Merge Conversion Result with Existing PDFs

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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

using Microsoft.AspNetCore.Hosting;

// Use EVO PDF Namespace
using EvoPdf;

namespace EvoHtmlToPdfDemo.Controllers
{
    public class Merge_With_Existing_PDFController : Controller
    {
        private readonly Microsoft.AspNetCore.Hosting.IHostingEnvironment m_hostingEnvironment;
        public Merge_With_Existing_PDFController(IHostingEnvironment hostingEnvironment)
        {
            m_hostingEnvironment = hostingEnvironment;
        }

        // GET: Merge_With_Existing_PDF
        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public ActionResult ConvertHtmlToPdf(IFormCollection collection)
        {
            // Create a HTML to PDF converter object with default settings
            HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

            // 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 = m_hostingEnvironment.ContentRootPath + "/wwwroot" + "/DemoAppFiles/Input/PDF_Files/Merge_Before_Conversion.pdf";
            htmlToPdfConverter.PdfDocumentOptions.AddStartDocument(pdfFileBefore);

            // Set the PDF file to be added after conversion result
            string pdfFileAfter = m_hostingEnvironment.ContentRootPath + "/wwwroot" + "/DemoAppFiles/Input/PDF_Files/Merge_After_Conversion.pdf";
            htmlToPdfConverter.PdfDocumentOptions.AddEndDocument(pdfFileAfter);

            // The URL to convert
            string url = collection["urlTextBox"];

            // Convert the HTML page to a PDF document and add the external PDF documents
            byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);

            // Send the PDF file to browser
            FileResult fileResult = new FileContentResult(outPdfBuffer, "application/pdf");
            fileResult.FileDownloadName = "Merge_HTML_with_Existing_PDF.pdf";

            return fileResult;
        }
    }
}