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# PostSharp 2026.0 Generally Available: Support for .NET 10, C# 14 and Extension Blocks

> PostSharp 2026.0 is now generally available. It includes support for .NET 10, C# 14, and the new extension blocks syntax. The minimum supported frameworks have also been updated.

Published: 2026-01-07 · Author: Gaël Fraiteur · Canonical: https://postsharp.net/blog/postsharp-2026-0-ga

Alongside [Metalama 2026.0](https://postsharp.net/blog/metalama-2026-0-ga), we're announcing the general availability of PostSharp 2026.0. This release brings full support for .NET 10 and C# 14, including proper handling of the new extension blocks syntax introduced in C# 14.

## .NET 10 and C# 14

We've updated and tested PostSharp to fully support the .NET 10 SDK and C# 14 across all packages. You can now confidently use PostSharp with the latest .NET stack.

## Extension Blocks Support

C# 14 introduces extension blocks as an alternative syntax for defining extension methods. This new language feature required careful consideration in PostSharp to ensure predictable behavior.

By default, multicast attributes now skip extension block members. This prevents aspects from being unintentionally applied to compiler-generated metadata associated with extension blocks.

For scenarios where you do want to target extension block members, we've added the `AllowExtensionBlockMembers` property to both `MulticastAttribute` and `MulticastAttributeUsageAttribute`. Setting this property to `true` enables your aspects to target extension block members explicitly.

Additionally, developers using `IAspectProvider` or `IAdviceProvider` interfaces can use the new `ReflectionHelper.IsExtensionBlockMetadata` utility method to identify compiler-generated metadata associated with extension blocks.

## Updated Framework Baselines

We've raised the minimum supported frameworks to reflect the current .NET ecosystem:

* **.NET Standard 2.0** (minimum)
* **.NET Framework 4.7.0** (minimum)
* **.NET 6.0** (minimum for .NET Core-based projects)

All pre-2017 target frameworks and obsolete .NET Core versions that have lost mainstream support have been removed. Please consult the [breaking changes documentation](https://doc.postsharp.net/introduction/whatsnew/whats-new-20260) for complete migration guidance.

## Conclusion

PostSharp 2026.0 continues our commitment to keeping PostSharp compatible with the latest .NET releases. While our new feature development is focused on [Metalama](https://postsharp.net/blog/metalama-2026-0-ga), we remain dedicated to ensuring that PostSharp users can stay current with the evolving .NET platform.

Happy meta-programming with PostSharp!

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