// Define the PDF Document object as a class member to make it accessible in the headerHtml_NavigationCompletedEvent handler // where the header height will be automatically adjusted private Document pdfDocument; // Indicates if a line should be drawn at the botom of the header private bool drawHeaderLine = true; private void createPdfButton_Click(object sender, EventArgs e) { // Create a PDF document pdfDocument = new Document(); // Set license key received after purchase to use the converter in licensed mode // Leave it not set to use the converter in demo mode pdfDocument.LicenseKey = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og="; // Add a PDF page to PDF document PdfPage pdfPage = pdfDocument.AddPage(); Cursor = Cursors.WaitCursor; string headerHtmlUrl = System.IO.Path.Combine(Application.StartupPath, @"DemoAppFiles\Input\HTML_Files\Header_HTML.html"); string outPdfFile = @"DemoAppFiles\Output\PDF_Creator\Auto_Resize_Header_Footer.pdf"; try { // Add the header to PDF document if (autoResizeHeaderRadioButton.Checked) { // Create the document header with a default height // It will be automatically resized in headerHtml_NavigationCompletedEvent handler pdfDocument.AddHeaderTemplate(50); // Create a HTML element to be added in header HtmlToPdfElement headerHtml = new HtmlToPdfElement(headerHtmlUrl); // Install a handler where to create the document header based on HTML element height headerHtml.NavigationCompletedEvent += new NavigationCompletedDelegate(headerHtml_NavigationCompletedEvent); // Add the HTML element to header // When the element is rendered in header by converter, the headerHtml_NavigationCompletedEvent handler // will be invoked and the header height will be automatically calculated pdfDocument.Header.AddElement(headerHtml); // Uninstall the handler headerHtml.NavigationCompletedEvent += new NavigationCompletedDelegate(headerHtml_NavigationCompletedEvent); } else { // Create the document header with a fixed height pdfDocument.AddHeaderTemplate(float.Parse(headerHeightTextBox.Text)); // Create a HTML to PDF element to be added in header HtmlToPdfElement headerHtml = new HtmlToPdfElement(headerHtmlUrl); // Set the HTML element to fit the container height headerHtml.FitHeight = true; // Add HTML element to fit the fixed header height pdfDocument.Header.AddElement(headerHtml); } // Draw a line at the header bottom if (drawHeaderLine) { float headerWidth = pdfDocument.Header.Width; float headerHeight = pdfDocument.Header.Height; // Create a line element for the bottom of the header LineElement headerLine = new LineElement(0, headerHeight - 1, headerWidth, headerHeight - 1); // Set line color headerLine.ForeColor = Color.Gray; // Add line element to the bottom of the header pdfDocument.Header.AddElement(headerLine); } // Create a HTML to PDF element to add to document HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(urlTextBox.Text); // Optionally set a delay before conversion to allow asynchonous scripts to finish htmlToPdfElement.ConversionDelay = 2; // Add the HTML to PDF element to document pdfPage.AddElement(htmlToPdfElement); // Save the PDF document in a memory buffer byte[] outPdfBuffer = pdfDocument.Save(); // Write the memory buffer in a PDF file System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer); } catch (Exception ex) { // The PDF creation failed MessageBox.Show(String.Format("Create PDF Document Error. {0}", ex.Message)); return; } finally { // Close the PDF document pdfDocument.Close(); Cursor = Cursors.Arrow; } // Open the created PDF document in default PDF viewer try { System.Diagnostics.Process.Start(outPdfFile); } catch (Exception ex) { MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message)); } } /// <summary> /// This handler is called after the navigation to header HTML completed. The document header is resized in this event handler /// </summary> /// <param name="eventParams">The event parameter containing the HTML content size in pixels and points</param> void headerHtml_NavigationCompletedEvent(NavigationCompletedParams eventParams) { // Get the header HTML width and height from event parameters float headerHtmlWidth = eventParams.HtmlContentWidthPt; float headerHtmlHeight = eventParams.HtmlContentHeightPt; // Get the header width float headerWidth = pdfDocument.Header.Width; // Calculate a resize factor to fit the header width float resizeFactor = 1; if (headerHtmlWidth > headerWidth) resizeFactor = headerWidth / headerHtmlWidth; // Calculate the header height to preserve the HTML aspect ratio float headerHeight = headerHtmlHeight * resizeFactor; if (!(headerHeight < pdfDocument.Pages[0].PageSize.Height - pdfDocument.Pages[0].Margins.Top - pdfDocument.Pages[0].Margins.Bottom)) { throw new Exception("The header height cannot be bigger than PDF page height"); } // Set the calculated header height pdfDocument.Header.Height = headerHeight; }