C#利用iTextSharp添加PDF水印

 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-600"); } 

 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-600"); 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; } } 

 //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-600|*.jpg-600|*.jpeg|*.jpeg|*.bmp|*.bmp|*.gif|*.gif|*.png-600|*.png-600|*.Tiff|*.Tiff|*.Wmf|*.Wmf"; if (fileDialog.ShowDialog() == DialogResult.OK) { textBox3.Text = fileDialog.FileName; } } 

 //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(); } 

 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); } }