System.Composition.AttributedModel 9.0.0

Prefix Reserved
dotnet add package System.Composition.AttributedModel --version 9.0.0                
NuGet\Install-Package System.Composition.AttributedModel -Version 9.0.0                
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="System.Composition.AttributedModel" Version="9.0.0" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add System.Composition.AttributedModel --version 9.0.0                
#r "nuget: System.Composition.AttributedModel, 9.0.0"                
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install System.Composition.AttributedModel as a Cake Addin
#addin nuget:?package=System.Composition.AttributedModel&version=9.0.0

// Install System.Composition.AttributedModel as a Cake Tool
#tool nuget:?package=System.Composition.AttributedModel&version=9.0.0                

About

System.Composition.AttributedModel is part of the Managed Extensibility Framework (MEF) 2.0, a composition library for .NET that enables dependency injection through attributes or conventions.

This package provides the foundational attributes that allow you to declare parts for composition, such as imports, exports, and metadata. It is used to mark classes, properties, methods, and constructors for MEF's discovery and composition process.

Key Features

  • Provides attributes for declaring composable parts, importing dependencies, metadata, and creating shared or non-shared parts

How to Use

Mark classes for export and import using attributes.

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

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

using CompositionHost container = configuration.CreateContainer();

Application app = container.GetExport<Application>();
app.Service.Execute();
// Service is running!

[Export]
public class Application
{
    [Import]
    public Service Service { get; set; }
}

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

Metadata can be used to differentiate between multiple exports of the same contract.

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

ContainerConfiguration configuration = new ContainerConfiguration()
    .WithPart<FileLogger>()
    .WithPart<ConsoleLogger>()
    .WithPart<Application>();

using CompositionHost container = configuration.CreateContainer();

Application app = container.GetExport<Application>();
app.Run();
// Using FileLogger to log.
// FileLogger: Hello, World!
// Using ConsoleLogger to log.
// ConsoleLogger: Hello, World!

public interface ILogger
{
    void Log(string message);
}

[Export(typeof(ILogger))]
[ExportMetadata("Name", "FileLogger")]
public class FileLogger : ILogger
{
    public void Log(string message) => Console.WriteLine($"FileLogger: {message}");
}

[Export(typeof(ILogger))]
[ExportMetadata("Name", "ConsoleLogger")]
public class ConsoleLogger : ILogger
{
    public void Log(string message) => Console.WriteLine($"ConsoleLogger: {message}");
}

[Export]
public class Application
{
    [ImportMany]
    public required IEnumerable<Lazy<ILogger, IDictionary<string, object>>> Loggers { get; set; }

    public void Run()
    {
        foreach (var logger in Loggers)
        {
            var name = logger.Metadata["Name"];

            Console.WriteLine($"Using {name} to log.");
            logger.Value.Log("Hello, World!");
        }
    }
}

Main Types

The main types provided by this library are:

  • System.Composition.ExportAttribute
  • System.Composition.ImportAttribute
  • System.Composition.ExportMetadataAttribute

Additional Documentation

Feedback & Contributing

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

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 is compatible. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 is compatible.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.
  • .NETFramework 4.6.2

    • No dependencies.
  • .NETStandard 2.0

    • No dependencies.
  • net8.0

    • No dependencies.
  • net9.0

    • No dependencies.

NuGet packages (72)

Showing the top 5 NuGet packages that depend on System.Composition.AttributedModel:

Package Downloads
System.Composition.TypedParts

Provides container configuration and some extension methods for the Managed Extensibility Framework (MEF).

System.Composition.Convention

Provides types that support using Managed Extensibility Framework (MEF) with a convention-based configuration model.

System.Composition

Provides a version of the Managed Extensibility Framework (MEF) that is lightweight and specifically optimized for high throughput scenarios, such as the web.

Microsoft.VisualStudio.Utilities

A member of the Visual Studio SDK

Microsoft.VisualStudio.Composition

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

GitHub repositories (30)

Showing the top 5 popular GitHub repositories that depend on System.Composition.AttributedModel:

Repository Stars
JustArchiNET/ArchiSteamFarm
C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.
neuecc/Utf8Json
Definitely Fastest and Zero Allocation JSON Serializer for C#(NET, .NET Core, Unity, Xamarin).
dotnet/ResXResourceManager
Manage localization of all ResX-Based resources in one central place.
security-code-scan/security-code-scan
Vulnerability Patterns Detector for C# and VB.NET
icsharpcode/RefactoringEssentials
Refactoring Essentials for Visual Studio
Version Downloads Last updated
9.0.0 133 11/12/2024
9.0.0-rc.2.24473.5 620 10/8/2024
9.0.0-rc.1.24431.7 556 9/10/2024
9.0.0-preview.7.24405.7 733 8/13/2024
9.0.0-preview.6.24327.7 576 7/9/2024
9.0.0-preview.5.24306.7 459 6/11/2024
9.0.0-preview.4.24266.19 408 5/21/2024
9.0.0-preview.3.24172.9 709 4/11/2024
9.0.0-preview.2.24128.5 630 3/12/2024
9.0.0-preview.1.24080.9 9,060 2/13/2024
8.0.0 5,552,518 11/14/2023
8.0.0-rc.2.23479.6 3,664 10/10/2023
8.0.0-rc.1.23419.4 1,101 9/12/2023
8.0.0-preview.7.23375.6 1,096 8/8/2023
8.0.0-preview.6.23329.7 1,158 7/11/2023
8.0.0-preview.5.23280.8 785 6/13/2023
8.0.0-preview.4.23259.5 1,055 5/16/2023
8.0.0-preview.3.23174.8 1,044 4/11/2023
8.0.0-preview.2.23128.3 1,005 3/14/2023
8.0.0-preview.1.23110.8 651 2/21/2023
7.0.0 20,227,108 11/7/2022
7.0.0-rc.2.22472.3 792 10/11/2022
7.0.0-rc.1.22426.10 473 9/14/2022
7.0.0-preview.7.22375.6 459 8/9/2022
7.0.0-preview.6.22324.4 578 7/12/2022
7.0.0-preview.5.22301.12 3,195 6/14/2022
7.0.0-preview.4.22229.4 725 5/10/2022
7.0.0-preview.3.22175.4 723 4/13/2022
7.0.0-preview.2.22152.2 546 3/14/2022
7.0.0-preview.1.22076.8 417 2/17/2022
6.0.0 73,129,451 11/8/2021
6.0.0-rc.2.21480.5 878 10/12/2021
6.0.0-rc.1.21451.13 1,356 9/14/2021
6.0.0-preview.7.21377.19 2,633 8/10/2021
6.0.0-preview.6.21352.12 1,389 7/14/2021
6.0.0-preview.5.21301.5 431 6/15/2021
6.0.0-preview.4.21253.7 516 5/24/2021
6.0.0-preview.3.21201.4 671 4/8/2021
6.0.0-preview.2.21154.6 2,380 3/11/2021
6.0.0-preview.1.21102.12 1,122 2/12/2021
5.0.1 1,242,025 1/12/2021 5.0.1 is deprecated because it is no longer maintained.
5.0.0 662,757 11/9/2020 5.0.0 is deprecated because it is no longer maintained.
5.0.0-rc.2.20475.5 12,623 10/13/2020
5.0.0-rc.1.20451.14 836 9/14/2020
5.0.0-preview.8.20407.11 1,056 8/25/2020
5.0.0-preview.7.20364.11 709 7/21/2020
5.0.0-preview.6.20305.6 2,085 6/25/2020
5.0.0-preview.5.20278.1 756 6/10/2020
5.0.0-preview.4.20251.6 813 5/18/2020
5.0.0-preview.3.20214.6 629 4/23/2020
5.0.0-preview.2.20160.6 1,004 4/2/2020
5.0.0-preview.1.20120.5 676 3/16/2020
1.4.1 608,581 5/12/2020
1.4.0 1,027,123 12/3/2019
1.4.0-preview3.19551.4 1,772 11/13/2019
1.4.0-preview2.19523.17 751 11/1/2019
1.4.0-preview1.19504.10 680 10/15/2019
1.3.0 1,151,620 9/23/2019
1.3.0-rc1.19456.4 826 9/16/2019
1.3.0-preview9.19421.4 819 9/4/2019
1.3.0-preview9.19416.11 501 9/4/2019
1.3.0-preview8.19405.3 1,594 8/13/2019
1.3.0-preview7.19362.9 1,549 7/23/2019
1.3.0-preview6.19303.8 1,114 6/12/2019
1.3.0-preview6.19264.9 500 9/4/2019
1.3.0-preview5.19224.8 3,228 5/6/2019
1.3.0-preview4.19212.13 967 4/18/2019
1.3.0-preview3.19128.7 1,358 3/6/2019
1.3.0-preview.19073.11 21,456 1/29/2019
1.3.0-preview.18571.3 1,691 12/3/2018
1.2.0 2,479,466 5/29/2018
1.2.0-rc1 3,567 5/6/2018
1.2.0-preview2-26406-04 3,976 4/10/2018
1.2.0-preview1-26216-02 4,247 2/26/2018
1.1.0 2,372,574 8/11/2017
1.1.0-preview2-25405-01 6,102 6/27/2017
1.1.0-preview1-25305-02 348,272 5/9/2017
1.0.31 176,547,660 11/15/2016
1.0.31-preview1-24530-04 3,387 10/24/2016