iTextSharp页脚使用，添加横线

           //字体
           Font font = new Font(BaseFont.CreateFont("字体文件路径", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED), 24, Font.BOLD));
           
           Document document = new Document(PageSize.A4);                
           document.SetMargins(55, 55, 38, 70);//页边距设置：左，右，上，下

            PdfWriter writer = PdfWriter.GetInstance(document, new FileStream("生成的PDF文件全路径和名称", FileMode.Create));
            SetFooter(writer);//设置页脚（包括页眉）
            
            document.Open();               
            // 初始化头部表格
            PdfPTable headTable = new PdfPTable(2)
            {
                HorizontalAlignment = (Element.ALIGN_CENTER),
                WidthPercentage = (100)
            };
            headTable.SetWidths(new int[] { 55, 45 });
            headTable.SpacingBefore = (20);
            
            // 标题名称               
            string title = "PDF的标题";
            Chunk formChunk = new Chunk(title, font);
            PdfPCell formCell = new PdfPCell(new Phrase(formChunk));
            formCell.HorizontalAlignment = (Element.ALIGN_CENTER);
            formCell.Border = (0);
            formCell.Colspan = (2);
            headTable.AddCell(formCell);
            // 添加头部表格
            document.Add(headTable);

            PdfPTable blxxTab = CreateBlxxPdfTable();
            document.Add(blxxTab);
           
            // 已占用高度
            float topHeight = headTable.TotalHeight + blxxTab.TotalHeight;
            int pageCount = writer.PageNumber;
            document.Close();
    
    //主体内容
    private PdfPTable CreateBlxxPdfTable()        
     {            
        PdfPTable blxxTab = new PdfPTable(42);
        blxxTab.HorizontalAlignment = (Element.ALIGN_CENTER);
        blxxTab.WidthPercentage = (100);
        blxxTab.SetWidths(new int[] { 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 14, 15 });
        blxxTab.SpacingBefore = (20);

        //时间
        PdfPCell Lable = PdfPrintUtil.GetTableCell("时间", font, 0, qdTableRowMiniHeight);
        Lable.BorderWidth = (1);
        Lable.HorizontalAlignment = (Element.ALIGN_LEFT);
        Lable.Border = (Rectangle.LEFT_BORDER); ;
        Lable.DisableBorderSide(Rectangle.LEFT_BORDER);
        Lable.Colspan = (3);
        blxxTab.AddCell(Lable);

        PdfPCell time = PdfPrintUtil.GetTableCell(DateTime.Now.ToString(), font, 0, qdTableRowMiniHeight);
        time.Colspan = (39);
        time.Border = (Rectangle.BOTTOM_BORDER);
        blxxTab.AddCell(time);
        return blxxTab;
    }

    /// 

    /// 设置页脚
    /// 
    /// 
    private void SetFooter(PdfWriter writer)
    {         
        PdfHeaderFooter headerFooter = new PdfHeaderFooter();            
        writer.SetBoxSize("art", PageSize.A4);
        writer.PageEvent = headerFooter;
    }


using iTextSharp.text;
using iTextSharp.text.pdf;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
public class PdfHeaderFooter : PdfPageEventHelper
{
    /**
* 页眉
*/
    public String header = "";

    /**
     * 文档字体大小，页脚页眉最好和文本大小一致
     */
    public int presentFontSize = 15;

    /**
     * 文档页面大小，最好前面传入，否则默认为A4纸张
     */
    public Rectangle pageSize = PageSize.A4;

    // 模板
    public PdfTemplate total;

    // 基础字体对象
    public BaseFont bf = null;

    // 利用基础字体生成的字体对象，一般用于生成中文文字
    public Font fontDetail = null;

    /**
     *
     * Creates a new instance of PdfReportM1HeaderFooter 无参构造方法.
     *
     */
    public PdfReportM1HeaderFooter()
    {

    }

    /**
     *
     * Creates a new instance of PdfReportM1HeaderFooter 构造方法.
     *
     * @param yeMei
     *            页眉字符串
     * @param presentFontSize
     *            数据体字体大小
     * @param pageSize
     *            页面文档大小，A4，A5，A6横转翻转等Rectangle对象
     */
    public PdfReportM1HeaderFooter(String yeMei, int presentFontSize, Rectangle pageSize)
    {
        this.header = yeMei;
        this.presentFontSize = presentFontSize;
        this.pageSize = pageSize;
    }

    public void setHeader(String header)
    {
        this.header = header;
    }

    public void SetPresentFontSize(int presentFontSize)
    {
        this.presentFontSize = presentFontSize;
    }

    /**
     *
     * TODO 文档打开时创建模板
     *
     * @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
     */
    public override void OnOpenDocument(PdfWriter writer, Document document)
    {
        total = writer.DirectContent.CreateTemplate(50, 50);// 共 页 的矩形的长宽高
    }

    /**
     *
     * TODO 关闭每页的时候，写入
     *
     * @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
     */
    public override void OnEndPage(PdfWriter writer, Document document)
    {
        float y = 20;
        
        if (bf == null)
        {
            bf = new Font(BaseFont.CreateFont("字体文件路径", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED), 24, Font.BOLD));
        }
        if (fontDetail == null)
        {
            fontDetail = new Font(BaseFont.CreateFont("字体文件路径", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED), 24, Font.BOLD));
        }
       
        // 1.写入页眉
        ColumnText.ShowTextAligned(writer.DirectContent, Element.ALIGN_LEFT, new Phrase(header, fontDetail), document.Left, document.Top + 20, 0);

        // 2.写入 第 X页/共          
        int pageS = writer.PageNumber;
        String foot3 = "第 " + pageS + " 页 共";
        Phrase footer3 = new Phrase(foot3, fontDetail);

        // 3.计算前半部分的foot1的长度，后面好定位最后一部分的'Y页'这俩字的x轴坐标，字体长度也要计算进去 = len
        float len = bf.GetWidthPoint(foot3, presentFontSize);

        // 4.拿到当前的PdfContentByte
        PdfContentByte cb = writer.DirectContent;
       //上下添加横线
        var line = new iTextSharp.text.pdf.draw.LineSeparator(1F, (document.Right - document.LeftMargin) * -1, Color.BLACK, Element.ALIGN_LEFT, 7F);            
        if (pageS > 1)
        {
            line = new iTextSharp.text.pdf.draw.LineSeparator(1F, (document.Right - document.LeftMargin) * -1, Color.BLACK, Element.ALIGN_LEFT, 7.5F);

            var lineTop = new iTextSharp.text.pdf.draw.LineSeparator(1.5F, (document.Right - document.LeftMargin) * -1, Color.BLACK, Element.ALIGN_LEFT, 0F);
            Paragraph pTop = new Paragraph(new Chunk(lineTop));
            ColumnText.ShowTextAligned(cb, Element.ALIGN_LEFT, pTop, document.LeftMargin, document.Top, 0);//首行横线
        }           
        Paragraph p = new Paragraph(new Chunk(line));
        ColumnText.ShowTextAligned(cb, Element.ALIGN_LEFT, p, document.LeftMargin, document.BottomMargin, 0);//页脚横线

        // 5.写入页脚1，x轴就是(右margin+左margin + right() -left()- len)/2.0F 再给偏移20F适合人类视觉感受，否则肉眼看上去就太偏左了 ,y轴就是底边界-20,否则就贴边重叠到数据体里了就不是页脚了；注意Y轴是从下往上累加的，最上方的Top值是大于Bottom好几百开外的。           
        ColumnText.ShowTextAligned(cb, Element.ALIGN_LEFT, footer3, document.Right - 165 + document.LeftMargin, y, 0);

        // 6.写入页脚2的模板（就是页脚的Y页这俩字）添加到文档中，计算模板的和Y轴,X=(右边界-左边界 - 前半部分的len值)/2.0F + len ， y 轴和之前的保持一致，底边界-20
        cb.AddTemplate(total, document.Right - 165 + document.LeftMargin + len, y); // 调节模版显示的位置
        if (pageS > 0)
        {
                QrCodePath = Path.Combine(HTKApp.RunFolder, AppPath.TmpDir, $"{HTKApp.RandomSn}.png");
                MakeQrCode.GetBlBarCodeFilePath(QrCodePath, Bllx, BlxxId, pageS, 150, 150);
                if (File.Exists(QrCodePath))
                {
                    try
                    {
                        Image image = Image.GetInstance(QrCodePath);
                        image.SetDpi(1000, 1000);
                        image.ScaleToFit(65, 65);
                        image.SetAbsolutePosition(490f, 25f);
                        cb.AddImage(image);
                    }
                    catch (Exception)
                    {

                    }
                }
            }
        
    }

    /**
     *
     * TODO 关闭文档时，替换模板，完成整个页眉页脚组件
     *
     * @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
     */
    public override void OnCloseDocument(PdfWriter writer, Document document)
    {
        // 7.最后一步了，就是关闭文档的时候，将模板替换成实际的 Y 值,至此，page x of y 制作完毕，完美兼容各种文档size。
        total.BeginText();
        total.SetFontAndSize(bf, presentFontSize);// 生成的模版的字体、颜色
        String foot2 = " " + (writer.PageNumber - 1) + " 页";
        total.ShowText(foot2);// 模版显示的内容
        total.EndText();
        total.ClosePath();
    }
}