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 Polyfill 10.10.0 

dotnet add package Polyfill --version 10.10.0
 
 
NuGet\Install-Package Polyfill -Version 10.10.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Polyfill" Version="10.10.0">
 <PrivateAssets>all</PrivateAssets>
 <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
</PackageReference>
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Polyfill" Version="10.10.0" />
 


 Directory.Packages.props
 

 

 
<PackageReference Include="Polyfill">
 <PrivateAssets>all</PrivateAssets>
 <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
</PackageReference>
 


 Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Polyfill --version 10.10.0
The NuGet Team does not provide support for this client. Please contact its maintainers for support. 
#r "nuget: Polyfill, 10.10.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Polyfill@10.10.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Polyfill&version=10.10.0
 


 Install as a Cake Addin
 

 

 
#tool nuget:?package=Polyfill&version=10.10.0
 


 Install as a Cake Tool
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Polyfill

Source only package that exposes newer .NET and C# features to older runtimes.

The package targets netstandard2.0 and is designed to support the following runtimes.

  • net461, net462, net47, net471, net472, net48, net481
  • netcoreapp2.0, netcoreapp2.1, netcoreapp3.0, netcoreapp3.1
  • net5.0, net6.0, net7.0, net8.0, net9.0, net10.0, net11.0
  • uap10

Usage

After installing the NuGet package, polyfilled types and extension methods are available automatically. No extra using statements are needed beyond what the newer API requires.

<Project Sdk="Microsoft.NET.Sdk">
 <PropertyGroup>
 <LangVersion>latest</LangVersion>
 </PropertyGroup>
 <ItemGroup>
 <PackageReference Include="Polyfill" Version="*" PrivateAssets="all" />
 </ItemGroup>
</Project>

Key Features

  • Source only — compiles directly into the consuming project, no runtime dependency.
  • 881 polyfilled APIs across attributes, extension methods, and static helpers.
  • Conditional compilation — only the APIs missing from the target framework are included.
  • Optional feature groups — Ensure, Guard, Nullability, ArgumentExceptions, StringInterpolation.

Documentation

See the full documentation on GitHub for the complete API list, configuration options, and troubleshooting.

A compiled library variant is also available: PolyfillLib

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👁 JetBrains logo.

Product Versions Compatible and additional computed target framework versions.
.NET net5.0 net5.0 is compatible.  net5.0-windows net5.0-windows was computed.  net6.0 net6.0 is compatible.  net6.0-android net6.0-android was computed.  net6.0-ios net6.0-ios was computed.  net6.0-maccatalyst net6.0-maccatalyst was computed.  net6.0-macos net6.0-macos was computed.  net6.0-tvos net6.0-tvos was computed.  net6.0-windows net6.0-windows was computed.  net7.0 net7.0 is compatible.  net7.0-android net7.0-android was computed.  net7.0-ios net7.0-ios was computed.  net7.0-maccatalyst net7.0-maccatalyst was computed.  net7.0-macos net7.0-macos was computed.  net7.0-tvos net7.0-tvos was computed.  net7.0-windows net7.0-windows was computed.  net8.0 net8.0 is compatible.  net8.0-android net8.0-android was computed.  net8.0-browser net8.0-browser was computed.  net8.0-ios net8.0-ios was computed.  net8.0-maccatalyst net8.0-maccatalyst was computed.  net8.0-macos net8.0-macos was computed.  net8.0-tvos net8.0-tvos was computed.  net8.0-windows net8.0-windows was computed.  net9.0 net9.0 is compatible.  net9.0-android net9.0-android was computed.  net9.0-browser net9.0-browser was computed.  net9.0-ios net9.0-ios was computed.  net9.0-maccatalyst net9.0-maccatalyst was computed.  net9.0-macos net9.0-macos was computed.  net9.0-tvos net9.0-tvos was computed.  net9.0-windows net9.0-windows was computed.  net10.0 net10.0 is compatible.  net10.0-android net10.0-android was computed.  net10.0-browser net10.0-browser was computed.  net10.0-ios net10.0-ios was computed.  net10.0-maccatalyst net10.0-maccatalyst was computed.  net10.0-macos net10.0-macos was computed.  net10.0-tvos net10.0-tvos was computed.  net10.0-windows net10.0-windows was computed.  net11.0 net11.0 is compatible. 
.NET Core netcoreapp2.0 netcoreapp2.0 is compatible.  netcoreapp2.1 netcoreapp2.1 is compatible.  netcoreapp2.2 netcoreapp2.2 is compatible.  netcoreapp3.0 netcoreapp3.0 is compatible.  netcoreapp3.1 netcoreapp3.1 is compatible. 
.NET Standard netstandard2.0 netstandard2.0 is compatible.  netstandard2.1 netstandard2.1 is compatible. 
.NET Framework net461 net461 is compatible.  net462 net462 is compatible.  net463 net463 was computed.  net47 net47 is compatible.  net471 net471 is compatible.  net472 net472 is compatible.  net48 net48 is compatible.  net481 net481 is compatible. 
MonoAndroid monoandroid monoandroid was computed. 
MonoMac monomac monomac was computed. 
MonoTouch monotouch monotouch was computed. 
Tizen tizen40 tizen40 was computed.  tizen60 tizen60 was computed. 
Universal Windows Platform uap uap was computed.  uap10.0 uap10.0 is compatible. 
Xamarin.iOS xamarinios xamarinios was computed. 
Xamarin.Mac xamarinmac xamarinmac was computed. 
Xamarin.TVOS xamarintvos xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

This package has no dependencies.

NuGet packages (51)

Showing the top 5 NuGet packages that depend on Polyfill:

Package Downloads
vies-dotnet-api

European VIES VAT validation for dotnet.
ktsu.Extensions

A collection of useful extension methods for .NET types including strings, collections, dictionaries, enumerables, and reflection.
ktsu.AppDataStorage

A .NET library for persistent application data storage using JSON serialization. Provides a simple inherit-and-use pattern with automatic file management, thread-safe operations, debounced saves, backup recovery, and singleton access. Stores data in the user's app data folder with support for custom subdirectories and file names.
ktsu.CaseConverter

A library with extension methods to convert strings between common casings used in code.
ktsu.FuzzySearch

Lightweight .NET fuzzy string matching library with intelligent scoring for search-as-you-type, command palettes, and flexible string matching applications.

GitHub repositories (47)

Showing the top 20 popular GitHub repositories that depend on Polyfill:

Repository Stars
MaterialDesignInXAML/MaterialDesignInXamlToolkit
Google's Material Design in XAML & WPF, for C# & VB.Net.
spectreconsole/spectre.console
A .NET library that makes it easier to create beautiful console applications.
Humanizr/Humanizer
Humanizer meets all your .NET needs for manipulating and displaying strings, enums, dates, times, timespans, numbers and quantities
ClosedXML/ClosedXML
ClosedXML is a .NET library for reading, manipulating and writing Excel 2007+ (.xlsx, .xlsm) files. It aims to provide an intuitive and user-friendly interface to dealing with the underlying OpenXML API.
cyanfish/naps2
Scan documents to PDF and more, as simply as possible.
thomhurst/TUnit
A modern, fast and flexible .NET testing framework
VerifyTests/Verify
Verify is a snapshot testing tool that simplifies the assertion of complex data models and documents.
shouldly/shouldly
Should testing for .NET—the way assertions should be!
ardalis/Specification
Base class with tests for adding specifications to a DDD model
MichaelGrafnetter/DSInternals
Directory Services Internals (DSInternals) PowerShell Module and Framework
andrewlock/StronglyTypedId
A Rosyln-powered generator for strongly-typed IDs
ikvmnet/ikvm
A Java Virtual Machine and Bytecode-to-IL Converter for .NET
MarimerLLC/csla
A home for your business logic in any .NET application.
Mr-sans-and-InitLoader-s-team/Escape-From-Duckov-Coop-Mod-Preview
逃离鸭科夫联机mod（by Mr.sans & InitLoader）
andrewlock/NetEscapades.EnumGenerators
A source generator for generating fast "reflection" methods for enums
SnapXL/SnapX
SnapX is a free, open-source, cross-platform tool that lets you capture or record any area of your screen and instantly share it with a single keypress. Upload images, videos, text, and more to multiple supported destinations—all with ease. ShareX fork
mattjohnsonpint/TimeZoneConverter
Lightweight libraries to convert between IANA, Windows, Rails, and POSIX time zones.
andrewlock/NetEscapades.AspNetCore.SecurityHeaders
Small package to allow adding security headers to ASP.NET Core websites
getsentry/sentry-dotnet
Sentry SDK for .NET
json-api-dotnet/JsonApiDotNetCore
A framework for building JSON:API compliant REST APIs using ASP.NET and Entity Framework Core.
Version Downloads Last Updated
10.10.0 3,529 6/14/2026
10.9.0 735 6/13/2026
10.8.1 11,395 6/7/2026
10.8.0 5,141 6/3/2026
10.7.2 3,130 6/2/2026
10.7.1 1,843 6/1/2026
10.7.0 19,790 5/22/2026
10.6.0 6,453 5/18/2026
10.5.1 18,787 5/8/2026
10.5.0 1,812 5/7/2026
10.4.0 4,933 5/4/2026
10.3.0 45,182 4/11/2026
10.2.0 2,609 4/10/2026
10.1.1 3,467 4/9/2026
10.1.0 681 4/9/2026
10.0.0 6,761 4/5/2026
9.24.1 4,564 4/4/2026
9.24.1-beta.1 145 4/4/2026
9.24.0 3,393 4/3/2026
9.23.0 17,476 3/24/2026
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