Package.GetRelationshipsByType(String) Метод

Определение

Пространство имен:

System.IO.Packaging

Сборка:

System.IO.Packaging.dll

Пакет:

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

Исходный код:

Package.cs

Возвращает коллекцию, состоящую из всех связей уровня пакета с заданным типом 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

Параметры

relationshipType

String

Свойство RelationshipType для сопоставления и возврата в коллекцию.

Возвращаемое значение

PackageRelationshipCollection

Коллекция связей уровня пакета, соответствующих указанному типу relationshipType.

Исключения

ArgumentNullException

relationshipType имеет значение null.

ArgumentException

Параметр relationshipType равен пустой строке.

ObjectDisposedException

Пакет не открыт (вызван метод Dispose(Boolean) или Close()).

IOException

Пакет доступен только для записи.

Примеры

В следующем примере показано, как получить связи, определенные для пакета.

// 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.

Комментарии

GetRelationships никогда не возвращает ; nullоднако возвращаемая коллекция может содержать нулевые элементы, если нет связей на уровне пакета, соответствующих указанному relationshipType.

В следующей таблице показаны URI уровня relationshipType пакета, определенные спецификацией Open Packaging Conventions (OPC).

Отношение на уровне пакета	URI типа связи
Основные свойства	http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties
Цифровая подпись	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/signature
Сертификат цифровой подписи	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/certificate
Источник цифровой подписи	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/origin
Thumbnail	http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail

Дополнительные сведения см. в спецификации Open Packaging Conventions (OPC), доступной для скачивания по адресу https://www.ecma-international.org/publications-and-standards/standards/ecma-376/.

См. также раздел

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