多个页面上的C＃itextsharp表

Question

我正在尝试在多个页面中添加一个表格，但PDF的其余部分保持不变。这是送货单。只是想知道我做错了什么，我猜它是PdfCopy没有它，AcroFields工作。感谢。

string templateFile = @"c:\DeliveryNote.pdf";

using (Document doc = new Document())
{
    using (MemoryStream ms = new MemoryStream())
    {
        using (PdfReader pdfReader = new PdfReader(templateFile))
        {
            using (PdfStamper pdfStamper = new PdfStamper(pdfReader, ms, '\0', true))
            {
                pdfStamper.Writer.CloseStream = false;

                AcroFields pdfFormFields = pdfStamper.AcroFields;

                pdfFormFields.SetField("CompanyName", "Test Limited");
                pdfFormFields.SetField("CompanyTelephoneNumber", "Test Limited");
                pdfFormFields.SetField("CompanyFaxNumber", "+44");

                Rectangle rect = pdfFormFields.GetFieldPositions("ItemTable")[0].position;
                ColumnText column = new ColumnText(pdfStamper.GetOverContent(1));
                column.SetSimpleColumn(rect);

                PdfPTable table = new PdfPTable(3);
                table.AddCell("Qty");
                table.AddCell("Product Code");
                table.AddCell("Description");

                for (int i = 0; i < 100; i++)
                {
                    table.AddCell($"Value {i}");
                    table.AddCell($"Value {i}");
                    table.AddCell($"Value {i}");
                }

                column.AddElement(table);

                while (true)
                {
                    column.SetSimpleColumn(rect);
                    if (!ColumnText.HasMoreText(column.Go()))
                        break;

                    PdfCopy copy = new PdfCopy(doc, ms);
                    copy.CloseStream = false;
                    doc.Open();
                    copy.SetMergeFields();
                    copy.AddDocument(new PdfReader(templateFile));
                }
            }
        }

        doc.Close();

        File.WriteAllBytes(@"C:\Temp\Lol.pdf", ms.ToArray());
        Process.Start(@"C:\Temp\Lol.pdf");
    }
}

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