11.

What you’ll learn

C# 15 additions called out in Preview 5, including union types, closed classes, and LINQ FullJoin support
SDK workflow updates like the built-in MCP server template and build-time package vulnerability checks
Runtime and framework improvements, including notable async performance gains and Blazor SSR validation updates
MAUI-specific reliability rollups and how they affect teams already shipping on .NET 10
A practical strategy for starting .NET 11 validation early to avoid migration pressure later in the release cycle