本文实例为大家分享了C#添加PDF文件水印的具体代码，供大家参考，具体内容如下
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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，灰色填充
//image.Rotation//旋转
//image.RotationDegrees//旋转角度
//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,也可以设置某一页加水印
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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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。