C#给PDF文件添加水印

时间：2022-06-25 07:49:15 编辑：袖梨来源：一聚教程网

代码如下复制代码

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.SampleC#NETExoport2PDFWeb2Chap1011.pdf"; //模板路径

string output = @"D:My.SampleC#NETExoport2PDFWeb2Chap1012.pdf"; //导出水印背景后的PDF

string watermark = @"D:My.SampleC#NETExoport2PDFWeb2gp0.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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