Class CompositionContextExportDescriptorProvider

A composition context export descriptor provider.

Inheritance
System.Object
System.Composition.Hosting.Core.ExportDescriptorProvider
CompositionContextExportDescriptorProvider
Implements
Inherited Members
System.Composition.Hosting.Core.ExportDescriptorProvider.NoExportDescriptors
System.Composition.Hosting.Core.ExportDescriptorProvider.NoMetadata
System.Composition.Hosting.Core.ExportDescriptorProvider.NoDependencies
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Kephas.Composition.Mef.ExportProviders
Assembly: Kephas.Composition.Mef.dll
Syntax
public class CompositionContextExportDescriptorProvider : ExportDescriptorProvider, IExportProvider

Constructors

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CompositionContextExportDescriptorProvider(ICompositionContext)

Initializes a new instance of the CompositionContextExportDescriptorProvider class.

Declaration
public CompositionContextExportDescriptorProvider(ICompositionContext compositionContainer)
Parameters
Type Name Description
ICompositionContext compositionContainer

The composition container.

Methods

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GetExportDescriptors(CompositionContract, DependencyAccessor)

Promise export descriptors for composition context.

Declaration
public override IEnumerable<ExportDescriptorPromise> GetExportDescriptors(CompositionContract contract, DependencyAccessor descriptorAccessor)
Parameters
Type Name Description
System.Composition.Hosting.Core.CompositionContract contract

The export key required by another component.
System.Composition.Hosting.Core.DependencyAccessor descriptorAccessor

Accesses the other export descriptors present in the composition.
Returns
Type Description
System.Collections.Generic.IEnumerable<System.Composition.Hosting.Core.ExportDescriptorPromise>

Promises for new export descriptors.
Overrides
System.Composition.Hosting.Core.ExportDescriptorProvider.GetExportDescriptors(System.Composition.Hosting.Core.CompositionContract, System.Composition.Hosting.Core.DependencyAccessor)
Remarks

A provider will only be queried once for each unique export key. The descriptor accessor can only be queried immediately if the descriptor being promised is an adapter, such as System.Lazy<T>; otherwise, dependencies should only be queried within execution of the function provided to the System.Composition.Hosting.Core.ExportDescriptorPromise. The actual descriptors provided should not close over or reference any aspect of the dependency/promise structure, as this should be able to be GC'ed.

Implements

Extension Methods