Package.GetRelationshipsByType(String) Metoda

Definice

Obor názvů:

System.IO.Packaging

Sestavení:

System.IO.Packaging.dll

Balíček:

System.IO.Packaging v8.0.0

Zdroj:

Package.cs

Vrátí kolekci všech relací na úrovni balíčku, které odpovídají danému RelationshipTypeobjektu .

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

Hodnota RelationshipType , která se má shodovat a vracet v kolekci.

Návraty

PackageRelationshipCollection

Kolekce relací na úrovni balíčku, které odpovídají zadanému relationshipType.

Výjimky

ArgumentNullException

relationshipType je null.

ArgumentException

relationshipType je prázdný řetězec.

ObjectDisposedException

Balíček není otevřen (Dispose(Boolean) nebo Close() byl volána).

IOException

Balíček je jen pro zápis.

Příklady

Následující příklad ukazuje, jak načíst relace, které byly definovány pro balíček. Kompletní ukázku najdete v tématu Čtení ukázky balíčku.

// 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.

Poznámky

GetRelationships nebude nikdy vracet null. Vrácená kolekce však může obsahovat nula prvků, pokud neexistují žádné relace na úrovni balíčku, které odpovídají zadanému relationshipTypeobjektu .

Následující tabulka ukazuje identifikátory URI na úrovni relationshipType balíčku definované specifikací OPC (Open Packaging Conventions).

Vztah na úrovni balíčku	Identifikátor URI typu relace
Základní vlastnosti	http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties
Digitální podpis	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/signature
Certifikát digitálního podpisu	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/certificate
Původ digitálního podpisu	http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/origin
Miniaturu	http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail

Další informace najdete ve specifikaci OPC (Open Packaging Conventions), která je k dispozici ke stažení na adrese https://www.ecma-international.org/publications-and-standards/standards/ecma-376/.

Viz také

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