Package.GetRelationshipsByType(String) Metoda

Definicja

Przestrzeń nazw:

System.IO.Packaging

Zestaw:

System.IO.Packaging.dll

Zwraca kolekcję wszystkich relacji na poziomie pakietu, które pasują do danego RelationshipTypeelementu .

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

Parametry

relationshipType

String

Element RelationshipType do dopasowania i zwrócenia w kolekcji.

Zwraca

PackageRelationshipCollection

Kolekcja relacji na poziomie pakietu, które pasują do określonego relationshipTypeelementu .

Wyjątki

ArgumentNullException

relationshipType to null.

ArgumentException

relationshipType jest pustym ciągiem.

ObjectDisposedException

Pakiet nie jest otwarty (Dispose(Boolean) lub Close() został wywołany).

IOException

Pakiet jest tylko do zapisu.

Przykłady

W poniższym przykładzie pokazano, jak pobrać relacje zdefiniowane dla pakietu.

// 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.

Uwagi

GetRelationships nigdy nie zostanie zwrócona null; jednak zwrócona kolekcja może zawierać zero elementów, jeśli nie ma relacji na poziomie pakietu, które pasują do określonego relationshipTypeelementu .

W poniższej tabeli przedstawiono identyfikatory URI na poziomie relationshipType pakietu zdefiniowane przez specyfikację Open Packaging Conventions (OPC).

Relacja na poziomie pakietu	Identyfikator URI typu relacji
Właściwości podstawowe	http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties
Podpis cyfrowy	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/signature
Certyfikat podpisu cyfrowego	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/certificate
Pochodzenie podpisu cyfrowego	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/origin
Miniaturę	http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail

Aby uzyskać dodatkowe informacje, zobacz specyfikację Open Packaging Conventions (OPC) dostępną do pobrania pod adresem https://www.ecma-international.org/publications-and-standards/standards/ecma-376/.

Zobacz też

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