dotnet/wpf · error · InvalidDataException

SR.ReachPackaging_MoreThanOneMetaDataParts

Error message

SR.ReachPackaging_MoreThanOneMetaDataParts

What it means

When opening an XPS package, XpsManager scans package relationships of type CorePropertiesRelationshipType to find the single CoreDocumentProperties part. If more than one such relationship exists, InvalidDataException(SR.ReachPackaging_MoreThanOneMetaDataParts) is thrown because the OPC/XPS spec permits at most one core properties part per package.

Solutions

Open the package as a ZIP/OpcPackage and delete the duplicate core-properties relationships so only one remains.
Regenerate the XPS file with a conformant producer.
If you own the writing code, ensure the previous core-properties relationship is removed before adding a new one.

Defensive patterns

Strategy: try-catch

Try / catch

catch (InvalidDataException) { /* package has duplicate core-properties relationships: repair or reject the file */ }

Prevention

Never add a core-properties relationship without removing an existing one.
Validate third-party-produced packages before processing.
Don't hand-edit package ZIP structures.

When it happens

Trigger: Opening a package whose root contains two or more package-level relationships of the core-properties relationship type — usually the result of a corrupted or hand-edited package, or a tool that appended metadata without removing the old relationship.

Common situations: Third-party tools producing invalid XPS/OPC packages; merging packages and keeping both metadata relationships; manually editing the package ZIP and duplicating core properties entries.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/b437b31f5bf18f1b. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/ReachFramework/Packaging/XpsManager.cs:1250

            //
            if (!_contentTypes.ContainsKey(key))
            {
                _contentTypes[key] = 1;
            }

            return key;
        }

        private
        PackageRelationship
        GetDocumentPropertiesReationship()
        {
            PackageRelationship propertiesPartRelationship = null;
            foreach (PackageRelationship rel in _metroPackage.GetRelationshipsByType(XpsS0Markup.CorePropertiesRelationshipType))
            {
                if (propertiesPartRelationship != null)
                {
                    throw new InvalidDataException(SR.ReachPackaging_MoreThanOneMetaDataParts);
                }

                propertiesPartRelationship = rel;
            }
            return propertiesPartRelationship;
        }

        private
        void
        AddPackageToCache(Uri uri, Package package )
        {
            lock (_globalLock)
            {
                _packageCache[uri] = 1;
            }
            PackageStore.AddPackage( uri, package );
        }

View on GitHub (pinned to 81131a70a4)