ExportFactory<T> Class

Definition

Namespace:

System.ComponentModel.Composition

Assembly:

System.ComponentModel.Composition.dll

Package:

System.ComponentModel.Composition v10.0.0-preview.1.25080.5

Source:

ExportFactoryOfT.cs

A factory that creates new instances of a part that provides the specified export.

C#

public class ExportFactory<T>

Type Parameters

T

The type of the export.

Inheritance

Object

ExportFactory<T>

Derived

System.ComponentModel.Composition.ExportFactory<T,TMetadata>

Remarks

When you refer indirectly to a part by using a Lazy<T> object, the Value property always returns a reference to the same object. In some circumstances, you might want each reference to result in the creation of a new object. ExportFactory<T> is designed for those scenarios.

ExportFactory<T> can be used in a similar fashion to Lazy<T> when creating attributed parts. That is, an import contract that is defined on ExportFactory<T> with a generic parameter of T will match an export that is defined on T. For example, the follow export and import match:

C#

[Export]  
public String myData = "Example Data.";  

[Import]  
public ExportFactory<String> theData { get; set; }  

The ExportFactory<T>.CreateExport method returns an ExportLifetimeContext<T> object, which has two pieces. The ExportLifetimeContext<T>.Value property provides access to the created part. Calling the Dispose method of the ExportLifetimeContext<T> object cleans up the created part and all of its dependencies, thereby allowing the part's lifetime to be managed without reference to the container that created it.

Constructors

ExportFactory<T>(Func<Tuple<T,Action>>)

Initializes a new instance of the ExportFactory<T> class.

Methods

CreateExport()

Creates an instance of the factory's export type.

Applies to