iTextSharp.text.pdf.AcroFields.GetAppearanceStates C# (CSharp) Метод

        public String[] GetAppearanceStates(String fieldName) {
            Item fd = (Item)fields[fieldName];
            if (fd == null)
                return null;
            Hashtable names = new Hashtable();
            PdfDictionary vals = fd.GetValue(0);
            PdfString stringOpt = vals.GetAsString( PdfName.OPT );
            if (stringOpt != null) {
                names[stringOpt.ToUnicodeString()] = null;
            }
            else {
                PdfArray arrayOpt = vals.GetAsArray(PdfName.OPT);
                if (arrayOpt != null) {
                    for (int k = 0; k < arrayOpt.Size; ++k) {
                        PdfString valStr = arrayOpt.GetAsString( k );
                        if (valStr != null)
                            names[valStr.ToUnicodeString()] = null;
                    }
                }
            }
            for (int k = 0; k < fd.Size; ++k) {
                PdfDictionary dic = fd.GetWidget( k );
                dic = dic.GetAsDict(PdfName.AP);
                if (dic == null)
                    continue;
                dic = dic.GetAsDict(PdfName.N);
                if (dic == null)
                    continue;
            foreach (PdfName pname in dic.Keys) {
                    String name = PdfName.DecodeName(pname.ToString());
                    names[name] = null;
                }
            }
            string[] outs = new string[names.Count];
            names.Keys.CopyTo(outs, 0);
            return outs;
        }