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C#利用iTextSharp添加PDF水印

︶ㄣ米米素材网 メ
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这篇文章主要为大家详细介绍了C#利用iTextSharp添加PDF水印的相关资料，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使用的是iTextSharp添加PDF水印的具体代码，供大家参考，具体内容如下

需要iTextSharp.dll, 下载地址http://sourceforge.net/projects/itextsharp/

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public void Test()
    {
      Watermark(@"E:\日常工作\12084347 config.pdf", @"E:\日常工作\12084347 config wm.pdf", @"E:\日常工作\wm.png");
}   
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public bool AddWatermark(string inputPath, string outputPath, string watermarkPath, ref string error)
   {
     try
     {
       PdfReader pdfReader = new PdfReader(inputPath);
       int numberOfPages = pdfReader.NumberOfPages;
       FileStream outputStream = new FileStream(outputPath, FileMode.Create);
       PdfStamper pdfStamper = new PdfStamper(pdfReader, outputStream);
       PdfContentByte waterMarkContent;
 
       iTextSharp.text.Image image = null;
       if (string.IsNullOrEmpty(watermarkPath))
       {
         Stream s = GetType().Assembly.GetManifestResourceStream("WatermarkTool.wm.png");
         image = iTextSharp.text.Image.GetInstance(s);
       }
       else
       {
         image = iTextSharp.text.Image.GetInstance(watermarkPath);
       }       
       image.SetAbsolutePosition(100, 100);
       for (int i = 1; i <= numberOfPages; i++)
       {
         waterMarkContent = pdfStamper.GetUnderContent(i);
         waterMarkContent.AddImage(image);
       }
       pdfStamper.Close();
       pdfReader.Close();
       outputStream.Close();
       return true;
     }
     catch (Exception ex)
     {
       error = ex.StackTrace;
       return false;
     }
   }
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//选择文件夹
   private void textBox2_DoubleClick(object sender, EventArgs e)
   {
     FolderBrowserDialog dialog = new FolderBrowserDialog();
     dialog.Description = label2.Text;
     if (dialog.ShowDialog() == DialogResult.OK)
     {
       textBox2.Text = dialog.SelectedPath;
     }
   }
 
   //选择文件
   private void textBox3_DoubleClick(object sender, EventArgs e)
   {
     OpenFileDialog fileDialog = new OpenFileDialog();
     fileDialog.Multiselect = true;
     fileDialog.Title = label3.Text;
     fileDialog.Filter = "*.jpg|*.jpg|*.jpeg|*.jpeg|*.bmp|*.bmp|*.gif|*.gif|*.png|*.png|*.Tiff|*.Tiff|*.Wmf|*.Wmf";
     if (fileDialog.ShowDialog() == DialogResult.OK)
     {
       textBox3.Text = fileDialog.FileName;
     }
   }
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//启动线程
   private void button1_Click(object sender, EventArgs e)
   {
     if (Directory.Exists(textBox1.Text) == false )
     {
       MessageBox.Show(label1.Text, "Require input", MessageBoxButtons.OK, MessageBoxIcon.Warning);
       textBox1.Focus();
       return;
     }
     if (Directory.Exists(textBox2.Text) == false)
     {
       MessageBox.Show(label2.Text, "Require input", MessageBoxButtons.OK, MessageBoxIcon.Warning);
       textBox2.Focus();
       return;
     }
     if ( textBox3.Enabled && File.Exists(textBox3.Text) == false)
     {
       MessageBox.Show(label3.Text, "Require input", MessageBoxButtons.OK, MessageBoxIcon.Warning);
       textBox3.Focus();
       return;
     }
 
     richTextBox1.Clear();
     button1.Enabled = false;
     Thread thread = new Thread(new ThreadStart(this.BatchDo));
 
     thread.IsBackground = true;
     thread.Start();
   }
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public delegate void SetControlValue(string message);
   //在线程中修改控件属性
   public void AppendRTBText(string text)
   {
     if (richTextBox1.InvokeRequired)
     {
       SetControlValue cal = delegate(string s) { richTextBox1.AppendText(s); };
       this.Invoke(cal, text);
     }
     else
     {
       richTextBox1.AppendText(text);
     }
   }

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