C#给PDF文件增加水印的代码要领分享【C#.Net教程】,C#,PDF,文件水印

这篇文章主要为人人细致引见了C#给PDF文件增加水印的相干代码，具有肯定的参考价值，感兴趣的小伙伴们能够参考一下

本文实例为人人分享了C#增加PDF文件水印的详细代码，供人人参考，详细内容以下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using iTextSharp.text.html.simpleparser;
using iTextSharp.text.pdf;
using iTextSharp.text;
using System.IO;
using System.Web.UI.HtmlControls;
using System.Drawing;

//itextsharp.dll version:5.1.10

protected void Button1_Click(object sender, EventArgs e)
   {
    string source =@"D:\My.Sample\C#NET\Exoport2PDF\Web2\Chap1011.pdf"; //模板途径
    string output = @"D:\My.Sample\C#NET\Exoport2PDF\Web2\Chap1012.pdf"; //导出水印背景后的PDF
    string watermark = @"D:\My.Sample\C#NET\Exoport2PDF\Web2\gp0.jpg";  // 水印图片

    bool isSurrcess = PDFWatermark(source, output, watermark, 10, 10);
    
   }


  public bool PDFWatermark(string inputfilepath, string outputfilepath, string ModelPicName, float top, float left)

  {
    //throw new NotImplementedException();
    PdfReader pdfReader = null;
    PdfStamper pdfStamper = null;
    try
    {
      pdfReader = new PdfReader(inputfilepath);

      int numberOfPages = pdfReader.NumberOfPages;

      iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(1);

      float width = psize.Width;

      float height = psize.Height;

      pdfStamper = new PdfStamper(pdfReader, new FileStream(outputfilepath, FileMode.Create));

      PdfContentByte waterMarkContent;

      iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(ModelPicName);

      image.GrayFill = 20;//透明度，灰色添补
      //image.Rotation//扭转
      //image.RotationDegrees//扭转角度
      //水印的位置 
      if (left < 0)
      {
        left = width - image.Width + left;
      }

      image.SetAbsolutePosition(left, (height - image.Height) - top);


      //每一页加水印,也能够设置某一页加水印 
      for (int i = 1; i <= numberOfPages; i++)
      {
        waterMarkContent = pdfStamper.GetUnderContent(i);

        waterMarkContent.AddImage(image);
      }
      //strMsg = "success";
      return true;
    }
    catch (Exception ex)
    {
       ex.Message.Trim();
      return false;
    }
    finally
    {

      if (pdfStamper != null)
        pdfStamper.Close();

      if (pdfReader != null)
        pdfReader.Close();
    }

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