Package.GetRelationshipsByType(String) Méthode

Définition

Espace de noms:

System.IO.Packaging

Assembly:

System.IO.Packaging.dll

Paquet:

System.IO.Packaging v8.0.0

Source:

Package.cs

Retourne une collection de toutes les relations au niveau du package correspondant à un RelationshipType donné.

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

Paramètres

relationshipType

String

RelationshipType à faire correspondre et à retourner dans la collection.

Retours

PackageRelationshipCollection

Collection de relations au niveau du package correspondant au relationshipTypespécifié.

Exceptions

ArgumentNullException

relationshipType a la valeur null.

ArgumentException

relationshipType est une chaîne vide.

ObjectDisposedException

Le package n'est pas ouvert (Dispose(Boolean) ou Close() a été appelée).

IOException

Le package est en écriture seule.

Exemples

L’exemple suivant montre comment récupérer les relations qui ont été définies pour le package. Pour obtenir l’exemple complet, consultez Lecture d’un exemple de package.

// 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.

Remarques

GetRelationships ne retourne nulljamais ; toutefois, la collection retournée peut contenir zéro élément s’il n’existe aucune relation au niveau du package qui correspond au spécifié relationshipType.

Le tableau suivant présente les URI au niveau relationshipType du package définis par la spécification OPC (Open Packaging Conventions).

Relation au niveau du package	URI de type de relation
Propriétés principales	http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties
Signature numérique	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/signature
Certificat de signature numérique	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/certificate
Origine de la signature numérique	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/origin
Thumbnail	http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail

Pour plus d’informations, consultez la spécification Opc (Open Packaging Conventions) disponible en téléchargement à l’adresse https://www.ecma-international.org/publications-and-standards/standards/ecma-376/.

Voir aussi

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