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microsoft/vs-mef

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microsoft/vs-mef

Description: Managed Extensibility Framework (MEF) implementation used by Visual Studio

Language: C#

License: MIT

Stars: 464

Forks: 90

Open issues: 24

Created: 2017-04-25T00:47:05Z

Pushed: 2026-06-10T16:47:15Z

Default branch: main

Fork: no

Archived: no

README:

vs-mef

![Build Status](https://dev.azure.com/azure-public/vside/_build/latest?definitionId=17) ![codecov](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

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

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

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

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).