What’s New in .NET 9 Preview 6: Comprehensive Overview

On July 9th, 2024, Microsoft released .NET 9 Preview 6, featuring significant updates and enhancements across the framework. Key highlights include:

Runtime Updates:

• ARM64 Code Generation: Improved data loading/storing, enhancing execution time.
• Code Layout: Optimized basic block ordering for better performance.
• Loop Optimizations: Enhanced performance by flipping loop counter variables.
• Reduced Address Exposure: Better tracking of local variables for more optimizations.
• AVX10v1 Support: New SIMD instruction set for AVX10-enabled hardware. Hardware Intrinsic Code Generation: Improved handling of constants in hardware intrinsics.
• Constant Folding: Enhanced for floating-point and SIMD operations.

SDK Updates:

• NuGetAudit: Warnings for vulnerabilities in transitive dependencies.
• dotnet nuget why: Command to identify usage of transitive packages.
• MSBuild BuildChecks: Enforces rules during builds, similar to Roslyn Analyzers.

.NET MAUI Updates:

• Quality Improvements: Expanded test coverage and bug fixing for Android and iOS development.
• ASP.NET Core Updates:
• Fingerprinting of Static Web Assets: Improved caching and load times.
• Enhanced Distributed Tracing for SignalR: Better tracing capabilities.
• Microsoft.AspNetCore.OpenAPI Enhancements: Improved attribute support and schema transformers.
• New Analyzer for [Authorize] and [AllowAnonymous]: Warns when [Authorize] is overridden.

👀 Please visit What’s New in .NET 9 Preview 6: Comprehensive Overview - DevToys.io for an in-depth overview of these items! 🔥

C# 13 Updates:

• Partial Properties: Supports source generators, making APIs intuitive.
• Primary Constructors in Logging Source Generator: Logging using classes with primary constructors.
• System.Text.Json Updates:
• Respecting Nullable Annotations: Enforces nullability during serialization/deserialization.
• Requiring Non-Optional Constructor Parameters: Treats non-optional constructor parameters as required.
• Ordering JsonObject Properties: Enables explicit property order manipulation.
• Additional Contract Metadata APIs: Exposes constructor metadata and improved attribute support.

Libraries Updates:

• [GeneratedRegex] on Properties: Supports partial properties in C# 13.
• Regex.EnumerateSplits: Span-based input without allocation.
• OrderedDictionary: New generic collection.
• ReadOnlySet: For creating read-only views of sets.
• Span-Based APIs: New features for file operations and string manipulations.
• Base64Url: Methods for Base64Url encoding/decoding. SocketsHttpHandler by Default: Improved configurability in HttpClientFactory.
• TLS Resume with Client Certificates on Linux: Adds support for TLS resume on Linux.
• Metrics Gauge Instrument: Records non-additive values like background noise level.

👀 Please visit What’s New in .NET 9 Preview 6: Comprehensive Overview - DevToys.io for an in-depth overview of these items! 🔥