Q: Is there any sample project demonstrate how to output the PDFDoc
into byte array rather than saving to a physical file?
If no such example/method, output to a .NET output stream would also
be fine to me.
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A: You may want to take a look at PDFDocMemory sample:
http://www.pdftron.com/pdfnet/samplecode.html#PDFDocMemory.
Basically PDFDoc constructor and Save methods can also accept a memory
buffer which you can pass instead of filename.