dotnet/wpf · error · XpsSerializationException

SR.ReachSerialization_NoFixedPageWriter

Error message

SR.ReachSerialization_NoFixedPageWriter

What it means

AcquireResourceStreamForXpsFont requires an open fixed-page writer to attach the new font part to. If the font is not cached and _currentFixedPageXmlWriter is null (no page is open), XpsSerializationException(SR.ReachSerialization_NoFixedPageWriter) is thrown because a font part cannot be created without page context.

Solutions

1. Only call AcquireResourceStreamForXpsFont while a FixedPage is open (between AcquireXmlWriterForFixedPage and ReleaseXmlWriterForFixedPage).
2. Acquire the page writer first in your serialization order.
3. If the policy was invalidated by a cancel, start a new print job rather than reusing it.

Example fix

// before
var s = policy.AcquireResourceStreamForXpsFont(id); // throws: no page open
// after
policy.AcquireXmlWriterForFixedPage();
var s = policy.AcquireResourceStreamForXpsFont(id);
... write font ...
policy.ReleaseResourceStreamForXpsFont(id);
policy.ReleaseXmlWriterForFixedPage();

if (!pageOpen) throw new InvalidOperationException("AcquireXmlWriterForFixedPage must be called before AcquireResourceStreamForXpsFont");

static bool CanAcquireFont(bool pageOpen) => pageOpen;

try { var s = policy.AcquireResourceStreamForXpsFont(id); }
catch (XpsSerializationException ex) { log("Font stream requested with no open FixedPage", ex); }

When it happens

Trigger: Requesting a font resource stream (new resourceId not in _fontsCache) before AcquireXmlWriterForFixedPage or after ReleaseXmlWriterForFixedPage; acquiring fonts outside page scope.

Common situations: Custom serialization acquiring font streams in the wrong phase; continuing to fetch fonts after a page was released; reusing the policy after invalidation reset the page writer.

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

• Count must be 1 when CommitPolicies is set to…
• CurrentFixedPageWriter uninitialized
• FixedPageReader
• No font service is registered with resource policy.
• Serialization of this type of object is not supported.

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/411264f79413b163. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/ReachFramework/Serialization/manager/XpsOMPackagingPolicy.cs:482

                        IXpsOMFontResourceCollection fontCollection = _xpsPartResources.GetFontResources();
                        fontCollection.Append(fontResource);

                        XpsResourceStream fontResourceStream = new XpsResourceStream(fontStreamWrapper, uri);
                        resourceStreamCacheItem.XpsResourceStream = fontResourceStream;

                        _fontsCache[resourceId] = resourceStreamCacheItem;

                        resourceStream = fontResourceStream;
                    }
                    catch (COMException)
                    {
                        Invalidate();
                        throw new PrintingCanceledException();
                    }
                }
                else
                {
                    throw new XpsSerializationException(SR.ReachSerialization_NoFixedPageWriter);
                }
            }
            else
            {
                resourceStream = resourceStreamCacheItem.XpsResourceStream;
                resourceStreamCacheItem.IncRef();
            }

            return resourceStream;
        }

        /// <summary>
        /// This is never called during printing, but we must implement it from
        /// abstract class BasePackagingPolicy
        /// </summary>
        public
        override
        void

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