Replace Images with Higher Quality Images

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 EvoPdfClient;

namespace EvoHtmlToPdfDemo.Controllers.HTML_to_PDF.Images_Quality
{
    public class Replace_with_Higher_Quality_ImagesController : Controller
    {
        private readonly Microsoft.AspNetCore.Hosting.IWebHostEnvironment m_hostingEnvironment;
        public Replace_with_Higher_Quality_ImagesController(IWebHostEnvironment hostingEnvironment)
        {
            m_hostingEnvironment = hostingEnvironment;
        }

        [HttpPost]
        public ActionResult ConvertHtmlToPdf(IFormCollection collection)
        {
            // Get the server options
            string serverIP = collection["textBoxServerIP"];
            uint serverPort = uint.Parse(collection["textBoxServerPort"]);
            string servicePassword = collection["textBoxServicePassword"];
            bool useServicePassword = servicePassword.Length > 0;
            bool useTcpService = collection["ServerType"] == "radioButtonUseTcpService";
            string webServiceUrl = collection["textBoxWebServiceUrl"];

            // Create the HTML to PDF converter object
            HtmlToPdfConverter htmlToPdfConverter = null;
            if (useTcpService)
                htmlToPdfConverter = new HtmlToPdfConverter(serverIP, serverPort);
            else
                htmlToPdfConverter = new HtmlToPdfConverter(true, webServiceUrl);

            // Set optional service password
            if (useServicePassword)
                htmlToPdfConverter.ServicePassword = servicePassword;

            // 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;

            // Select all images from HTML page
            htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementSelectors = new string[] { "img" };

            // Exclude the original images from rendering becuase they will be replaced by an image from local file system
            htmlToPdfConverter.HiddenHtmlElementsSelectors = new string[] { "img" };

            // Convert a HTML string with images to replace to a PDF document object
            Document pdfDocument = htmlToPdfConverter.ConvertUrlToPdfDocumentObject(collection["urlTextBox"]);

            // Replace the images selected in HTML using special attributes with images from local file system
            int mappingsCount = htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult.Count;
            for (int i = 0; i < mappingsCount; i++)
            {
                HtmlElementMapping imageElementInfo = htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult.GetByIndex(i);
                PdfPage imagePdfPage = pdfDocument.GetPage(imageElementInfo.PdfRectangles[0].PageIndex);
                RectangleFloat imageRectangle = imageElementInfo.PdfRectangles[0].Rectangle;

                ImageElement newImageElement = new ImageElement(imageRectangle.X, imageRectangle.Y, imageRectangle.Width, imageRectangle.Height,
                                m_hostingEnvironment.ContentRootPath + "/wwwroot" + "/DemoAppFiles/Input/Images/box.jpg");
                newImageElement.EnlargeEnabled = true;
                imagePdfPage.AddElement(newImageElement);
            }

            // Save the PDF document in a memory buffer
            byte[] outPdfBuffer = pdfDocument.Save();

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

            return fileResult;
        }
    }
}