System.Composition 10.0.2

About

Provides the Managed Extensibility Framework (MEF) 2.0, a lightweight, attribute-driven Dependency Injection (DI) container.

MEF simplifies the composition of applications by allowing components to be loosely coupled and dynamically discovered. This package supports the development of modular and maintainable applications by enabling parts to be composed at runtime.

Key Features

  • Components are discovered and composed using attributes.
  • Provides dependency injection capabilities for loosely coupled modules.

How to Use

Running code from a discovered component.

using System.Composition;
using System.Composition.Hosting;

var configuration = new ContainerConfiguration().WithPart<Service>();

using var container = configuration.CreateContainer();

var service = container.GetExport<Service>();
service.Execute();
// Output: Service is running!

[Export]
public class Service
{
    public void Execute() => Console.WriteLine("Service is running!");
}

Main Types

The main types provided by this library are:

  • System.Composition.ExportAttribute
  • System.Composition.ImportAttribute
  • System.Composition.Convention.ConventionBuilder
  • System.Composition.Hosting.CompositionHost
  • System.Composition.CompositionContext
  • System.Composition.CompositionContextExtensions

Additional Documentation

Feedback & Contributing

System.Composition is released as open source under the MIT license. Bug reports and contributions are welcome at the GitHub repository.

Showing the top 20 packages that depend on System.Composition.

Packages Downloads
Microsoft.CodeAnalysis.CSharp.Features
.NET Compiler Platform ("Roslyn") support for creating C# editing experiences. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/2b7d172669b2f7e55803b55f317cfcc2d4279d76.
 121
Microsoft.CodeAnalysis.CSharp.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing C# projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/bf8791d0d1be92c24e56cefa52aa139e2b5340c2.
 136
Microsoft.CodeAnalysis.CSharp.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing C# projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/e482b6e281d7db727fcb086ebbfae44dcba82c6d.
 120
Microsoft.CodeAnalysis.CSharp.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing C# projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/e68227ea677b76a3c603bd616f03ea6d952b2458.
 126
Microsoft.CodeAnalysis.CSharp.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing C# projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/fa72fa61b0d822ea8a3fbeb96f668340419ab5cd.
 144
Microsoft.CodeAnalysis.VisualBasic.Features
.NET Compiler Platform ("Roslyn") support for creating Visual Basic editing experiences. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/e68227ea677b76a3c603bd616f03ea6d952b2458.
 116
Microsoft.CodeAnalysis.VisualBasic.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing Visual Basic projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/bde21ee2b98b775b010d01a93f81ef587fe80962.
 117
Microsoft.CodeAnalysis.VisualBasic.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing Visual Basic projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/cf82d399c36008e7936d545cde24141f8d3790fa.
 116
Microsoft.CodeAnalysis.VisualBasic.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing Visual Basic projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/e482b6e281d7db727fcb086ebbfae44dcba82c6d.
 131
Microsoft.CodeAnalysis.VisualBasic.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing Visual Basic projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/e68227ea677b76a3c603bd616f03ea6d952b2458.
 132
Microsoft.CodeAnalysis.VisualBasic.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing Visual Basic projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/fa72fa61b0d822ea8a3fbeb96f668340419ab5cd.
 132
Microsoft.CodeAnalysis.Workspaces.Common
A shared package used by the .NET Compiler Platform ("Roslyn") including support for analyzing projects and solutions. Do not install this package manually, it will be added as a prerequisite by other packages that require it. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/1ce8866c9de4c2d67351ef6863699dee03b0804a.
 157
Microsoft.CodeAnalysis.Workspaces.Common
A shared package used by the .NET Compiler Platform ("Roslyn") including support for analyzing projects and solutions. Do not install this package manually, it will be added as a prerequisite by other packages that require it. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/231aeb8be8357239499d45c0574e5a9a8c9174f0.
 124
Microsoft.CodeAnalysis.Workspaces.Common
A shared package used by the .NET Compiler Platform ("Roslyn") including support for analyzing projects and solutions. Do not install this package manually, it will be added as a prerequisite by other packages that require it. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/50bd09a9eefdf9bc3653dbf6d9624b31a023c7c0.
 116
Microsoft.CodeAnalysis.Workspaces.Common
A shared package used by the .NET Compiler Platform ("Roslyn") including support for analyzing projects and solutions. Do not install this package manually, it will be added as a prerequisite by other packages that require it. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/5f00f4d6ffb242a337e21a196aab0593891e430e.
 125
Microsoft.CodeAnalysis.Workspaces.Common
A shared package used by the .NET Compiler Platform ("Roslyn") including support for analyzing projects and solutions. Do not install this package manually, it will be added as a prerequisite by other packages that require it. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/6a5a63bbc9f4449d9bd1e95a8f9624939c3ccdc3.
 173
Microsoft.CodeAnalysis.Workspaces.Common
A shared package used by the .NET Compiler Platform ("Roslyn") including support for analyzing projects and solutions. Do not install this package manually, it will be added as a prerequisite by other packages that require it. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/81d9274600db701a8b08ed8af3fd6b00a775cc33.
 214
Microsoft.CodeAnalysis.Workspaces.Common
A shared package used by the .NET Compiler Platform ("Roslyn") including support for analyzing projects and solutions. Do not install this package manually, it will be added as a prerequisite by other packages that require it. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/df45061e218c9b5813c5531bc06fb238a23e30f6.
 148
Microsoft.CodeAnalysis.Workspaces.Common
A shared package used by the .NET Compiler Platform ("Roslyn") including support for analyzing projects and solutions. Do not install this package manually, it will be added as a prerequisite by other packages that require it. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/e091728607ca0fc9efca55ccfb3e59259c6b5a0a.
 382
Microsoft.CodeAnalysis.Workspaces.MSBuild
.NET Compiler Platform ("Roslyn") support for analyzing MSBuild projects and solutions. This should be used with at least one of the following packages to add the appropriate language support: - Microsoft.CodeAnalysis.CSharp.Workspaces - Microsoft.CodeAnalysis.VisualBasic.Workspaces More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/e68227ea677b76a3c603bd616f03ea6d952b2458.
 123

https://go.microsoft.com/fwlink/?LinkID=799421

.NET Framework 4.6.2

.NET Standard 2.0

.NET 10.0

.NET 9.0

.NET 8.0

Version Downloads Last updated
10.0.2 6 01/13/2026
10.0.1 10 12/13/2025
10.0.0 32 11/12/2025
10.0.0-rc.2.25502.107 44 10/15/2025
10.0.0-rc.1.25451.107 57 09/10/2025
10.0.0-preview.7.25380.108 53 08/14/2025
10.0.0-preview.6.25358.103 67 07/17/2025
10.0.0-preview.5.25277.114 61 06/07/2025
10.0.0-preview.4.25258.110 65 05/16/2025
10.0.0-preview.3.25171.5 80 04/13/2025
10.0.0-preview.2.25163.2 76 04/01/2025
10.0.0-preview.1.25080.5 73 04/01/2025
9.0.12 5 01/13/2026
9.0.11 31 11/11/2025
9.0.10 43 10/15/2025
9.0.9 58 09/10/2025
9.0.8 57 08/05/2025
9.0.7 64 07/09/2025
9.0.6 69 06/12/2025
9.0.5 67 05/17/2025
9.0.4 79 04/10/2025
9.0.3 70 03/31/2025
9.0.2 77 03/31/2025
9.0.1 79 04/01/2025
9.0.0 78 11/14/2024
9.0.0-rc.2.24473.5 71 10/22/2024
9.0.0-rc.1.24431.7 74 09/19/2024
9.0.0-preview.7.24405.7 78 08/18/2024
9.0.0-preview.6.24327.7 94 07/18/2024
9.0.0-preview.5.24306.7 96 07/18/2024
9.0.0-preview.4.24266.19 92 07/18/2024
9.0.0-preview.3.24172.9 101 07/18/2024
9.0.0-preview.2.24128.5 97 07/18/2024
9.0.0-preview.1.24080.9 95 07/18/2024
8.0.0 93 07/18/2024
8.0.0-rc.2.23479.6 97 07/18/2024
8.0.0-rc.1.23419.4 101 07/18/2024
8.0.0-preview.7.23375.6 93 07/18/2024
8.0.0-preview.6.23329.7 95 07/18/2024
8.0.0-preview.5.23280.8 100 07/18/2024
8.0.0-preview.4.23259.5 94 07/18/2024
8.0.0-preview.3.23174.8 103 07/18/2024
8.0.0-preview.2.23128.3 105 07/18/2024
8.0.0-preview.1.23110.8 100 07/18/2024
7.0.0 412 02/05/2024
7.0.0-rc.2.22472.3 97 07/18/2024
7.0.0-rc.1.22426.10 108 07/18/2024
7.0.0-preview.7.22375.6 105 07/18/2024
7.0.0-preview.6.22324.4 98 07/18/2024
7.0.0-preview.5.22301.12 108 07/18/2024
7.0.0-preview.4.22229.4 101 07/18/2024
7.0.0-preview.3.22175.4 126 07/18/2024
7.0.0-preview.2.22152.2 100 07/18/2024
7.0.0-preview.1.22076.8 115 07/18/2024
6.0.2-mauipre.1.22102.15 68 01/10/2025
6.0.2-mauipre.1.22054.8 79 04/08/2025
6.0.0 202 02/04/2024
6.0.0-rc.2.21480.5 98 07/18/2024
6.0.0-rc.1.21451.13 105 07/18/2024
6.0.0-preview.7.21377.19 120 07/18/2024
6.0.0-preview.6.21352.12 92 07/18/2024
6.0.0-preview.5.21301.5 99 07/18/2024
6.0.0-preview.4.21253.7 103 07/18/2024
6.0.0-preview.3.21201.4 79 07/18/2024
6.0.0-preview.2.21154.6 99 07/18/2024
6.0.0-preview.1.21102.12 98 07/18/2024
5.0.1 113 07/18/2024
5.0.0 107 07/18/2024
5.0.0-rc.2.20475.5 95 07/18/2024
5.0.0-rc.1.20451.14 102 07/18/2024
5.0.0-preview.8.20407.11 108 07/18/2024
5.0.0-preview.7.20364.11 101 07/18/2024
5.0.0-preview.6.20305.6 102 07/18/2024
5.0.0-preview.5.20278.1 100 07/18/2024
5.0.0-preview.4.20251.6 94 07/18/2024
5.0.0-preview.3.20214.6 104 07/18/2024
5.0.0-preview.2.20160.6 104 07/18/2024
5.0.0-preview.1.20120.5 95 07/18/2024
1.4.1 108 07/18/2024
1.4.0 96 07/18/2024
1.4.0-preview3.19551.4 103 07/18/2024
1.4.0-preview2.19523.17 100 07/18/2024
1.4.0-preview1.19504.10 107 07/18/2024
1.3.0 103 07/18/2024
1.3.0-rc1.19456.4 91 07/18/2024
1.3.0-preview9.19421.4 90 07/18/2024
1.3.0-preview9.19416.11 98 07/18/2024
1.3.0-preview8.19405.3 96 07/18/2024
1.3.0-preview7.19362.9 97 07/18/2024
1.3.0-preview6.19303.8 101 07/18/2024
1.3.0-preview6.19264.9 93 07/18/2024
1.3.0-preview5.19224.8 101 07/18/2024
1.3.0-preview4.19212.13 111 07/18/2024
1.3.0-preview3.19128.7 98 07/18/2024
1.3.0-preview.19073.11 111 07/18/2024
1.3.0-preview.18571.3 95 07/18/2024
1.2.0 109 07/18/2024
1.2.0-rc1 122 07/18/2024
1.2.0-preview2-26406-04 98 07/18/2024
1.2.0-preview1-26216-02 104 07/18/2024
1.1.0 99 07/18/2024
1.1.0-preview2-25405-01 97 07/18/2024
1.1.0-preview1-25305-02 101 07/18/2024
1.0.31 127 02/04/2024
1.0.31-preview1-24530-04 97 07/18/2024