iTextSharp:复制最后一页再创建一页

Question

我有一个PDF文件，每页都有页眉、页脚等。如果文本很长(我有可变文本(，我需要扩展页数。例如：

if (countOfRecords > 120)
{
// add one more page like second page of template (which does not have content, only header/footer
}

有可能吗？

Answer 1

我通过以下方式实现了它：创建带有"空"页面的PDF文件(意味着只有必要的页眉/页脚(，然后在必要时将其添加到主PDF中，必要时添加多少次：

PdfReader pdfReader = new PdfReader(model.Input);
Document document = new Document(pdfReader.GetPageSizeWithRotation(1));
using (MemoryStream ms = new MemoryStream())
{
PdfWriter writer = PdfWriter.GetInstance(document, ms);
document.Open();
PdfContentByte cb = writer.DirectContent;
PdfImportedPage page = writer.GetImportedPage(pdfReader, 1);
cb.AddTemplate(page, 0, 0);
int countOfPages = (int)Math.Ceiling(Convert.ToDecimal(model.ActiveDriverList.Count - countDriversOnFirstPage) / countDriversOnEmptyPage);

for (int i = 0; i < countOfPages; i++)
{
PdfReader readerPage = new PdfReader(model.EmptyPage);
readerPage.ConsolidateNamedDestinations();
document.SetPageSize(pdfReader.GetPageSizeWithRotation(1));
document.NewPage();
PdfImportedPage importedPage = writer.GetImportedPage(readerPage, 1);
cb = AddTextDriversNextPage(cb, model.ActiveDriverList, i + 1);
cb.AddTemplate(importedPage, 0, 0);
}
document.Close();
writer.Close();
return ms.ToArray();
}