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PackUriHelper.ResolvePartUri Method

Returns a part URI given a source part URI and a URI with a relative path to a target part.

Namespace:  System.IO.Packaging
Assembly:  WindowsBase (in WindowsBase.dll)

public static Uri ResolvePartUri(
	Uri sourcePartUri,
	Uri targetUri
)

Parameters

sourcePartUri
Type: System.Uri

The URI of the source part, or "/" to designate the Package root.

targetUri
Type: System.Uri

The relative URI to the target part.

Return Value

Type: System.Uri
The URI of the target part resolved between the specified SourcePartUri and the targetUri parameters.

ExceptionCondition
ArgumentNullException

sourcePartUri or targetUri is null.

ArgumentException

sourcePartUri is not a valid part URI.

-or-

targetUri is not a valid relative URI.

The following table illustrates sample cases for ResolvePartUri.

 sourcePartUri

 targetUri

 Returned URI 

 /mydoc/markup/page.xml 

 picture.jpg 

 /mydoc/markup/picture.jpg 

 /mydoc/markup/page.xml 

 images/picture.jpg 

 /mydoc/markup/images/picture.jpg 

 /mydoc/markup/page.xml 

 ./picture.jpg 

 /mydoc/markup/picture.jpg 

 /mydoc/markup/page.xml 

 ../picture.jpg 

 /mydoc/picture.jpg 

 /mydoc/markup/page.xml 

 ../images/picture.jpg 

 /mydoc/images/picture.jpg 

 / 

 images/picture.jpg 

 /images/picture.jpg 

The following example shows how to use the ResolvePartUri method. For the complete sample, see Reading a Package Sample.

// 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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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