Статья
11/17/2011

ImportDefinition Constructor (Expression<Func<ExportDefinition, Boolean>>, String, ImportCardinality, Boolean, Boolean)

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Initializes a new instance of the ImportDefinition class with the specified constraint, contract name, cardinality, a value that indicates whether the import definition is recomposable, and a value that indicates whether the import definition is a prerequisite.

Namespace: System.ComponentModel.Composition.Primitives
Assembly: System.ComponentModel.Composition (in System.ComponentModel.Composition.dll)

Syntax

'Declaration
Public Sub New ( _
    constraint As Expression(Of Func(Of ExportDefinition, Boolean)), _
    contractName As String, _
    cardinality As ImportCardinality, _
    isRecomposable As Boolean, _
    isPrerequisite As Boolean _
)

public ImportDefinition(
    Expression<Func<ExportDefinition, bool>> constraint,
    string contractName,
    ImportCardinality cardinality,
    bool isRecomposable,
    bool isPrerequisite
)

Parameters

constraint
Type: System.Linq.Expressions.Expression<Func<ExportDefinition, Boolean>>
An expression that contains a Func<T, TResult> object that defines the conditions an Export must match to satisfy the ImportDefinition.

contractName
Type: System.String
The contract name.

cardinality
Type: System.ComponentModel.Composition.Primitives.ImportCardinality
One of the enumeration values that indicates the cardinality of the Export objects required by the ImportDefinition.

isRecomposable
Type: System.Boolean
true to specify that the ImportDefinition can be satisfied multiple times throughout the lifetime of a ComposablePart object; otherwise, false.

isPrerequisite
Type: System.Boolean
true to specify that the ImportDefinition must be satisfied before a ComposablePart can start producing exported objects; otherwise, false.

Exceptions

Exception	Condition
ArgumentNullException	constraint is nulla null reference (Nothing in Visual Basic).
ArgumentException	cardinality is not one of the values of ImportCardinality.

Version Information

Silverlight

Supported in: 5, 4

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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