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Syncfusion.Pdf memory leak.



We are using your Syncfusion.Pdf library and faced with a memory leak.


                      byte[] content = …;

byte[] xmlFormData = …;


                      using (var pdfInStream = new MemoryStream(content, false))

                      using (var pdfDocument = new PdfLoadedDocument(pdfInStream))

                      using (var xmlFormDataStream = new MemoryStream(xmlFormData))



                             pdfDocument.Form.Flatten = true;


                             using (var pdfDocumentStream = new MemoryStream())




                                    pdfDocumentStream.Seek(0, SeekOrigin.Begin);


                                    return pdfDocumentStream.ToArray();




After running this code multiple times memory fills with a big amount of objects that can’t be garbage collected:




Service gets bigger and bigger and eventually hangs.


The reason is the static s_cache variable in Syncfusion.Pdf.PdfDocument class, that stores all the references to this objects:



The problem exists in 14.3451.0.49 library version.

Can you please assist us with this?

1 Reply

PH Praveenkumar H Syncfusion Team October 6, 2016 12:36 PM UTC

Hi Dmitry, 

Thank you for using Syncfusion products, 

Can you please enable memory optimization in you code as given in the below code snippet, 

byte[] content = …; 
byte[] xmlFormData = …; 
using (var pdfInStream = new MemoryStream(content, false)) 
using (var pdfDocument = new PdfLoadedDocument(pdfInStream)) 
using (var xmlFormDataStream = new MemoryStream(xmlFormData)) 
pdfDocument.EnableMemoryOptimization = true; 
pdfDocument.Form.Flatten = true; 
using (var pdfDocumentStream = new MemoryStream()) 
pdfDocumentStream.Seek(0, SeekOrigin.Begin); 
return pdfDocumentStream.ToArray(); 
it will dispose all the resources when disposing the PdfLoadedDocument. 
Please try the above code snippet and let us know your result. 


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