IncludeAttribute Class

Artigo
01/27/2012

[WCF RIA Services Version 1 Service Pack 2 is compatible with either .NET framework 4 or .NET Framework 4.5, and with either Silverlight 4 or Silverlight 5.]

Specifies that the association should be part of any code-generated client entities.

Inheritance Hierarchy

System.Object
System.Attribute
System.ServiceModel.DomainServices.Server.IncludeAttribute

Namespace: System.ServiceModel.DomainServices.Server
Assembly: System.ServiceModel.DomainServices.Server (in System.ServiceModel.DomainServices.Server.dll)

Syntax

'Declaration
<AttributeUsageAttribute(AttributeTargets.Property Or AttributeTargets.Field, AllowMultiple := True,  _
    Inherited := True)> _
Public NotInheritable Class IncludeAttribute _
    Inherits Attribute

'Usage
Dim instance As IncludeAttribute

[AttributeUsageAttribute(AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = true, 
    Inherited = true)]
public sealed class IncludeAttribute : Attribute

[AttributeUsageAttribute(AttributeTargets::Property|AttributeTargets::Field, AllowMultiple = true, 
    Inherited = true)]
public ref class IncludeAttribute sealed : public Attribute

[<SealedAttribute>]
[<AttributeUsageAttribute(AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = true, 
    Inherited = true)>]
type IncludeAttribute =  
    class
        inherit Attribute
    end

public final class IncludeAttribute extends Attribute

The IncludeAttribute type exposes the following members.

Constructors

	Name	Description
	IncludeAttribute()	Initializes a new instance of the IncludeAttribute class.
	IncludeAttribute(String, String)	Initializes a new instance of the IncludeAttribute class with the specified member projection.

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Properties

	Name	Description
	IsProjection	Gets a value that indicates whether this attribute specifies a member projection.
	MemberName	Gets the name of the destination member for the projection.
	Path	Gets the member projection path.
	TypeId	Gets a unique identifier for this attribute. (Overrides Attribute.TypeId.)

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Methods

	Name	Description
	Equals	(Inherited from Attribute.)
	Finalize	(Inherited from Object.)
	GetHashCode	(Inherited from Attribute.)
	GetType	(Inherited from Object.)
	IsDefaultAttribute	(Inherited from Attribute.)
	Match	(Inherited from Attribute.)
	MemberwiseClone	(Inherited from Object.)
	ToString	(Inherited from Object.)

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Explicit Interface Implementations

	Name	Description
	_Attribute.GetIDsOfNames	(Inherited from Attribute.)
	_Attribute.GetTypeInfo	(Inherited from Attribute.)
	_Attribute.GetTypeInfoCount	(Inherited from Attribute.)
	_Attribute.Invoke	(Inherited from Attribute.)

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Remarks

When applied to an entity association, this attribute specifies that the association should be part of any code-generated client entities, and that any related entities should be included when serializing results to the client. In the query method, you must ensure that the associated entities are actually loaded by using the Include method on the query. This attribute can also be used to specify member projections.

Examples

The following example shows the IncludeAttribute attribute applied to a member that is part of a hierarchy.

<MetadataTypeAttribute(GetType(SalesOrderHeader.SalesOrderHeaderMetadata))>  _
Partial Public Class SalesOrderHeader

    Friend NotInheritable Class SalesOrderHeaderMetadata

        Private Sub New()
            MyBase.New
        End Sub

        <Include()> _
        <Composition()> _
        Public SalesOrderDetails As EntityCollection(Of SalesOrderDetail)

    End Class
End Class

[MetadataTypeAttribute(typeof(SalesOrderHeader.SalesOrderHeaderMetadata))]
public partial class SalesOrderHeader
{
    internal sealed class SalesOrderHeaderMetadata
    {
        private SalesOrderHeaderMetadata()
        {
        }

        [Include]
        [Composition]
        public EntitySet<SalesOrderDetail> SalesOrderDetails;

    }
}

The following example shows how to include the results in the query.

Public Function GetSalesOrders() As IQueryable(Of SalesOrderHeader)
    Return Me.ObjectContext.SalesOrderHeaders.Include("SalesOrderDetails")
End Function

public IQueryable<SalesOrderHeader> GetSalesOrders()
{
    return this.ObjectContext.SalesOrderHeaders.Include("SalesOrderDetails");
}

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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