iTextSharp.text.RomanList.Add C# (CSharp) Метод

        public override bool Add(IElement o)
        {
            if (o is ListItem) {
                ListItem item = (ListItem) o;
                Chunk chunk = new Chunk(preSymbol, symbol.Font);
                chunk.Attributes = symbol.Attributes;
                chunk.Append(RomanNumberFactory.GetString(first + list.Count, lowercase));
                chunk.Append(postSymbol);
                item.ListSymbol = chunk;
                item.SetIndentationLeft(symbolIndent, autoindent);
                item.IndentationRight = 0;
                list.Add(item);
                return true;
            } else if (o is List) {
                List nested = (List) o;
                nested.IndentationLeft = nested.IndentationLeft + symbolIndent;
                first--;
                list.Add(nested);
                return true;
            }
            return false;
        }

    public void NestedListAtTheEndOfAnotherNestedList() {
        String pdfFile = "nestedListAtTheEndOfAnotherNestedList.pdf";
        // step 1
        Document document = new Document();
        // step 2
        PdfWriter.GetInstance(document, File.Create(DEST_FOLDER + pdfFile));
        // step 3
        document.Open();
        // step 4
        PdfPTable table = new PdfPTable(1);
        PdfPCell cell = new PdfPCell();
        cell.BackgroundColor = BaseColor.ORANGE;

        RomanList romanlist = new RomanList(true, 20);
        romanlist.IndentationLeft = 10f;
        romanlist.Add("One");
        romanlist.Add("Two");
        romanlist.Add("Three");

        RomanList romanlist2 = new RomanList(true, 20);
        romanlist2.IndentationLeft = 10f;
        romanlist2.Add("One");
        romanlist2.Add("Two");
        romanlist2.Add("Three");

        romanlist.Add(romanlist2);
        //romanlist.add("Four");

        List list = new List(List.ORDERED, 20f);
        list.SetListSymbol("\u2022");
        list.IndentationLeft = 20f;
        list.Add("One");
        list.Add("Two");
        list.Add("Three");
        list.Add("Four");
        list.Add("Roman List");
        list.Add(romanlist);

        list.Add("Five");
        list.Add("Six");

        cell.AddElement(list);
        table.AddCell(cell);
        document.Add(table);
        // step 5
        document.Close();

        CompareTool compareTool = new CompareTool();
        String error = compareTool.CompareByContent(DEST_FOLDER + pdfFile, SOURCE_FOLDER + pdfFile, DEST_FOLDER, "diff_");
        if (error != null) {
            Assert.Fail(error);
        }
    }