C# PDF加盖电子章

winform界面

 1.选择加签pdf按钮代码实现

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   private void button1_Click(object sender, EventArgs e)
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   {
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   OpenFileDialog op = new OpenFileDialog();
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   op.Filter = "PDF文件(*.pdf)|*.pdf";
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   bool flag = op.ShowDialog() == DialogResult.OK;
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   if (flag)
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   {
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   string pdfPath = Path.GetFullPath(op.FileName);
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   fileName = op.SafeFileName;
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    label2.Text = pdfPath;
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    }
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    }

每页加签按钮代码实现

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   private void button2_Click(object sender, EventArgs e)
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   {
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   string path = Application.StartupPath;
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   SignEachPage(label2.Text.ToString(), path "/PDF/" fileName, path @"\InspectionSeal\电子章.png"); // 参数（原pdf地址,加签后pdf地址,电子章地址）
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   Process.Start("explorer", Application.StartupPath "\\PDF");
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   label4.Text = path "/PDF/" fileName;
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   }

SignEachPage方法代码实现

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   public static void SignEachPage(string pdfPath, string outPdfPath, string imagePath)
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   {
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   //读取pdf
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   iTextSharp.text.pdf.PdfReader pdfReader = new iTextSharp.text.pdf.PdfReader(pdfPath);
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   //读取页数
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   int pdfPageSize = pdfReader.NumberOfPages;
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   //创建新pdf
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   System.IO.FileStream outputStream = new System.IO.FileStream(outPdfPath, System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.None);
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   iTextSharp.text.pdf.PdfStamper pdfStamper = new iTextSharp.text.pdf.PdfStamper(pdfReader, outputStream);
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    //文件内容
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    iTextSharp.text.pdf.PdfContentByte waterMarkContent;
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    //读取第一页尺寸
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    iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(1);
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    //读取盖章图片
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    iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(imagePath);
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    //图片缩放到一定百分比
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    image.ScalePercent(60);
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    //设置图片位置,位置偏移方向为：左到右,下到上
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    image.SetAbsolutePosition(psize.Width / 10 * 7, psize.Height / 10);
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    //循环给每页盖章
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    for (int i = 1; i <= pdfPageSize; i )
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    {
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    //GetUnderContent 加在内容下层
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    //GetOverContent 加在内容上层
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    waterMarkContent = pdfStamper.GetUnderContent(i);
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    //添加
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    waterMarkContent.AddImage(image);
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    }
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    pdfStamper.Close();
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    pdfReader.Close();
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    //直接打开盖章后文件
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    // System.Diagnostics.Process.Start(outPdfPath);
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    }

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