What causes "PrintTicket was already committed." in dotnet/wpf?

Assign the PrintTicket before committing the document sequence.

dotnet/wpf · error · XpsPackagingException

PrintTicket was already committed.

Error message

PrintTicket was already committed.

What it means

The PrintTicket setter of XpsFixedDocumentSequenceReaderWriter throws XpsPackagingException (ReachPackaging_PrintTicketAlreadyCommitted) when a non-null ticket is assigned after the print ticket was already committed to the package. Once committed, the sequence-level ticket part is sealed and cannot be replaced via this property.

Solutions

Assign the PrintTicket before committing the document sequence.
If settings changed after commit, recreate the XpsFixedDocumentSequenceWriter/package with the new ticket.
Collect all job print settings up front, set once, then commit.

Example fix

// before
seq.PrintTicket = ticket;
seq.CommitContent();
seq.PrintTicket = newTicket; // throws
// after
seq.PrintTicket = newTicket;
seq.CommitContent();

Defensive patterns

Strategy: validation

Validate before calling

if (seqTicketSet && seqCommitted) throw new Exception("PrintTicket already committed; recreate the sequence writer.");

Try / catch

try { seq.PrintTicket = newTicket; }
catch (XpsPackagingException) { /* ticket committed: recreate package/sequence writer */ }

Prevention

Set sequence PrintTicket before CommitContent.
Never reuse committed sequence writers.
Freeze print options before starting generation.

When it happens

Trigger: Setting PrintTicket on XpsFixedDocumentSequenceReaderWriter after CommitContent/Commit wrote the sequence's ticket part.

Common situations: Document-sequence-level print settings applied after generation began; reusing one sequence writer for multiple jobs; late user changes to print options in a batch pipeline.

Understand the failure class

Background: "Invalid state transition" errors: "status must be X, actually Y", "already rejected/charging/uninstalled", "cannot ... while running" — what they mean when a library rejects your call — this error's family across 31 libraries.

Related errors

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/d1a58b8db5b42559. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/ReachFramework/Packaging/XpsFixedDocumentSequenceReaderWriter.cs:240

        /// <exception cref="SR.ReachPackaging_PrintTicketAlreadyCommitted">PrintTicket has already been committed.</exception>
        /// <exception cref="SR.ReachPackaging_NotAPrintTicket">Property is not a valid PrintTicket instance.</exception>
        public PrintTicket PrintTicket
        {
            get
            {
                if( _printTicket == null )
                {
                    _printTicket = CurrentXpsManager.EnsurePrintTicket(Uri);
                }
                return _printTicket;
            }
            set
            {
                if(value != null)
                {
                    if (_isPrintTicketCommitted)
                    {
                        throw new XpsPackagingException(SR.ReachPackaging_PrintTicketAlreadyCommitted);
                    }
                    if (!value.GetType().Equals(typeof(PrintTicket)))
                    {
                        throw new XpsPackagingException(SR.ReachPackaging_NotAPrintTicket);
                    }
                    _printTicket = value.Clone();
                }
                else
                {
                    _printTicket = null;
                }
            }
        }

        /// <summary>
        /// Gets a collection of all fixed documents that are contained within
        /// this document sequence.
        /// </summary>

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