dotnet/wpf · error · XpsPackagingException

ReachPackaging_NotOpenForReading

Error message

ReachPackaging_NotOpenForReading

What it means

GetFixedDocumentSequence throws this XpsPackagingException when the XpsDocument was not opened for reading (IsReader is false — e.g. opened write-only or for creation). Reading the root fixed document sequence requires read access to the package.

Solutions

1. Open the XpsDocument with access mode that allows reading (or FileAccess.Read / ReadWrite) instead of write-only
2. Open a new XpsDocument instance with read access to consume the content

When it happens

Trigger: Thrown at src/Microsoft.DotNet.Wpf/src/ReachFramework/Packaging/XpsDocument.cs:589 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/88362856c514f14e. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/ReachFramework/Packaging/XpsDocument.cs:589

        /// <returns>A XpsPartBase representing the root.</returns>
        /// <remarks>Method will be internal until reading/de-serialization is implemented.</remarks>
        /// <exception cref="SR.ReachPackaging_PackageUriNull">XpsPakage Uri is null.  Use XpsDocument constructor that takes Uri parameter.</exception>
        /// <exception cref="SR.ReachPackaging_InvalidStartingPart">Package starting part is not a valid root.</exception>
        /// <exception cref="SR.ReachPackaging_NotAFixedDocumentSequence">Part Uri does not corresepond to  a Fixed Document Sequence.</exception>
        public
        FixedDocumentSequence
        GetFixedDocumentSequence(
            )
        {
            CheckDisposed();
        
            if( CurrentXpsManager == null )
            {
                throw new InvalidOperationException(SR.ReachPackaging_DocumentWasClosed);
            }
            if (!IsReader)
            {
                throw new XpsPackagingException(SR.ReachPackaging_NotOpenForReading);
            }

            if (null == Uri)
            {
                throw new XpsPackagingException(SR.ReachPackaging_PackageUriNull);
            }

            if (CurrentXpsManager.StartingPart == null)
            {
                return null;
            }

            ContentType startPartType = CurrentXpsManager.StartingPart.ValidatedContentType();
            if (!startPartType.AreTypeAndSubTypeEqual(XpsS0Markup.DocumentSequenceContentType))
            {
                 throw new XpsPackagingException(SR.ReachPackaging_InvalidStartingPart);
            }
            ParserContext parserContext = new ParserContext

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