iTextSharp.text.pdf.PdfNumberTree.ReadTree C# (CSharp) Метод

        public static Hashtable ReadTree(PdfDictionary dic) {
            Hashtable items = new Hashtable();
            if (dic != null)
                IterateItems(dic, items);
            return items;
        }
    }

        /**
         * Retrieves the page labels from a PDF as an array of {@link PdfPageLabelFormat} objects.
         * @param reader a PdfReader object that has the page labels you want to retrieve
         * @return  a PdfPageLabelEntry array, containing an entry for each format change
         * or <code>null</code> if no page labels are present
         */
        public static PdfPageLabelFormat[] GetPageLabelFormats(PdfReader reader)
        {
            PdfDictionary dict   = reader.Catalog;
            PdfDictionary labels = (PdfDictionary)PdfReader.GetPdfObjectRelease(dict.Get(PdfName.PAGELABELS));

            if (labels == null)
            {
                return(null);
            }
            Hashtable numberTree = PdfNumberTree.ReadTree(labels);

            int[] numbers = new int[numberTree.Count];
            numberTree.Keys.CopyTo(numbers, 0);
            Array.Sort(numbers);
            PdfPageLabelFormat[] formats = new PdfPageLabelFormat[numberTree.Count];
            String prefix;
            int    numberStyle;
            int    pagecount;

            for (int k = 0; k < numbers.Length; ++k)
            {
                int           key = numbers[k];
                PdfDictionary d   = (PdfDictionary)PdfReader.GetPdfObjectRelease((PdfObject)numberTree[key]);
                if (d.Contains(PdfName.ST))
                {
                    pagecount = ((PdfNumber)d.Get(PdfName.ST)).IntValue;
                }
                else
                {
                    pagecount = 1;
                }
                if (d.Contains(PdfName.P))
                {
                    prefix = ((PdfString)d.Get(PdfName.P)).ToUnicodeString();
                }
                else
                {
                    prefix = "";
                }
                if (d.Contains(PdfName.S))
                {
                    char type = ((PdfName)d.Get(PdfName.S)).ToString()[1];
                    switch (type)
                    {
                    case 'R': numberStyle = UPPERCASE_ROMAN_NUMERALS; break;

                    case 'r': numberStyle = LOWERCASE_ROMAN_NUMERALS; break;

                    case 'A': numberStyle = UPPERCASE_LETTERS; break;

                    case 'a': numberStyle = LOWERCASE_LETTERS; break;

                    default: numberStyle = DECIMAL_ARABIC_NUMERALS; break;
                    }
                }
                else
                {
                    numberStyle = EMPTY;
                }
                formats[k] = new PdfPageLabelFormat(key + 1, numberStyle, prefix, pagecount);
            }
            return(formats);
        }