Program.cs

using System.Xml.Linq;
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;
using iText.Kernel.Font;
using iText.IO.Font.Constants;
using System.Dynamic;
using System.Text.Json;

namespace KSeF_PDF_Generator
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length == 0)
            {
                Console.WriteLine("Usage: KsefInvoiceConverter <xml-file> [output-pdf]");
                return;
            }

            var xmlFile = args[0];
            var outputFile = args.Length > 1 ? args[1] : Path.ChangeExtension(xmlFile, ".pdf");
            var nrKSeF = args.Length > 2 ? args[2] : null;
            var ksefHash = args.Length > 3 ? args[3] : null;

            try
            {
                var xmlStr = File.ReadAllText(xmlFile);
                var pdfBytes = KsefInvoiceGenerator.GenerateInvoiceFromString(xmlStr, nrKSeF, ksefHash: ksefHash);
                File.WriteAllBytes(outputFile, pdfBytes);
                Console.WriteLine($"PDF generated: {outputFile} ({pdfBytes.Length} bytes)");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex}");
            }
        }
    }
}