Footer in pdf with iTextSharp

问题

I'm trying to add a footer in every page of a PDF document. I want to have a name and the current date. I'm using this code, but it's only printing in the last page. I need it in every page. What am I missing here?

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

回答1:

I manage to fix doing this. In my class that create the pdf i add this line.

pdfWriter.PageEvent = new PDFFooter();

and i created another class called PDFFooter.

 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);
        }
    }
}

来源：https://stackoverflow.com/questions/39603619/footer-in-pdf-with-itextsharp