问将两个b5大小pdf合并到单个法律页面

EN

    public static void somefunction(string oldFile,string oldFile1,string pathout)
    {
        // open the reader
        PdfReader reader = new PdfReader(oldFile);
        PdfReader reader1 = new PdfReader(oldFile1);
        Document document = new Document(PageSize.LEGAL.Rotate());

        // open the writer
        FileStream fs = new FileStream(pathout, FileMode.Create, FileAccess.Write);
        PdfWriter writer = PdfWriter.GetInstance(document, fs);
        document.Open();

        // the pdf content
        PdfContentByte cb = writer.DirectContent;

        // create the new page and add it to the pdf
        PdfImportedPage page = writer.GetImportedPage(reader, 1);
        PdfImportedPage page1 = writer.GetImportedPage(reader1, 1);

        cb.AddTemplate(page, 0, 0);
        cb.AddTemplate(page1, 500, 0);
        // close the streams and voilá the file should be changed :)
        document.Close();
        fs.Close();
        writer.Close();
        reader.Close();
        reader1.Close();
    }

String text += PdfTextExtractor.GetTextFromPage(reader, pageno ,new LocationTextExtractionStrategy());