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c# - How do I enumerate all the fields in a PDF file in ITextSharp

Let's say I've loaded a PDF file using iTextSharp:

PdfStamper p = GetDocument();
AcroFields af = ps.AcroFields;

How do I get a list of all field names on the document from af?

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AcroFields af = ps.AcroFields;

        foreach (var field in af.Fields)
        {
            Console.WriteLine("{0}, {1}",
                field.Key,
                field.Value);
        }

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