https://github.com/microsoft/vs-mef

Managed Extensibility Framework (MEF) implementation used by Visual Studio
https://github.com/microsoft/vs-mef

extensibility extensibility-engine mef visual-studio

Last synced: about 1 year ago
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Managed Extensibility Framework (MEF) implementation used by Visual Studio

• Host: GitHub
• URL: https://github.com/microsoft/vs-mef
• Owner: microsoft
• License: mit
• Created: 2017-04-25T00:47:05.000Z (about 9 years ago)
• Default Branch: main
• Last Pushed: 2025-05-07T19:53:42.000Z (about 1 year ago)
• Last Synced: 2025-05-07T23:48:04.306Z (about 1 year ago)
• Topics: extensibility, extensibility-engine, mef, visual-studio
• Language: C#
• Size: 10.3 MB
• Stars: 446
• Watchers: 28
• Forks: 87
• Open Issues: 33
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE
  • Code of conduct: CODE_OF_CONDUCT.md
  • Security: SECURITY.md
  • Support: SUPPORT.md

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README

          
# vs-mef

[![Build Status](https://dev.azure.com/azure-public/vside/_apis/build/status/vs-mef)](https://dev.azure.com/azure-public/vside/_build/latest?definitionId=17)

[![codecov](https://codecov.io/gh/Microsoft/vs-mef/branch/main/graph/badge.svg)](https://codecov.io/gh/Microsoft/vs-mef)

This repo contains the Visual Studio team's implementation of .NET's managed extensibility framework.

It is broken up into several NuGet packages, as listed below.

## Microsoft.VisualStudio.Composition

[![NuGet package](https://img.shields.io/nuget/v/Microsoft.VisualStudio.Composition.svg)](https://www.nuget.org/packages/Microsoft.VisualStudio.Composition)

Lightning fast MEF engine, supporting System.ComponentModel.Composition and System.Composition.

### Features

* A new, faster host for your existing MEF parts

* Reuse the MEF attributes you're already using

* `ExportFactory` support to create sub-containers with scoped lifetime (i.e. sharing boundaries)

### Documentation

* [Why VS-MEF?](doc/why.md)

* [Differences between .NET MEF, NuGet MEF and VS MEF](doc/mef_library_differences.md)

* [Hosting](doc/hosting.md)

* [more docs](doc/index.md)

[Learn more about this package](src/Microsoft.VisualStudio.Composition/README.md).

## Microsoft.VisualStudio.Composition.Analyzers

[![NuGet package](https://img.shields.io/nuget/v/Microsoft.VisualStudio.Composition.Analyzers.svg)](https://www.nuget.org/packages/Microsoft.VisualStudio.Composition.Analyzers)

Analyzers for MEF consumers to help identify common errors in MEF parts.

[Learn more about this package](src/Microsoft.VisualStudio.Composition.Analyzers/README.md).

## Microsoft.VisualStudio.Composition.AppHost

[![NuGet package](https://img.shields.io/nuget/v/Microsoft.VisualStudio.Composition.AppHost.svg)](https://www.nuget.org/packages/Microsoft.VisualStudio.Composition.AppHost)

Adds a VS MEF system with a pre-computed, cached MEF graph.

[Learn more about this package](src/Microsoft.VisualStudio.Composition.AppHost/README.md).

## Microsoft.VisualStudio.Composition.VSMefx

A diagnostic tool to understand catalogs, compositions and diagnose issues in them.

[Learn more about this package](src/Microsoft.VisualStudio.Composition.VSMefx/README.md).