polishchuk 0 133 12.11.2024
Microsoft Releases .NET 9
Categories:
Microsoft
Technologies
.NET 9 introduces a range of features and improvements aimed at enhancing performance, security, and developer productivity. Key updates include:
Runtime Enhancements:
- Feature Switches with Trimming Support: New attributes enable defining feature switches, allowing unused code to be excluded during trimming, optimizing application size and performance.
- Dynamic Garbage Collection: The garbage collector now adapts dynamically to application sizes, improving memory management efficiency.
Library Updates:
- System.Text.Json:
- Support for nullable reference type annotations.
- Ability to export JSON schemas from types.
- Options to customize JSON indentation and read multiple root-level JSON values from a single stream.
- LINQ Enhancements: Introduction of
CountBy
andAggregateBy
methods for aggregating state by key without allocating intermediate groupings. - Cryptography:
- New one-shot hash method on
CryptographicOperations
. - Introduction of classes utilizing the KMAC algorithm.
- New one-shot hash method on
- Reflection: Addition of
PersistedAssemblyBuilder
for saving emitted assemblies, including support for emitting symbol information for debugging. - TimeSpan Enhancements: New
From*
methods allow the creation ofTimeSpan
objects from integers, reducing errors from floating-point imprecision.
SDK and Tooling Improvements:
- Workload Sets: Ensures workloads remain at a specific version until explicitly updated, providing greater control over development environments.
- Tool Roll-Forward Option: Users can now decide if .NET tools should run on newer runtime versions, enhancing flexibility.
- Unit Testing Enhancements: Improved MSBuild integration allows running tests in parallel, optimizing testing workflows.
- NuGet Security Audits: By default, audits now include both direct and transitive package references, bolstering security.
- Terminal Logger: Enabled by default with usability improvements, including summarized counts of failures and warnings at the end of builds.
- MSBuild Script Analyzers ("BuildChecks"): New analyzers help detect defects and regressions in build scripts.
- Analyzer Mismatch Detection: The SDK can detect and adjust for version mismatches between the .NET SDK and MSBuild, preventing potential issues.
Language Updates:
- C# 13:
- Introduction of
params
collections. - New lock type and semantics.
- Enhanced method group natural type inference.
- Implicit indexer access in object initializers.
- Support for
ref
locals and unsafe contexts in iterators and async methods. - Allowing
ref struct
types to implement interfaces and as arguments for type parameters in generics. - Partial properties and indexers in partial types.
- Overload resolution priority attribute for better overload selection.
- Introduction of
- F# 9:
- Support for nullable reference types.
- New discriminated union
.Is*
properties. - Enhancements to active patterns and computation expressions.
- Various productivity, performance, and tooling improvements.
Framework and Tooling Updates:
- ML.NET 4.0: Adds support for additional tokenizers, including Tiktoken, and models like Llama and CodeGen, enhancing machine learning capabilities.
- .NET Aspire:
ASP.NET Core:
- .NET MAUI: Focuses on product quality enhancements and introduces new features for cross-platform app development.
- Entity Framework Core: Updates include significant enhancements to the Azure Cosmos DB provider, steps towards AOT compilation, and pre-compiled queries.
- Windows Presentation Foundation (WPF): Adds support for Windows 11 theming and hyphen-based ligatures, improving desktop application aesthetics.
These updates in .NET 9 aim to provide developers with more robust, efficient, and secure tools for modern application development.
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