如何在Itextsharp中以PDF格式在页脚中添加页码

Question

我在ASP.NET代码中使用iTextSharp DLL.我正在将数据提取到数据集中并将数据集添加到PDF表中.

如果我的数据集有100行,那么将在PDF表格中添加100行,并在PDF文件中创建3或4页.

如何在每个页面中添加页脚？

Answer 1

您需要从PdfPageEventHelper类继承并覆盖下面代码段中显示的方法:

Document doc = new Document(PageSize.A4.Rotate());        

using (MemoryStream ms = new MemoryStream())
{
  PdfWriter writer = PdfWriter.GetInstance(doc, ms);
  PageEventHelper pageEventHelper = new PageEventHelper();
  writer.PageEvent = pageEventHelper;
}

 public class PageEventHelper : PdfPageEventHelper
    {
        PdfContentByte cb;
        PdfTemplate template;


        public override void OnOpenDocument(PdfWriter writer, Document document)
        {
            cb = writer.DirectContent;
            template = cb.CreateTemplate(50, 50);
        }

        public override void OnEndPage(PdfWriter writer, Document document)
        {
            base.OnEndPage(writer, document);

            int pageN = writer.PageNumber;
            String text = "Page " + pageN.ToString() + " of ";
            float len = this.RunDateFont.BaseFont.GetWidthPoint(text, this.RunDateFont.Size);

            iTextSharp.text.Rectangle pageSize = document.PageSize;

            cb.SetRGBColorFill(100, 100, 100);

            cb.BeginText();
            cb.SetFontAndSize(this.RunDateFont.BaseFont, this.RunDateFont.Size);
            cb.SetTextMatrix(document.LeftMargin, pageSize.GetBottom(document.BottomMargin));
            cb.ShowText(text);

            cb.EndText();

            cb.AddTemplate(template, document.LeftMargin + len, pageSize.GetBottom(document.BottomMargin));
        }

        public override void OnCloseDocument(PdfWriter writer, Document document)
        {
            base.OnCloseDocument(writer, document);

            template.BeginText();
            template.SetFontAndSize(this.RunDateFont.BaseFont, this.RunDateFont.Size);
            template.SetTextMatrix(0, 0);
            template.ShowText("" + (writer.PageNumber - 1));
            template.EndText();
        }
    }