Bagikan melalui

Package.GetPart(Uri) Metode

  • Referensi

Definisi

Ruang nama:
System.IO.Packaging
Rakitan:
System.IO.Packaging.dll
Rakitan:
WindowsBase.dll
Paket:
System.IO.Packaging v8.0.0
Paket:
System.IO.Packaging v9.0.0-preview.4.24266.19
Sumber:
Package.cs
Sumber:
Package.cs
Sumber:
Package.cs
Sumber:
Package.cs

Mengembalikan bagian dengan URI tertentu.

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

Parameter

partUri
Uri

Pengidentifikasi sumber daya seragam (URI) dari bagian yang akan dikembalikan.

Mengembalikan

PackagePart

Bagian dengan yang ditentukan partUri.

Pengecualian

ArgumentNullException

partUriadalah null.

ArgumentException

partUri bukan pengidentifikasi sumber daya seragam (URI) yang valid PackagePart .

InvalidOperationException

Bagian dengan yang ditentukan partUri tidak ada dalam paket.

ObjectDisposedException

Paket tidak terbuka (Dispose(Boolean) atau Close() telah dipanggil).

IOException

Paket ini hanya untuk menulis.

Contoh

Contoh berikut menunjukkan cara menemukan, mengambil, dan membaca bagian yang terkandung dalam paket.

// 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.

Keterangan

InvalidOperationException dilemparkan jika bagian dengan yang ditentukan partUri tidak ada.

Metode PartExists ini dapat digunakan untuk menentukan apakah partUri mereferensikan bagian yang ada.

Secara default, ZipPackage implementasi turunan dari kelas dasar abstrak Package disediakan dan digunakan. Dalam operasi default, GetPart secara internal memanggil GetPartCoreZipPackage kelas untuk mengembalikan bagian yang diminta dari file ZIP.

Untuk informasi tambahan, lihat spesifikasi Konvensi Kemasan Terbuka (OPC) yang tersedia untuk diunduh di https://www.ecma-international.org/publications-and-standards/standards/ecma-376/.

Catatan Bagi Inheritor

GetPart(Uri) secara internal memanggil metode kelas GetPartCore(Uri) turunan untuk benar-benar membersihkan bagian berdasarkan format fisik yang diterapkan di kelas turunan.

Berlaku untuk

Lihat juga