What is a polyfill-first approach in .NET?

It is a strategy that prioritizes using source generators like PolySharp to enable modern language syntax on older .NET versions before resorting to manual conditional compilation (#if) blocks.

Does this skill help with NuGet package validation?

Yes, it includes guidance on using EnablePackageValidation and ApiCompat tools to ensure your multi-targeted library maintains a consistent public API across all targets.

Can I use C# 13 features on .NET 8 using this skill?

Yes, this skill provides the configuration patterns to use PolySharp and Polyfill for backporting many language features like 'required' members and 'init' properties to older runtimes.

How does this skill handle runtime behavior differences?

For differences that cannot be polyfilled at compile time, the skill provides a decision flow for using TFM-based preprocessor symbols or the adapter pattern to isolate divergent code.

.NET Multi-Targeting & Polyfills

Name: .NET Multi-Targeting & Polyfills
Author: rudironsoni

byrudironsoni

0•

Herramientas para Desarrolladores

Guides developers through complex .NET multi-targeting scenarios using polyfills, source generators, and conditional compilation strategies.

Building cross-platform .NET libraries and applications often requires targeting multiple frameworks (TFMs), which can lead to fragmented and maintenance-heavy codebases. This skill provides a comprehensive framework for a 'polyfill-first' approach, utilizing tools like PolySharp and SimonCropp/Polyfill to bring modern C# syntax (like 'required' and 'init' members) and newer BCL APIs to older runtimes. It helps developers navigate the decision matrix between using compile-time stubs, runtime behavior isolation, or platform-specific API divergence, ensuring a maintainable and high-performance codebase across the entire .NET ecosystem.

Características Principales

010 GitHub stars

02Comprehensive decision matrix for selecting TFM-based strategies

03BCL API backporting via SimonCropp/Polyfill for missing runtime methods

04Advanced .csproj patterns for managing multi-TFM source files

05Polyfill-first strategy using PolySharp for compiler-synthesized stubs

06API compatibility validation using EnablePackageValidation and ApiCompat

Casos de Uso

01Backporting modern C# 11/12/13 syntax to .NET Standard 2.0 or older .NET Core versions

02Maintaining a single NuGet package that targets both legacy .NET Framework and modern .NET 8/9+

03Optimizing performance-critical paths using TFM-specific APIs like SearchValues or FrozenDictionary

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add rudironsoni/rulesync-dotnet dotnet-multi-targeting

For use in Claude.ai and ChatGPT

Características Principales

010 GitHub stars

02Comprehensive decision matrix for selecting TFM-based strategies

03BCL API backporting via SimonCropp/Polyfill for missing runtime methods

04Advanced .csproj patterns for managing multi-TFM source files

05Polyfill-first strategy using PolySharp for compiler-synthesized stubs

06API compatibility validation using EnablePackageValidation and ApiCompat

Casos de Uso

01Backporting modern C# 11/12/13 syntax to .NET Standard 2.0 or older .NET Core versions

02Maintaining a single NuGet package that targets both legacy .NET Framework and modern .NET 8/9+

03Optimizing performance-critical paths using TFM-specific APIs like SearchValues or FrozenDictionary