Complete code
using System;
using System.IO;
using SautinSoft;
using SautinSoft.Pdf;
using SautinSoft.Pdf.Content;
namespace Sample
{
class Sample
{
/// <summary>
/// Export form fields data to fdf/xfdf/json document.
/// </summary>
/// <remarks>
/// Details: https://sautinsoft.com/products/pdf/help/net/developer-guide/export-interactive-forms.php
/// </remarks>
static void Main(string[] args)
{
// Before starting this example, please get a free 30-day trial key:
// https://sautinsoft.com/start-for-free/
// Apply the key here:
// PdfDocument.SetLicense("...");
string pdfFile = Path.GetFullPath(@"..\..\..\FormFilled.pdf");
using (var document = PdfDocument.Load(pdfFile))
{
//Export form data as fdf stream.
var fdfFile = new FileStream("fdfOut.fdf", FileMode.Create);
document.Form.ExportData(fdfFile, SautinSoft.Pdf.Forms.PdfFormDataFormat.FDF);
//Export form data to xfdf file.
document.Form.ExportData("xfdfOut.xfdf");
//Export form data to json file.
document.Form.ExportData("jsonOut.json");
}
}
}
}
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