ExportFactory<T> Class

Definition

Namespace:

System.ComponentModel.Composition

Assembly:

System.ComponentModel.Composition.dll

Package:

System.ComponentModel.Composition v9.0.0-rc.2.24473.5

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

generic <typename T>
public ref class ExportFactory

public class ExportFactory<T>

type ExportFactory<'T> = class

Public Class ExportFactory(Of 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:

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

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

<Export()>  
Public myData As String = "Example Data."  

<Import()>  
Public Property theData As ExportFactory(Of String)  

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.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)