这篇文章主要为大家详细介绍了c#给pdf文件添加水印的相关代码，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
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
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();
}
以上就是c#给pdf文件添加水印的代码方法分享的详细内容。