EVO HTML to PDF Converter allows you to insert existing PDF documents before the HTML to PDF conversion result and to add existing PDF documents after conversion result using the PdfDocumentOptionsAddStartDocument(String) and PdfDocumentOptionsAddEndDocument(String) methods. An object of PdfDocumentOptions type is exposed by the HtmlToPdfConverterPdfDocumentOptions property. The PDF documents can be loaded from files or streams or they can be existing Document objects previously created in your application.
Code Sample - Merge Conversion Result with Existing PDFs
C#
protected void convertToPdf() { // Get the server IP and port String serverIP = textBoxServerIP.Text; uint serverPort = uint.Parse(textBoxServerPort.Text); // Create a HTML to PDF converter object HtmlToPdfConverter htmlToPdfConverter = null; if (radioButtonUseTcpService.Checked) htmlToPdfConverter = new HtmlToPdfConverter(serverIP, serverPort); else htmlToPdfConverter = new HtmlToPdfConverter(true, textBoxWebServiceUrl.Text); // Set optional service password if (textBoxServicePassword.Text.Length > 0) htmlToPdfConverter.ServicePassword = textBoxServicePassword.Text; // Set license key received after purchase to use the converter in licensed mode // Leave it not set to use the converter in demo mode htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c="; // Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed // Set this property to 0 if you don't need to wait for such asynchcronous operations to finish htmlToPdfConverter.ConversionDelay = 2; // Set the PDF file to be inserted before conversion result string pdfFileBefore = Server.MapPath("~/DemoAppFiles/Input/PDF_Files/Merge_Before_Conversion.pdf"); htmlToPdfConverter.PdfDocumentOptions.AddStartDocument(pdfFileBefore); // Set the PDF file to be added after conversion result string pdfFileAfter = Server.MapPath("~/DemoAppFiles/Input/PDF_Files/Merge_After_Conversion.pdf"); htmlToPdfConverter.PdfDocumentOptions.AddEndDocument(pdfFileAfter); // The URL to convert string url = urlTextBox.Text; // Convert the HTML page to a PDF document and add the external PDF documents byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(url); }