iTextSharp.text.pdf.PdfAcroForm.IsValid C# (CSharp) Метод

        public bool IsValid()
        {
            if (documentFields.Size == 0) return false;
            Put(PdfName.FIELDS, documentFields);
            if (sigFlags != 0)
            Put(PdfName.SIGFLAGS, new PdfNumber(sigFlags));
            if (calculationOrder.Size > 0)
            Put(PdfName.CO, calculationOrder);
            if (fieldTemplates.Count == 0) return true;
            PdfDictionary dic = new PdfDictionary();
            foreach (PdfTemplate template in fieldTemplates.Keys) {
            PdfFormField.MergeResources(dic, (PdfDictionary)template.Resources);
            }
            Put(PdfName.DR, dic);
            Put(PdfName.DA, new PdfString("/Helv 0 Tf 0 g "));
            PdfDictionary fonts = (PdfDictionary)dic.Get(PdfName.FONT);
            if (fonts != null) {
            writer.EliminateFontSubset(fonts);
            }
            return true;
        }