.NEXT (dotNext) is a set of powerful libraries designed for high-performance scenarios when your application expects near zero memory allocation and high flexibility. It is aimed to high-load microservices, database engines, actors, and various types of distributed applications. The feature list includes a rich set of efficient tools with low overhead:

• Buffer manipulations
• String building
• Monadic types
• Advanced GC notifications
• Low-level API to work with memory: alignment detection, type-safe unmanaged allocators, Span<T> manipulations
• Base64 streaming encoder/decoder
• Async-friendly SIEVE cache
• Async locks
• Extended LINQ Expression Trees and dynamic code generation tools with async lambdas for metaprogramming
• Raft Consensus Algorithm with extensions such as the failure detection
• Fast general-purpose Write Ahead Log
• TCP multiplexing protocol
• HyParView protocol implementation

All these things are implemented in 100% managed code on top of existing .NET API.

• Features
• API documentation
• Benchmarks
• NuGet Packages

Release Date: 07-26-2026

DotNext 6.5.0

• Improved performance of Atomic<T> type: multiple readers don't contend anymore
• Introduced write lock scope to Atomic<T> data type
• ReaderWriterSpinLock is deprecated in favor of Atomic<T> struct
• Fixed AOT compatibility for BoxedValue<T> and UserDataStorage types
• Removed lock contention when reading from UserDataStorage
• Improved performance of TypeMap and ConcurrentTypeMap types
• BufferWriterSlim<T> can be constructed with a fixed capacity

DotNext.Metaprogramming 6.5.0

• All methods accepting variadic arguments as params Expression[] args now changed to params IEnumerable<Expression> args
• AsDynamic() extension method is deprecated in favor of Quoted extension property and extension operators

DotNext.Unsafe 6.5.0

• Updated dependencies

DotNext.Threading 6.5.0

• Improved performance of AsyncStateTracker type
• Perf improvements: ManualResetCompletionSource internals moved to BoxedValue<T> type to avoid redundant type check

DotNext.IO 6.5.0

• Introduced Limit extension method for all classes implementing IBufferWriter<T> interface. The method returns the wrapper that limits the capacity of the underlying writer
• EndPointFormatter type is moved from DotNext.Net.Cluster library

DotNext.Net.Cluster 6.5.0

• EndPointFormatter type is moved to DotNext.IO library

DotNext.AspNetCore.Cluster 6.5.0

• Updated dependencies

DotNext.MaintenanceServices 1.5.0

• Updated dependencies

The libraries are versioned according to Semantic Versioning 2.0.

❌ - unsupported, ✅ - bug and security fixes only, ✔️ - active development

Philosophy of development process:

1. All libraries in .NEXT family are available for various .NET form factors: Mono, WASM, NativeAOT
2. Minimal set of dependencies
3. Provide high-quality documentation
4. Stay cross-platform
5. Provide benchmarks

.NEXT is used by several companies in their projects:

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the .NET Foundation Code of Conduct. For more information see the Code of Conduct FAQ or contact conduct@dotnetfoundation.org with any additional questions or comments.