System.Composition.AttributedModel 9.0.0-rc.2.24473.5
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
Related Packages
- System.Composition
- System.Composition.Convention
- System.Composition.Hosting
- System.Composition.Runtime
- System.Composition.TypedParts
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
|
51 |
System.Composition.TypedParts
Provides some extension methods for the Managed Extensibility Framework.
Commonly Used Types:
System.Composition.CompositionContextExtensions
System.Composition.Hosting.ContainerConfiguration
|
45 |
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.
|
44 |
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
|
43 |
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.
|
41 |
System.Composition.TypedParts
Provides some extension methods for the Managed Extensibility Framework.
Commonly Used Types:
System.Composition.CompositionContextExtensions
System.Composition.Hosting.ContainerConfiguration
|
41 |
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.
|
39 |
System.Composition.TypedParts
Provides some extension methods for the Managed Extensibility Framework.
Commonly Used Types:
System.Composition.CompositionContextExtensions
System.Composition.Hosting.ContainerConfiguration
|
39 |
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.
|
39 |
System.Composition.TypedParts
Provides some extension methods for the Managed Extensibility Framework.
Commonly Used Types:
System.Composition.CompositionContextExtensions
System.Composition.Hosting.ContainerConfiguration
|
38 |
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
|
38 |
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.
|
38 |
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.
|
38 |
System.Composition.TypedParts
Provides some extension methods for the Managed Extensibility Framework.
Commonly Used Types:
System.Composition.CompositionContextExtensions
System.Composition.Hosting.ContainerConfiguration
|
37 |
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
|
36 |
System.Composition.TypedParts
Provides some extension methods for the Managed Extensibility Framework.
Commonly Used Types:
System.Composition.CompositionContextExtensions
System.Composition.Hosting.ContainerConfiguration
|
36 |
.NET Framework 4.6.2
- No dependencies.
.NET 8.0
- No dependencies.
.NET 9.0
- No dependencies.
.NET Standard 2.0
- No dependencies.