iTextSharp.text.pdf.PdfCopy.AddFieldResources C# (CSharp) Метод

        private void AddFieldResources(PdfDictionary catalog)
        {
            if (fieldArray == null)
                return;
            PdfDictionary acroForm = new PdfDictionary();
            catalog.Put(PdfName.ACROFORM, acroForm);
            acroForm.Put(PdfName.FIELDS, fieldArray);
            acroForm.Put(PdfName.DA, new PdfString("/Helv 0 Tf 0 g "));
            if (fieldTemplates.Count == 0)
                return;
            PdfDictionary dr = new PdfDictionary();
            acroForm.Put(PdfName.DR, dr);
            foreach (PdfTemplate template in fieldTemplates.Keys) {
                PdfFormField.MergeResources(dr, (PdfDictionary)template.Resources);
            }
            PdfDictionary fonts = dr.GetAsDict(PdfName.FONT);
            if (fonts == null) {
                fonts = new PdfDictionary();
                dr.Put(PdfName.FONT, fonts);
            }
            if (!fonts.Contains(PdfName.HELV)) {
                PdfDictionary dic = new PdfDictionary(PdfName.FONT);
                dic.Put(PdfName.BASEFONT, PdfName.HELVETICA);
                dic.Put(PdfName.ENCODING, PdfName.WIN_ANSI_ENCODING);
                dic.Put(PdfName.NAME, PdfName.HELV);
                dic.Put(PdfName.SUBTYPE, PdfName.TYPE1);
                fonts.Put(PdfName.HELV, AddToBody(dic).IndirectReference);
            }
            if (!fonts.Contains(PdfName.ZADB)) {
                PdfDictionary dic = new PdfDictionary(PdfName.FONT);
                dic.Put(PdfName.BASEFONT, PdfName.ZAPFDINGBATS);
                dic.Put(PdfName.NAME, PdfName.ZADB);
                dic.Put(PdfName.SUBTYPE, PdfName.TYPE1);
                fonts.Put(PdfName.ZADB, AddToBody(dic).IndirectReference);
            }
        }