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How to manage memory while merging large PDF documents?

Setting the EnableMemoryOptimization property of the PdfLoadedDocument to true reduces the memory usage when its instance is closed. To achieve this, create a PdfDocument, then import the pages and contents of the loaded documents to the PdfDocument, and dispose the loaded document. Finally, save the PdfDocument’s instance and close the same.

C#

Sample Link:

http://www.syncfusion.com/downloads/support/directtrac/general/MemoryOptimize-1342350512.zip

Article ID: Published Date: Last Revised Date: Platform: Control:
4632 04/21/2015 04/21/2015 WinForms PDF
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Comments
Andrew Williams Jan 09, 2017
I'm getting an "Object reference not set to an instance of an object" exception when I use this method with streams instead of file paths. Everything works until I go to save the document. The code doesn't crash if I take out "loadedDocument.Close(true);".

at Syncfusion.Pdf.Primitives.PdfReferenceHolder.get_Index()
   at Syncfusion.Pdf.Primitives.PdfReferenceHolder.GetObject()
   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.PdfStream.Save(IPdfWriter writer)
   at Syncfusion.Pdf.IO.PdfCrossTable.DoSaveObject(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.Parsing.PdfLoadedDocument.AppendDocument(PdfWriter writer)
   at Syncfusion.Pdf.Parsing.PdfLoadedDocument.Save(Stream stream)
Reply
Andrew Williams Jan 09, 2017
Figured out what I was doing wrong, make sure you Enable Memory Optimization on the Document as well as the loadedDocuments. I forgot to do the former, which I guess leaves behind some references to the pdfs that are loaded into it.
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