Add HTML in Header and Footer

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.Headers_and_Footers
{
    public class HTML_in_Header_FooterController : Controller
    {
        IFormCollection formCollection;

        private readonly Microsoft.AspNetCore.Hosting.IWebHostEnvironment m_hostingEnvironment;
        public HTML_in_Header_FooterController(IWebHostEnvironment hostingEnvironment)
        {
            m_hostingEnvironment = hostingEnvironment;
        }

        [HttpPost]
        public ActionResult ConvertHtmlToPdf(IFormCollection collection)
        {
            formCollection = 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;

            // Add Header

            // Enable header in the generated PDF document
            htmlToPdfConverter.PdfDocumentOptions.ShowHeader = collection["addHeaderCheckBox"].Count > 0;

            // Optionally add a space between header and the page body
            // The spacing for first page and the subsequent pages can be set independently
            // Leave this option not set for no spacing
            htmlToPdfConverter.PdfDocumentOptions.Y = float.Parse(collection["firstPageSpacingTextBox"]);
            htmlToPdfConverter.PdfDocumentOptions.TopSpacing = float.Parse(collection["headerSpacingTextBox"]);

            // Draw header elements
            if (htmlToPdfConverter.PdfDocumentOptions.ShowHeader)
                DrawHeader(htmlToPdfConverter, collection["drawHeaderLineCheckBox"].Count > 0);

            // Add Footer

            // Enable footer in the generated PDF document
            htmlToPdfConverter.PdfDocumentOptions.ShowFooter = collection["addFooterCheckBox"].Count > 0;

            // Optionally add a space between footer and the page body
            // Leave this option not set for no spacing
            htmlToPdfConverter.PdfDocumentOptions.BottomSpacing = float.Parse(collection["footerSpacingTextBox"]);

            // Draw footer elements
            if (htmlToPdfConverter.PdfDocumentOptions.ShowFooter)
                DrawFooter(htmlToPdfConverter, collection["addPageNumbersInFooterCheckBox"].Count > 0, collection["drawFooterLineCheckBox"].Count > 0);

            // Convert the HTML page to a PDF document in a memory buffer
            byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(collection["urlTextBox"]);

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

            return fileResult;
        }

        /// <summary>
        /// Draw the header elements
        /// </summary>
        /// <param name="htmlToPdfConverter">The HTML to PDF Converter object</param>
        /// <param name="drawHeaderLine">A flag indicating if a line should be drawn at the bottom of the header</param>
        private void DrawHeader(HtmlToPdfConverter htmlToPdfConverter, bool drawHeaderLine)
        {
            string headerHtmlString = System.IO.File.ReadAllText(m_hostingEnvironment.ContentRootPath + "/wwwroot" + "/DemoAppFiles/Input/HTML_Files/Header_HTML.html");
            string headerBaseUrl = "http://www.evopdf.com/demo/DemoAppFiles/Input/HTML_Files/";

            // Set the header height in points
            htmlToPdfConverter.PdfHeaderOptions.HeaderHeight = 60;

            // Set header background color
            htmlToPdfConverter.PdfHeaderOptions.HeaderBackColor = RgbColor.White;

            // Create a HTML element to be added in header
            HtmlToPdfElement headerHtml = new HtmlToPdfElement(headerHtmlString, headerBaseUrl);

            // Set the HTML element to fit the container height
            headerHtml.FitHeight = true;

            // Add HTML element to header
            htmlToPdfConverter.PdfHeaderOptions.AddElement(headerHtml);

            if (drawHeaderLine)
            {
                // Calculate the header width based on PDF page size and margins
                float headerWidth = htmlToPdfConverter.PdfDocumentOptions.PdfPageSize.Width -
                            htmlToPdfConverter.PdfDocumentOptions.LeftMargin - htmlToPdfConverter.PdfDocumentOptions.RightMargin;

                // Calculate header height
                float headerHeight = htmlToPdfConverter.PdfHeaderOptions.HeaderHeight;

                // 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 = RgbColor.Gray;

                // Add line element to the bottom of the header
                htmlToPdfConverter.PdfHeaderOptions.AddElement(headerLine);
            }

            // set header visibility in PDF pages
            htmlToPdfConverter.PdfHeaderOptions.ShowInFirstPage = formCollection["showHeaderInFirstPageCheckBox"].Count > 0;
            htmlToPdfConverter.PdfHeaderOptions.ShowInOddPages = formCollection["showHeaderInOddPagesCheckBox"].Count > 0;
            htmlToPdfConverter.PdfHeaderOptions.ShowInEvenPages = formCollection["showHeaderInEvenPagesCheckBox"].Count > 0;
        }

        /// <summary>
        /// Draw the footer elements
        /// </summary>
        /// <param name="htmlToPdfConverter">The HTML to PDF Converter object</param>
        /// <param name="addPageNumbers">A flag indicating if the page numbering is present in footer</param>
        /// <param name="drawFooterLine">A flag indicating if a line should be drawn at the top of the footer</param>
        private void DrawFooter(HtmlToPdfConverter htmlToPdfConverter, bool addPageNumbers, bool drawFooterLine)
        {
            string footerHtmlString = System.IO.File.ReadAllText(m_hostingEnvironment.ContentRootPath + "/wwwroot" + "/DemoAppFiles/Input/HTML_Files/Footer_HTML.html");
            string footerBaseUrl = "http://www.evopdf.com/demo/DemoAppFiles/Input/HTML_Files/";

            // Set the footer height in points
            htmlToPdfConverter.PdfFooterOptions.FooterHeight = 60;

            // Set footer background color
            htmlToPdfConverter.PdfFooterOptions.FooterBackColor = RgbColor.WhiteSmoke;

            // Create a HTML element to be added in footer
            HtmlToPdfElement footerHtml = new HtmlToPdfElement(footerHtmlString, footerBaseUrl);

            // Set the HTML element to fit the container height
            footerHtml.FitHeight = true;

            // Add HTML element to footer
            htmlToPdfConverter.PdfFooterOptions.AddElement(footerHtml);

            // Add page numbering
            if (addPageNumbers)
            {
                // Create a text element with page numbering place holders &p; and & P;
                TextElement footerText = new TextElement(0, 30, "Page &p; of &P;  ", new PdfFont("Times New Roman", 10, true));

                // Align the text at the right of the footer
                footerText.TextAlign = HorizontalTextAlign.Right;

                // Set page numbering text color
                footerText.ForeColor = RgbColor.Navy;

                // Embed the text element font in PDF
                footerText.EmbedSysFont = true;

                // Add the text element to footer
                htmlToPdfConverter.PdfFooterOptions.AddElement(footerText);
            }

            if (drawFooterLine)
            {
                // Calculate the footer width based on PDF page size and margins
                float footerWidth = htmlToPdfConverter.PdfDocumentOptions.PdfPageSize.Width -
                            htmlToPdfConverter.PdfDocumentOptions.LeftMargin - htmlToPdfConverter.PdfDocumentOptions.RightMargin;

                // Create a line element for the top of the footer
                LineElement footerLine = new LineElement(0, 0, footerWidth, 0);

                // Set line color
                footerLine.ForeColor = RgbColor.Gray;

                // Add line element to the bottom of the footer
                htmlToPdfConverter.PdfFooterOptions.AddElement(footerLine);
            }

            // set footer visibility in PDF pages
            htmlToPdfConverter.PdfFooterOptions.ShowInFirstPage = formCollection["showHeaderInFirstPageCheckBox"].Count > 0;
            htmlToPdfConverter.PdfFooterOptions.ShowInOddPages = formCollection["showFooterInOddPagesCheckBox"].Count > 0;
            htmlToPdfConverter.PdfFooterOptions.ShowInEvenPages = formCollection["showFooterInEvenPagesCheckBox"].Count > 0;
        }
    }
}