Package.GetRelationshipsByType(String) Método

Definição

Namespace:

System.IO.Packaging

Assembly:

System.IO.Packaging.dll

Pacote:

System.IO.Packaging v9.0.0-rc.2.24473.5

Origem:

Package.cs

Retorna uma coleção de todas as relações de nível de pacote que correspondem a um determinado RelationshipType.

public:
 System::IO::Packaging::PackageRelationshipCollection ^ GetRelationshipsByType(System::String ^ relationshipType);

public System.IO.Packaging.PackageRelationshipCollection GetRelationshipsByType (string relationshipType);

member this.GetRelationshipsByType : string -> System.IO.Packaging.PackageRelationshipCollection

Public Function GetRelationshipsByType (relationshipType As String) As PackageRelationshipCollection

Parâmetros

relationshipType

String

O RelationshipType para corresponder e retornar na coleção.

Retornos

PackageRelationshipCollection

Uma coleção de relações de nível de pacote que correspondem ao relationshipType especificado.

Exceções

ArgumentNullException

relationshipType é null.

ArgumentException

relationshipType é uma cadeia de caracteres vazia.

ObjectDisposedException

O pacote não está aberto (Dispose(Boolean) ou Close() foi chamado).

IOException

O pacote é somente gravação.

Exemplos

O exemplo a seguir mostra como recuperar as relações que foram definidas para o pacote.

// Open the Package.
// ('using' statement insures that 'package' is
//  closed and disposed when it goes out of scope.)
using (Package package =
    Package.Open(packagePath, FileMode.Open, FileAccess.Read))
{
    PackagePart documentPart = null;
    PackagePart resourcePart = null;

    // Get the Package Relationships and look for
    //   the Document part based on the RelationshipType
    Uri uriDocumentTarget = null;
    foreach (PackageRelationship relationship in
        package.GetRelationshipsByType(PackageRelationshipType))
    {
        // Resolve the Relationship Target Uri
        //   so the Document Part can be retrieved.
        uriDocumentTarget = PackUriHelper.ResolvePartUri(
            new Uri("/", UriKind.Relative), relationship.TargetUri);

        // Open the Document Part, write the contents to a file.
        documentPart = package.GetPart(uriDocumentTarget);
        ExtractPart(documentPart, targetDirectory);
    }

    // Get the Document part's Relationships,
    //   and look for required resources.
    Uri uriResourceTarget = null;
    foreach (PackageRelationship relationship in
        documentPart.GetRelationshipsByType(
                                ResourceRelationshipType))
    {
        // Resolve the Relationship Target Uri
        //   so the Resource Part can be retrieved.
        uriResourceTarget = PackUriHelper.ResolvePartUri(
            documentPart.Uri, relationship.TargetUri);

        // Open the Resource Part and write the contents to a file.
        resourcePart = package.GetPart(uriResourceTarget);
        ExtractPart(resourcePart, targetDirectory);
    }
}// end:using(Package package) - Close & dispose package.

' Open the Package.
' ('using' statement insures that 'package' is
'  closed and disposed when it goes out of scope.)
Using package As Package = Package.Open(packagePath, FileMode.Open, FileAccess.Read)
    Dim documentPart As PackagePart = Nothing
    Dim resourcePart As PackagePart = Nothing

    ' Get the Package Relationships and look for
    '   the Document part based on the RelationshipType
    Dim uriDocumentTarget As Uri = Nothing
    For Each relationship As PackageRelationship In package.GetRelationshipsByType(PackageRelationshipType)
        ' Resolve the Relationship Target Uri
        '   so the Document Part can be retrieved.
        uriDocumentTarget = PackUriHelper.ResolvePartUri(New Uri("/", UriKind.Relative), relationship.TargetUri)

        ' Open the Document Part, write the contents to a file.
        documentPart = package.GetPart(uriDocumentTarget)
        ExtractPart(documentPart, targetDirectory)
    Next relationship

    ' Get the Document part's Relationships,
    '   and look for required resources.
    Dim uriResourceTarget As Uri = Nothing
    For Each relationship As PackageRelationship In documentPart.GetRelationshipsByType(ResourceRelationshipType)
        ' Resolve the Relationship Target Uri
        '   so the Resource Part can be retrieved.
        uriResourceTarget = PackUriHelper.ResolvePartUri(documentPart.Uri, relationship.TargetUri)

        ' Open the Resource Part and write the contents to a file.
        resourcePart = package.GetPart(uriResourceTarget)
        ExtractPart(resourcePart, targetDirectory)
    Next relationship

End Using ' end:using(Package package) - Close & dispose package.

Comentários

GetRelationships nunca retornará null; no entanto, a coleção retornada poderá conter zero elementos se não houver relações no nível do pacote que correspondam ao especificado relationshipType.

A tabela a seguir mostra os URIs de nível relationshipType de pacote definidos pela especificação OPC (Open Packaging Conventions).

Relação no nível do pacote	URI do Tipo de Relação
Propriedades principais	http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties
Assinatura digital	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/signature
Certificado de Assinatura Digital	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/certificate
Origem da Assinatura Digital	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/origin
Thumbnail	http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail

Para obter informações adicionais, consulte a especificação OPC (Open Packaging Conventions) disponível para download em https://www.ecma-international.org/publications-and-standards/standards/ecma-376/.

Confira também

• GetRelationship(String)
• GetRelationships()
• CreateRelationship(Uri, TargetMode, String)
• DeleteRelationship(String)