I am looking for a .NET library that is able to decode data from a PDF-417 barcode that is embedded either in an image file or PDF. At this point, I have only been able to
We use components (not free) from IDAutomation for PDF417. They are very good. We use them for encoding, as opposed to reading and decoding.
Haven't used this component of theirs, but have a look it is C#, and you can obtain the source code, but again, not free.
http://www.idautomation.com/barcode-recognition/