# dotnet/corefx

This repo is used for servicing PR's for .NET Core 2.1 and 3.1. Please visit us at https://github.com/dotnet/runtime

Repository: https://github.com/dotnet/corefx
Canonical: https://ross.abutalabs.com/products/corefx
Homepage: https://docs.microsoft.com/dotnet/core/
License Family: other
Topics: corefx, coreclr, microsoft, csharp, dotnet, dotnet-core, dotnetcore
Archived: true
Last push: 2023-01-21T00:07:42+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4318, "days_push": 1321, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 17479, forks 4792 (observed 2026-08-28T04:11:19.908975+00:00)

## What it is
dotnet/corefx was the repository for .NET Core's base class libraries (CoreFX). It has been consolidated into dotnet/runtime and now only services .NET Core 2.1 and 3.1 patches.

## Use cases
- find .NET Core base class library source
- service a .NET Core 2.1 or 3.1 patch
- understand where CoreFX code moved

## When to choose
- you maintain .NET Core 2.1/3.1 and need servicing PRs
- you need historical CoreFX source

## When to avoid
- developing against modern .NET - use dotnet/runtime instead

## Facets
- artifact type: library
- maturity: maintenance
- function: sdk
- domain: developer-tools, cross-platform
- platform: cross-platform, windows
- tags: dotnet, csharp, base-class-library, archived, runtime-libraries, linux, macos

## Member repositories
- dotnet/corefx (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:19.908975+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:02:55.679944+00:00, confidence not recorded.
  - readme: https://github.com/dotnet/corefx (fetched 2026-08-28T04:11:19.908975+00:00, sha c10ab44da93a)
  - homepage: https://docs.microsoft.com/dotnet/core/ (fetched 2026-08-29T08:01:24.171557+00:00, sha 03a7165c9941)
  - site_page: https://learn.microsoft.com/en-us/dotnet/core/install/windows (fetched 2026-08-29T08:01:24.176842+00:00, sha 2257f52720dc)
  - site_page: https://learn.microsoft.com/en-us/dotnet/core/install/linux-ubuntu (fetched 2026-08-29T08:01:24.180543+00:00, sha be803210fe7e)
  - site_page: https://learn.microsoft.com/en-us/dotnet/core/install/how-to-detect-installed-versions (fetched 2026-08-29T08:01:24.182665+00:00, sha 6ba301148f7b)
  - site_page: https://learn.microsoft.com/en-us/lifecycle/faq/internet-explorer-microsoft-edge (fetched 2026-08-29T08:01:24.174002+00:00, sha c363b2f43d4b)
- Data as of 2026-08-30T08:39:29.467469+00:00.