System.Composition 9.0.18

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.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/8edf7bcd4f1594c3d68a6a567469f41dbd33dd1b.
 179
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.
 180
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.
 188
Microsoft.CodeAnalysis.Features
.NET Compiler Platform ("Roslyn") support for creating 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.
 172
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.
 174
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.
 178
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.
 202
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/2ad4aabc7a9dada097e54e544ebba48ab1c05074
 181
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/2c94423e50a72aea8a4962d8722641d06bc88b13
 175
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/49a655e40d938aa74b1d149b407c30cbb2287d71.
 183
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.
 181
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.
 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/6a5a63bbc9f4449d9bd1e95a8f9624939c3ccdc3.
 232
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/7d47461d2ddd32defbc51c2cf0e75a3fef16c3d7.
 170
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.
 274
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/8e1779e16298415843e85029d8b52a1ae9bb4c30.
 170
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.
 198
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.
 451
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/8edf7bcd4f1594c3d68a6a567469f41dbd33dd1b.
 188
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/fa72fa61b0d822ea8a3fbeb96f668340419ab5cd.
 175

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

.NET Framework 4.6.2

.NET Standard 2.0

.NET 9.0

.NET 8.0

Version Downloads Last updated
11.0.0-preview.6.26359.118 1 07/14/2026
11.0.0-preview.5.26302.115 12 06/09/2026
11.0.0-preview.4.26230.115 17 05/12/2026
11.0.0-preview.3.26207.106 28 04/14/2026
11.0.0-preview.2.26159.112 31 03/11/2026
11.0.0-preview.1.26104.118 33 02/12/2026
10.0.10 1 07/14/2026
10.0.9 11 06/09/2026
10.0.8 15 05/13/2026
10.0.7 26 04/21/2026
10.0.6 27 04/14/2026
10.0.5 29 03/15/2026
10.0.4 28 03/11/2026
10.0.3 40 02/12/2026
10.0.2 40 01/13/2026
10.0.1 42 12/13/2025
10.0.0 72 11/12/2025
10.0.0-rc.2.25502.107 81 10/15/2025
10.0.0-rc.1.25451.107 88 09/10/2025
10.0.0-preview.7.25380.108 84 08/14/2025
10.0.0-preview.6.25358.103 102 07/17/2025
10.0.0-preview.5.25277.114 83 06/07/2025
10.0.0-preview.4.25258.110 102 05/16/2025
10.0.0-preview.3.25171.5 109 04/13/2025
10.0.0-preview.2.25163.2 113 04/01/2025
10.0.0-preview.1.25080.5 106 04/01/2025
9.0.18 1 07/14/2026
9.0.17 14 06/09/2026
9.0.16 19 05/12/2026
9.0.15 29 04/14/2026
9.0.14 33 03/11/2026
9.0.13 37 02/12/2026
9.0.12 36 01/13/2026
9.0.11 68 11/11/2025
9.0.10 89 10/15/2025
9.0.9 103 09/10/2025
9.0.8 85 08/05/2025
9.0.7 88 07/09/2025
9.0.6 121 06/12/2025
9.0.5 112 05/17/2025
9.0.4 119 04/10/2025
9.0.3 102 03/31/2025
9.0.2 111 03/31/2025
9.0.1 114 04/01/2025
9.0.0 133 11/14/2024
9.0.0-rc.2.24473.5 104 10/22/2024
9.0.0-rc.1.24431.7 112 09/19/2024
9.0.0-preview.7.24405.7 105 08/18/2024
9.0.0-preview.6.24327.7 130 07/18/2024
9.0.0-preview.5.24306.7 137 07/18/2024
9.0.0-preview.4.24266.19 123 07/18/2024
9.0.0-preview.3.24172.9 134 07/18/2024
9.0.0-preview.2.24128.5 128 07/18/2024
9.0.0-preview.1.24080.9 125 07/18/2024
8.0.0 127 07/18/2024
8.0.0-rc.2.23479.6 127 07/18/2024
8.0.0-rc.1.23419.4 137 07/18/2024
8.0.0-preview.7.23375.6 131 07/18/2024
8.0.0-preview.6.23329.7 136 07/18/2024
8.0.0-preview.5.23280.8 130 07/18/2024
8.0.0-preview.4.23259.5 126 07/18/2024
8.0.0-preview.3.23174.8 131 07/18/2024
8.0.0-preview.2.23128.3 133 07/18/2024
8.0.0-preview.1.23110.8 135 07/18/2024
7.0.0 468 02/05/2024
7.0.0-rc.2.22472.3 125 07/18/2024
7.0.0-rc.1.22426.10 141 07/18/2024
7.0.0-preview.7.22375.6 138 07/18/2024
7.0.0-preview.6.22324.4 132 07/18/2024
7.0.0-preview.5.22301.12 138 07/18/2024
7.0.0-preview.4.22229.4 134 07/18/2024
7.0.0-preview.3.22175.4 157 07/18/2024
7.0.0-preview.2.22152.2 132 07/18/2024
7.0.0-preview.1.22076.8 153 07/18/2024
6.0.2-mauipre.1.22102.15 97 01/10/2025
6.0.2-mauipre.1.22054.8 115 04/08/2025
6.0.0 236 02/04/2024
6.0.0-rc.2.21480.5 130 07/18/2024
6.0.0-rc.1.21451.13 140 07/18/2024
6.0.0-preview.7.21377.19 146 07/18/2024
6.0.0-preview.6.21352.12 122 07/18/2024
6.0.0-preview.5.21301.5 136 07/18/2024
6.0.0-preview.4.21253.7 135 07/18/2024
6.0.0-preview.3.21201.4 115 07/18/2024
6.0.0-preview.2.21154.6 132 07/18/2024
6.0.0-preview.1.21102.12 132 07/18/2024
5.0.1 149 07/18/2024
5.0.0 137 07/18/2024
5.0.0-rc.2.20475.5 125 07/18/2024
5.0.0-rc.1.20451.14 138 07/18/2024
5.0.0-preview.8.20407.11 139 07/18/2024
5.0.0-preview.7.20364.11 141 07/18/2024
5.0.0-preview.6.20305.6 136 07/18/2024
5.0.0-preview.5.20278.1 136 07/18/2024
5.0.0-preview.4.20251.6 126 07/18/2024
5.0.0-preview.3.20214.6 134 07/18/2024
5.0.0-preview.2.20160.6 132 07/18/2024
5.0.0-preview.1.20120.5 125 07/18/2024
1.4.1 155 07/18/2024
1.4.0 127 07/18/2024
1.4.0-preview3.19551.4 137 07/18/2024
1.4.0-preview2.19523.17 134 07/18/2024
1.4.0-preview1.19504.10 157 07/18/2024
1.3.0 147 07/18/2024
1.3.0-rc1.19456.4 118 07/18/2024
1.3.0-preview9.19421.4 125 07/18/2024
1.3.0-preview9.19416.11 131 07/18/2024
1.3.0-preview8.19405.3 135 07/18/2024
1.3.0-preview7.19362.9 132 07/18/2024
1.3.0-preview6.19303.8 139 07/18/2024
1.3.0-preview6.19264.9 123 07/18/2024
1.3.0-preview5.19224.8 139 07/18/2024
1.3.0-preview4.19212.13 144 07/18/2024
1.3.0-preview3.19128.7 130 07/18/2024
1.3.0-preview.19073.11 139 07/18/2024
1.3.0-preview.18571.3 133 07/18/2024
1.2.0 139 07/18/2024
1.2.0-rc1 157 07/18/2024
1.2.0-preview2-26406-04 135 07/18/2024
1.2.0-preview1-26216-02 134 07/18/2024
1.1.0 131 07/18/2024
1.1.0-preview2-25405-01 141 07/18/2024
1.1.0-preview1-25305-02 136 07/18/2024
1.0.31 165 02/04/2024
1.0.31-preview1-24530-04 130 07/18/2024