C给PDF每一页都加上自己的图片logo标识

　　自己做了一个PDF说明文件给客户，现在需要在每一页上都加上自己的logo图片，具体操作过程如下：建项目这些就省略了，直接上代码：using iTextSharp.text.pdf; using System; using System.IO; using System.Windows.Forms;  namespace Pic2PDF {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }          private void button1_Click(object sender, EventArgs e)         {             string path = Application.StartupPath;              //源PDF地址             string pdffilename = path + ＂test.pdf＂;             //加完图片的PDF地址             string pdffilename1 = path + ＂test1.pdf＂;             //图片文件地址             string picfilename = path + ＂sign.jpg＂;              //执行操作,加上图片             string r = AddPics(pdffilename, pdffilename1, picfilename);             MessageBox.Show(r);         }         public static string AddPics(string PdfPath, string OutPdfPath, string picpath)         {             try             {                 if (File.Exists(OutPdfPath))                 {                     File.Delete(OutPdfPath);                 }                 PdfReader reader = new PdfReader(PdfPath);                 PdfStamper stamp = new PdfStamper(reader, new FileStream(OutPdfPath, FileMode.Create));                 int n = reader.NumberOfPages;                 int i = 0;                 PdfContentByte under;                 iTextSharp.text.Image im = iTextSharp.text.Image.GetInstance(picpath);                  PDFATT att = new PDFATT(PdfPath);                 float ww = att.Width();                 float hh = att.Height();                  float w = im.Width;                 float h = im.Height;                   float locationx;                 float locationy;                  locationx = ww - w - 20;                 locationy = 50;                  im.SetAbsolutePosition(locationx, locationy);                 im.ScaleAbsolute(w, h);                  while (i < n)                 {                     i++;                     under = stamp.GetOverContent(i);                     under.AddImage(im, false);                 }                 stamp.Close();                 reader.Close();             }             catch (Exception ex)             {                 return ex.Message;             }             return ＂ok＂;         }         class PDFATT         {             PdfReader reader;             public PDFATT(string iPdfFilePath)             {                 reader = new PdfReader(iPdfFilePath);             }             public int PageCount()             {                 return reader.NumberOfPages;             }             public float Width()             {                 return reader.GetPageSize(1).Width;             }             public float Height()             {                 return reader.GetPageSize(1).Height;             }         }     } }我这里设置的是添加到右下角了，位置的代码主要在这个地方
　　PDFATT att = new PDFATT(PdfPath);
　　float ww = att.Width(); //PDF的宽度
　　float hh = att.Height(); //PDF的高度
　　float w = im.Width; //图片宽
　　float h = im.Height; //图片高
　　float locationx;
　　float locationy;
　　locationx = ww - w - 20; //横向位置自己计算
　　locationy = 50; //纵向位置自己试下就行
　　其它的都很简单了。运行效果如下：