Exploring.NET 11: Key C#15, ASP.NET Core, MAUI, and SDK Enhancements

The.NET 11 release delivers C# 15 features to boost productivity and safety. Expect union types, union patterns, closed class hierarchies, and a redesigned unsafe keyword for improved memory safety. Collection expression arguments and extended layout support streamline code. ASP.NET Core now includes built-in OpenTelemetry tracing and Zstandard compression. Blazor adds server-side validation, TempData and session parameter binding, QuickGrid without interactivity, and server-initiated circuit pauses. New Web Worker and MCP Server project templates ship with the SDK, and HTTP/3 begins processing requests earlier. .NET MAUI gets CoreCLR by default on Android, iOS, and Mac Catalyst. C# expressions in XAML eliminate converters, and XAML source generation speeds builds. Map controls gain pin clustering and richer APIs, while new gesture recognizers and animation overloads improve UX. The.NET SDK, runtime, and libraries see smaller Linux/macOS installers, JSON Lines support, full outer joins in LINQ, and enhanced CLI commands for environment variables and crash recovery. This STS release focuses on unifying runtimes, reducing boilerplate, and enabling AI-ready safety.

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