共用方式為

Package.GetRelationshipsByType(String) 方法

  • 參考

定義

命名空間:
System.IO.Packaging
組件:
System.IO.Packaging.dll
組件:
WindowsBase.dll
套件:
System.IO.Packaging v8.0.1
套件:
System.IO.Packaging v9.0.0-rc.2.24473.5
來源:
Package.cs
來源:
Package.cs
來源:
Package.cs
來源:
Package.cs
來源:
Package.cs

傳回符合特定 RelationshipType 的所有套件層級關係的集合。

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

參數

relationshipType
String

要進行比對並傳回集合的 RelationshipType。

傳回

PackageRelationshipCollection

符合指定之 relationshipType 的套件層級關係的集合。

例外狀況

ArgumentNullException

relationshipType 為 null。

ArgumentException

relationshipType 為空字串。

ObjectDisposedException

套件沒有開啟 (已呼叫 Dispose(Boolean) 或 Close())。

IOException

封裝是唯寫的。

範例

下列範例示範如何擷取為封裝定義的關聯性。

// 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.

備註

GetRelationships 永遠不會傳回 null;不過，如果沒有符合指定 relationshipType之 的封裝層級關聯性，傳回的集合可能會包含零個專案。

下表顯示 Open Packaging Conventions (OPC) 規格所定義的套件層級 relationshipType URI。

套件層級關聯性 關聯性類型 URI
核心屬性 http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties
數位簽章 http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/signature
數字簽名憑證 http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/certificate
數位簽名來源 http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/origin
縮圖 http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail

如需詳細資訊，請參閱 open Packaging Conventions (OPC) specification for download at https://www.ecma-international.org/publications-and-standards/standards/ecma-376/。

適用於

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