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Import form data into PDF

Merge Form Data File (FDF) to PDF Forms in .NET Core

To import XFDF into FDF, then merge data from FDF into PDF

// Import annotations from XFDF to FDF
FDFDoc fdf_doc = new FDFDoc(FDFDoc.CreateFromXFDF(xfdf_filename));

// Optionally read XFDF from a string
FDFDoc fdf_doc = new FDFDoc(FDFDoc.CreateFromXFDF(xfdf_string));

// Merge FDF data into PDF doc
PDFDoc doc = new PDFDoc(filename);
doc.FDFMerge(fdf_doc);

PDF Form fill and form data extraction
Full sample code which illustrates basic FDF merge/extract functionality and full support for FDF (Forms Data Format)

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