HTML to PDF Converter Overview

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

// Use EVO PDF Namespace
using EvoPdf.Chromium;

namespace EvoPdf_Chromium_AspNetDemo.Controllers.HTML_to_PDF
{
    public class HTML_to_PDF_Getting_StartedController : Controller
    {
        // GET: Getting_Started
        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 HTML Viewer width in pixels which is the equivalent in converter of the browser window width
            htmlToPdfConverter.HtmlViewerWidth = int.Parse(collection["htmlViewerWidthTextBox"]);

            // Set the initial HTML viewer height in pixels
            if (collection["htmlViewerHeightTextBox"][0].Length > 0)
                htmlToPdfConverter.HtmlViewerHeight = int.Parse(collection["htmlViewerHeightTextBox"]);

            // Set the HTML content zoom percentage similar to zoom level in a browser
            htmlToPdfConverter.HtmlViewerZoom = int.Parse(collection["htmlViewerZoomTextBox"]);

            // optionally auto resize HTML viewer height at the HTML content size determined after the initial loading
            htmlToPdfConverter.AutoResizeHtmlViewerHeight = collection["autoResizeViewerHeightCheckBox"].Count > 0;

            // Set the media type for which to render HTML to PDF
            htmlToPdfConverter.MediaType = collection["MediaType"] == "printMediaTypeRadioButton" ? "print" : "screen";

            // Set PDF page size which can be a predefined size like A4 or a custom size in points 
            // Leave it not set to have a default A4 PDF page
            htmlToPdfConverter.PdfDocumentOptions.PdfPageSize = SelectedPdfPageSize(collection["pdfPageSizeDropDownList"]);

            // Set PDF page orientation to Portrait or Landscape
            // Leave it not set to have a default Portrait orientation for PDF page
            htmlToPdfConverter.PdfDocumentOptions.PdfPageOrientation = SelectedPdfPageOrientation(collection["pdfPageOrientationDropDownList"]);

            // optionally auto resize PDF page width to HTML viewer width
            htmlToPdfConverter.PdfDocumentOptions.AutoResizePdfPageWidth = collection["autoResizePdfPageWidthCheckBox"].Count > 0;

            // Set PDF page margins in points or leave them not set to have a PDF page without margins
            htmlToPdfConverter.PdfDocumentOptions.LeftMargin = int.Parse(collection["leftMarginTextBox"]);
            htmlToPdfConverter.PdfDocumentOptions.RightMargin = int.Parse(collection["rightMarginTextBox"]);
            htmlToPdfConverter.PdfDocumentOptions.TopMargin = int.Parse(collection["topMarginTextBox"]);
            htmlToPdfConverter.PdfDocumentOptions.BottomMargin = int.Parse(collection["bottomMarginTextBox"]);

            // Set the maximum time in seconds to wait for HTML page to be loaded 
            // Leave it not set for a default 120 seconds maximum wait time
            htmlToPdfConverter.NavigationTimeout = int.Parse(collection["navigationTimeoutTextBox"]);

            // 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
            if (collection["conversionDelayTextBox"][0].Length > 0)
                htmlToPdfConverter.ConversionDelay = int.Parse(collection["conversionDelayTextBox"]);

            // The buffer to receive the generated PDF document
            byte[] outPdfBuffer = null;

            if (collection["HtmlPageSource"] == "convertUrlRadioButton")
            {

                string url = collection["urlTextBox"];

                // Convert the HTML page given by an URL to a PDF document in a memory buffer
                outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);
            }
            else
            {
                string htmlString = collection["htmlStringTextBox"];
                string baseUrl = collection["baseUrlTextBox"];

                // Convert a HTML string with a base URL to a PDF document in a memory buffer
                outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlString, baseUrl);
            }

            // Send the PDF file to browser
            FileResult fileResult = new FileContentResult(outPdfBuffer, "application/pdf");
            if (collection["openInlineCheckBox"].Count == 0)
            {
                // send as attachment
                fileResult.FileDownloadName = "HTML_to_PDF_Getting_Started.pdf";
            }

            return fileResult;
        }

        private PdfPageSize SelectedPdfPageSize(string selectedValue)
        {
            switch (selectedValue)
            {
                case "A0":
                    return PdfPageSize.A0;
                case "A1":
                    return PdfPageSize.A1;
                case "A10":
                    return PdfPageSize.A10;
                case "A2":
                    return PdfPageSize.A2;
                case "A3":
                    return PdfPageSize.A3;
                case "A4":
                    return PdfPageSize.A4;
                case "A5":
                    return PdfPageSize.A5;
                case "A6":
                    return PdfPageSize.A6;
                case "A7":
                    return PdfPageSize.A7;
                case "A8":
                    return PdfPageSize.A8;
                case "A9":
                    return PdfPageSize.A9;
                case "ArchA":
                    return PdfPageSize.ArchA;
                case "ArchB":
                    return PdfPageSize.ArchB;
                case "ArchC":
                    return PdfPageSize.ArchC;
                case "ArchD":
                    return PdfPageSize.ArchD;
                case "ArchE":
                    return PdfPageSize.ArchE;
                case "B0":
                    return PdfPageSize.B0;
                case "B1":
                    return PdfPageSize.B1;
                case "B2":
                    return PdfPageSize.B2;
                case "B3":
                    return PdfPageSize.B3;
                case "B4":
                    return PdfPageSize.B4;
                case "B5":
                    return PdfPageSize.B5;
                case "Flsa":
                    return PdfPageSize.Flsa;
                case "HalfLetter":
                    return PdfPageSize.HalfLetter;
                case "Ledger":
                    return PdfPageSize.Ledger;
                case "Legal":
                    return PdfPageSize.Legal;
                case "Letter":
                    return PdfPageSize.Letter;
                case "Letter11x17":
                    return PdfPageSize.Letter11x17;
                case "Note":
                    return PdfPageSize.Note;
                default:
                    return PdfPageSize.A4;
            }
        }

        private PdfPageOrientation SelectedPdfPageOrientation(string selectedValue)
        {
            return selectedValue == "Portrait" ? PdfPageOrientation.Portrait : PdfPageOrientation.Landscape;
        }
    }
}