Package.GetPart(Uri) Método

public:
 System::IO::Packaging::PackagePart ^ GetPart(Uri ^ partUri);

public System.IO.Packaging.PackagePart GetPart(Uri partUri);

member this.GetPart : Uri -> System.IO.Packaging.PackagePart

Public Function GetPart (partUri As Uri) As PackagePart

Parâmetros

Devoluções

A parte com o especificado partUri.

Exceções

Exemplos

O exemplo seguinte mostra como localizar, recuperar e ler peças contidas num 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.

Observações

Um InvalidOperationException é lançado se uma parte com a especificada partUri não existir.

O PartExists método pode ser usado para determinar se partUri faz referência a uma peça existente.

Por defeito, é fornecida e utilizada uma ZipPackage implementação derivada da classe base abstrata Package . Na operação padrão, GetPart chama GetPartCore internamente a ZipPackage classe para devolver uma peça solicitada de um ficheiro ZIP.

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

Notas para Herdeiros

GetPart(Uri) internamente, chama o método da classe GetPartCore(Uri) derivada para realmente limpar a peça com base no formato físico implementado na classe derivada.

Ver também

• GetParts()
• PartExists(Uri)
• CreatePartUri(Uri)
• GetPartUri(Uri)
• ResolvePartUri(Uri, Uri)