iTextSharp：如何将页面编号合并到多个pdf文件后添加到多个pdf文件中

Question

我在Windows窗体应用程序中使用了版本5.5.8.0的iTextSharp。这是我用来合并两个pdf文件的代码。我的任务是在合并文件中添加页码。

private void MergePDFFiles()
{
    string fileSuffix = DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf";

    string[] lstFiles = new string[2];
    lstFiles[0] = @"/File_1.pdf";
    lstFiles[1] = @"/File_2.pdf";

    PdfReader reader = null;
    Document sourceDocument = null;
    PdfCopy pdfCopyProvider = null;
    PdfImportedPage importedPage;
    string outputPdfPath = @"/MergedPageNo_" + fileSuffix;

    sourceDocument = new Document();
    pdfCopyProvider = new PdfCopy(sourceDocument, new System.IO.FileStream(outputPdfPath, System.IO.FileMode.Create));

    sourceDocument.Open();

    try
    {
        for (int f = 0; f < lstFiles.Length - 0; f++)
        {
            int pages = get_pageCount(lstFiles[f]);

            reader = new PdfReader(lstFiles[f]);
            for (int i = 1; i <= pages; i++)
            {                      
                importedPage = pdfCopyProvider.GetImportedPage(reader, i);
                pdfCopyProvider.AddPage(importedPage);
            }

            reader.Close();
        }
        sourceDocument.Close();
    }
    catch (Exception ex)
    {
        throw ex;
    }
}`