gehgassi_backend/gehGassi.Web/Helper/ControllerPdfExtensions.cs

using System.IO;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.Extensions.FileProviders;
using Syncfusion.Drawing;
using Syncfusion.HtmlConverter;
using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;

namespace gehGassi.Web.Helper
{
    /// <summary>
    /// Erweiterungen um aus einem View ein PDF zu erstellen
    /// </summary>
    public static class ControllerPdfExtensions
    {
        public static byte[] GetPdf(this ControllerContext context, IUrlHelperFactory factory, IWebHostEnvironment env, string controller, string action, object routeValues)
        {
            var urlHelper = factory.GetUrlHelper(context);
            var address = urlHelper.Action(action, controller, routeValues);
            address = $"{context.HttpContext.Request.Scheme}://{context.HttpContext.Request.Host}{address}";

            var htmlConverter = new HtmlToPdfConverter(HtmlRenderingEngine.WebKit)
            {
                ConverterSettings = new WebKitConverterSettings()
                {
                    WebKitPath = Path.Combine(env.ContentRootPath, "QtBinariesWindows"),
                    PdfPageSize = PdfPageSize.A4,
                    Margin = new PdfMargins() { All = 36f },
                    WebKitViewPort = new Size(896, 0),
                    DisableWebKitWarning = true
                }
            };
            var pdfDocument = htmlConverter.Convert(address);

            var outputStream = new MemoryStream();
            pdfDocument.Save(outputStream);
            outputStream.Position = 0;
            return outputStream.ToArray();
        }

        public static byte[] GetPdfWithHeaderAndFooter(this ControllerContext context, IUrlHelperFactory factory, IWebHostEnvironment env, string controller, string action, object routeValues)
        {
            var urlHelper = factory.GetUrlHelper(context);
            var address = urlHelper.Action(action, controller, routeValues);
            address = $"{context.HttpContext.Request.Scheme}://{context.HttpContext.Request.Host}{address}";

            var htmlConverter = new HtmlToPdfConverter(HtmlRenderingEngine.WebKit)
            {
                ConverterSettings = new WebKitConverterSettings()
                {
                    WebKitPath = Path.Combine(env.ContentRootPath, "QtBinariesWindows"),
                    PdfPageSize = PdfPageSize.A4,
                    Margin = new PdfMargins() { All = 36f },
                    WebKitViewPort = new Size(896, 0),
                    PdfHeader = AddPdfHeader(PdfPageSize.A4.Width, env),
                    PdfFooter = AddPdfFooter(PdfPageSize.A4.Width, env),
                    DisableWebKitWarning = true
                }
            };
            var pdfDocument = htmlConverter.Convert(address);

            var outputStream = new MemoryStream();
            pdfDocument.Save(outputStream);
            outputStream.Position = 0;
            return outputStream.ToArray();
        }

        private static PdfPageTemplateElement AddPdfHeader(float width, IWebHostEnvironment env)
        {
            RectangleF rect = new RectangleF(0, 0, width, 75);
            //Create a new instance of PdfPageTemplateElement class.     
            PdfPageTemplateElement header = new PdfPageTemplateElement(rect);
            PdfGraphics g = header.Graphics;

            var fileName = Path.Combine(env.WebRootPath, "images", "invoice_logo.png");
            using var fileStram = File.OpenRead(fileName);
            var image = new PdfBitmap(fileStram);

            g.DrawImage(image, 214,0, 167, 50);

            return header;
        }

        private static PdfPageTemplateElement AddPdfFooter(float width, IWebHostEnvironment env)
        {
            RectangleF rect = new RectangleF(0, 0, width, 50);
            //Create a new instance of PdfPageTemplateElement class.
            PdfPageTemplateElement footer = new PdfPageTemplateElement(rect);
            PdfGraphics g = footer.Graphics;

            var fileName = Path.Combine(env.WebRootPath, "images", "invoice_icon.png");
            using var fileStram = File.OpenRead(fileName);
            var image = new PdfBitmap(fileStram);

            g.DrawImage(image, 0, 0, 22, 25);
            g.DrawImage(image, 570, 0, 22, 25);

            PdfFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 8);
            g.DrawString("gehgassi GmbH | c/o frebels | Judengasse 12/2 | 5020 Salzburg | office@gehgassi.com | www.gehgassi.com\n\rFN 580181h | UID: ATU77335634 | Sparkasse Kufstein | IBAN: AT39 2050 6077 0015 5083 | BIC: SPKUAT22XXX", font, PdfBrushes.Black, new RectangleF(0,0,595,50), new PdfStringFormat(PdfTextAlignment.Center));

            return footer;
        }
    }
}