C#給PDF文件添加水印

C#給PDF文件添加水印。本站提示廣大學習愛好者：（C#給PDF文件添加水印）文章只能為提供參考，不一定能成為您想要的結果。以下是C#給PDF文件添加水印正文

本文實例為大家分享了C#添加PDF文件水印的具體代碼，供大家參考，具體內容如下

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"; //模板路徑
    string output = @"D:\My.Sample\C#NET\Exoport2PDF\Web2\Chap1012.pdf"; //導出水印背景後的PDF
    string watermark = @"D:\My.Sample\C#NET\Exoport2PDF\Web2\gp0.jpg";  // 水印圖片

    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，灰色填充
      //image.Rotation//旋轉
      //image.RotationDegrees//旋轉角度
      //水印的位置 
      if (left < 0)
      {
        left = width - image.Width + left;
      }

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


      //每一頁加水印,也可以設置某一頁加水印 
      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();
    }

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持。