System.Composition.AttributedModel 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.

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

Packages Downloads
System.Composition.Convention
Provides types that support using Managed Extensibility Framework with a convention-based configuration model. Commonly Used Types: System.Composition.Convention.ConventionBuilder System.Composition.Convention.ExportConventionBuilder System.Composition.Convention.ImportConventionBuilder System.Composition.Convention.PartConventionBuilder System.Composition.Convention.ParameterImportConventionBuilder
809
System.Composition.TypedParts
Provides some extension methods for the Managed Extensibility Framework. Commonly Used Types: System.Composition.CompositionContextExtensions System.Composition.Hosting.ContainerConfiguration
808
System.Composition
This packages provides a version of the Managed Extensibility Framework (MEF) that is lightweight and specifically optimized for high throughput scenarios, such as the web. Commonly Used Types: System.Composition.ExportAttribute System.Composition.ImportAttribute System.Composition.Convention.ConventionBuilder System.Composition.Hosting.CompositionHost System.Composition.CompositionContext System.Composition.CompositionContextExtensions
806
System.Composition
This packages provides a version of the Managed Extensibility Framework (MEF) that is lightweight and specifically optimized for high throughput scenarios, such as the web. Commonly Used Types: System.Composition.ExportAttribute System.Composition.ImportAttribute System.Composition.Convention.ConventionBuilder System.Composition.Hosting.CompositionHost System.Composition.CompositionContext System.Composition.CompositionContextExtensions When using NuGet 3.x this package requires at least version 3.4.
9
System.Composition
This packages provides a version of the Managed Extensibility Framework (MEF) that is lightweight and specifically optimized for high throughput scenarios, such as the web. Commonly Used Types: System.Composition.ExportAttribute System.Composition.ImportAttribute System.Composition.Convention.ConventionBuilder System.Composition.Hosting.CompositionHost System.Composition.CompositionContext System.Composition.CompositionContextExtensions
8
System.Composition.TypedParts
Provides some extension methods for the Managed Extensibility Framework. Commonly Used Types: System.Composition.CompositionContextExtensions System.Composition.Hosting.ContainerConfiguration 8321c729934c0f8be754953439b88e6e1c120c24 When using NuGet 3.x this package requires at least version 3.4.
8
System.Composition.Convention
Provides types that support using Managed Extensibility Framework with a convention-based configuration model. Commonly Used Types: System.Composition.Convention.ConventionBuilder System.Composition.Convention.ExportConventionBuilder System.Composition.Convention.ImportConventionBuilder System.Composition.Convention.PartConventionBuilder System.Composition.Convention.ParameterImportConventionBuilder
8
System.Composition
This packages provides a version of the Managed Extensibility Framework (MEF) that is lightweight and specifically optimized for high throughput scenarios, such as the web. Commonly Used Types: System.Composition.ExportAttribute System.Composition.ImportAttribute System.Composition.Convention.ConventionBuilder System.Composition.Hosting.CompositionHost System.Composition.CompositionContext System.Composition.CompositionContextExtensions When using NuGet 3.x this package requires at least version 3.4.
8
System.Composition
This packages provides a version of the Managed Extensibility Framework (MEF) that is lightweight and specifically optimized for high throughput scenarios, such as the web. Commonly Used Types: System.Composition.ExportAttribute System.Composition.ImportAttribute System.Composition.Convention.ConventionBuilder System.Composition.Hosting.CompositionHost System.Composition.CompositionContext System.Composition.CompositionContextExtensions 00490982c7952e96a1089818467caa6fd07541b2 When using NuGet 3.x this package requires at least version 3.4.
8
System.Composition
This packages provides a version of the Managed Extensibility Framework (MEF) that is lightweight and specifically optimized for high throughput scenarios, such as the web. Commonly Used Types: System.Composition.ExportAttribute System.Composition.ImportAttribute System.Composition.Convention.ConventionBuilder System.Composition.Hosting.CompositionHost System.Composition.CompositionContext System.Composition.CompositionContextExtensions
7
System.Composition
This packages provides a version of the Managed Extensibility Framework (MEF) that is lightweight and specifically optimized for high throughput scenarios, such as the web. Commonly Used Types: System.Composition.ExportAttribute System.Composition.ImportAttribute System.Composition.Convention.ConventionBuilder System.Composition.Hosting.CompositionHost System.Composition.CompositionContext System.Composition.CompositionContextExtensions When using NuGet 3.x this package requires at least version 3.4.
7
System.Composition
This package provides a version of the Managed Extensibility Framework (MEF) that is lightweight and specifically optimized for high throughput scenarios, such as the web. Commonly Used Types: System.Composition.ExportAttribute System.Composition.ImportAttribute System.Composition.Convention.ConventionBuilder System.Composition.Hosting.CompositionHost System.Composition.CompositionContext System.Composition.CompositionContextExtensions
7
System.Composition.TypedParts
Provides some extension methods for the Managed Extensibility Framework. Commonly Used Types: System.Composition.CompositionContextExtensions System.Composition.Hosting.ContainerConfiguration When using NuGet 3.x this package requires at least version 3.4.
7
System.Composition.Convention
Provides types that support using Managed Extensibility Framework with a convention-based configuration model. Commonly Used Types: System.Composition.Convention.ConventionBuilder System.Composition.Convention.ExportConventionBuilder System.Composition.Convention.ImportConventionBuilder System.Composition.Convention.PartConventionBuilder System.Composition.Convention.ParameterImportConventionBuilder When using NuGet 3.x this package requires at least version 3.4.
7

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.NET Framework 4.6.2

  • No dependencies.

.NET 8.0

  • No dependencies.

.NET 9.0

  • No dependencies.

.NET Standard 2.0

  • No dependencies.

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