Error When calling PdfDocument.Save()

[Aaron Knipe]

When saving a newly created pdf document I am getting a null reference exception.

Stack Trace:

at Syncfusion.Pdf.Primitives.PdfReferenceHolder.get_Index()

at Syncfusion.Pdf.Primitives.PdfReferenceHolder.ObtainObject()

at Syncfusion.Pdf.Primitives.PdfReferenceHolder.get_Object()

at Syncfusion.Pdf.Primitives.PdfReferenceHolder.Save(IPdfWriter writer)

at Syncfusion.Pdf.Primitives.PdfDictionary.SaveItems(IPdfWriter writer)

at Syncfusion.Pdf.Primitives.PdfDictionary.Save(IPdfWriter writer, Boolean bRaiseEvent)

at Syncfusion.Pdf.Primitives.PdfDictionary.Save(IPdfWriter writer)

at Syncfusion.Pdf.Primitives.PdfDictionary.SaveItems(IPdfWriter writer)

at Syncfusion.Pdf.Primitives.PdfDictionary.Save(IPdfWriter writer, Boolean bRaiseEvent)

at Syncfusion.Pdf.Primitives.PdfDictionary.Save(IPdfWriter writer)

at Syncfusion.Pdf.Primitives.PdfDictionary.SaveItems(IPdfWriter writer)

at Syncfusion.Pdf.Primitives.PdfDictionary.Save(IPdfWriter writer, Boolean bRaiseEvent)

at Syncfusion.Pdf.Primitives.PdfDictionary.Save(IPdfWriter writer)

at Syncfusion.Pdf.IO.PdfArchiveStream.SaveObject(IPdfPrimitive obj, PdfReference reference)

at Syncfusion.Pdf.IO.PdfCrossTable.DoArchiveObject(IPdfPrimitive obj, PdfReference reference, PdfWriter writer)

at Syncfusion.Pdf.IO.PdfCrossTable.SaveIndirectObject(IPdfPrimitive obj, PdfWriter writer)

at Syncfusion.Pdf.IO.PdfCrossTable.SaveObjects(PdfWriter writer)

at Syncfusion.Pdf.IO.PdfCrossTable.Save(PdfWriter writer)

at Syncfusion.Pdf.PdfDocument.Save(Stream stream)

at Syncfusion.Pdf.PdfDocumentBase.Save(String filename)

at .BusinessObjects.PDFMerge.FilesMerge(Int32 workOrderNumber, Int32 district, Int32 school, DateTime testBeginDate, Boolean IsPartial) in C:\\Users\\\\source\\repos\\RemoteDownload\\\\BusinessObjects\\PDFMerge.cs:line 78

at ..PDFMerge() in C:\\Users\\\\source\\repos\\RemoteDownload\\\\.cs:line 58

at ..Execute(TestScoreFile testScoreFile, BubbleFormWorkOrder workOrder) in C:\\Users\\\\source\\repos\\RemoteDownload\\\\.cs:line 35

at .Program.Main(String[] args) in C:\\Users\\\\source\\repos\\RemoteDownload\\\\Program.cs:line 31"

[Sowmiya Loganathan]

Hi Aaron, 

Thank you for contacting Syncfusion support.  

We have checked the mentioned issue with the provided stack trace. We suspect that this issue occurs due to disabling of “EnableMemoryOptimization” property. In older version by default we have perform merge function by clone each and every objects from existing PDF document and dispose it. But effective from product version 17.1.0.32, we did not process the above. The existing PDF document will dispose only after saving of merged PDF document. However you can overcome this by set true to “EnableMemoryOptimization” of PDF document. 

Please refer the below KB link for more details, 

https://www.syncfusion.com/kb/10374/best-practices-to-append-merge-and-import-pages-from-the-pdf  

Please try the above solution in your end and let us know if it solves the issue. If not please share us the PDF documents which you have used in your end. It will helpful for us to provide the precise solution on this.  

Regards, 

Sowmiya Loganathan 

[Aaron Knipe]

This solves my problem thank you!