c# - 使用 iTextSharp 生成 pdf 页脚

Question

我正在尝试在 PDF 文档的每一页中添加页脚。我想要一个名字和当前日期。我正在使用这段代码，但它只在最后一页打印。我在每一页都需要它。我在这里缺少什么？

DateTime horario = DateTime.MinValue;
document.Add(new iText.Paragraph(document.BottomMargin, "TEST FOOTER" + horario));

Answer 1

我设法解决了这个问题。在我创建 pdf 的类(class)中​​，我添加了这一行。

pdfWriter.PageEvent = new PDFFooter();

我创建了另一个名为 PDFFooter 的类。

 public class PDFFooter : PdfPageEventHelper
    {
        // write on top of document
        public override void OnOpenDocument(PdfWriter writer, Document document)
        {
            base.OnOpenDocument(writer, document);
            PdfPTable tabFot = new PdfPTable(new float[] { 1F });
            tabFot.SpacingAfter = 10F;
            PdfPCell cell;
            tabFot.TotalWidth = 300F;
            cell = new PdfPCell(new Phrase(""));
            cell.Border = Rectangle.NO_BORDER;
            tabFot.AddCell(cell);
            tabFot.WriteSelectedRows(0, -1, 150, document.Top, writer.DirectContent);
        }

        // write on start of each page
        public override void OnStartPage(PdfWriter writer, Document document)
        {
            base.OnStartPage(writer, document);
        }

        // write on end of each page
        public override void OnEndPage(PdfWriter writer, Document document)
        {
            DateTime horario = DateTime.Now;
            base.OnEndPage(writer, document);
            PdfPTable tabFot = new PdfPTable(new float[] { 1F });
            PdfPCell cell;
            tabFot.TotalWidth = 300F;
            cell = new PdfPCell(new Phrase("TEST"+" - " + horario));
            cell.Border = Rectangle.NO_BORDER;
            cell.HorizontalAlignment = Element.ALIGN_CENTER;
            tabFot.AddCell(cell);
            tabFot.WriteSelectedRows(0, -1, 150, document.Bottom, writer.DirectContent);
        }

        //write on close of document
        public override void OnCloseDocument(PdfWriter writer, Document document)
        {
            base.OnCloseDocument(writer, document);
        }
    }
}