C # add watermark to PDF file by code method sharing

This article mainly for you to introduce in detail the C # to the PDF file to add watermark code, with a certain reference value, interested in small partners can refer to

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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:5.1.10protected void Button1_Click (object sender, EventArgs e) {string source =@ "D:\my.sample\c#net\exoport2pdf\web2\chap1011.pdf"; Template path String output = @ "D:\my.sample\c#net\exoport2pdf\web2\chap1012.pdf";  Export the watermark background after the PDF string watermark = @ "D:\my.sample\c#net\exoport2pdf\web2\gp0.jpg";       Watermark picture 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;//transparency, gray fill//image. rotation//rotating//image. rotationdegrees//rotation angle//watermark position if (left < 0) {left = Width-image.      Width + left; } image. SetAbsolutePosition (left, (height-image).      Height)-top); Watermark per page, you can also set a page watermark for (int i = 1; I <= numberofpages; i++) {watermarkcontent = Pdfstamper.getunde        Rcontent (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 (); }