SelectPdf for .NET 10 - Pdf Watermarks - C# / .NET 10 Sample

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using SelectPdf.Universal;

namespace SelectPdf.Samples.Pages
{
    public class PdfWatermarksModel : PageModel
    {
        public void OnGet()
        {

        }

        public IActionResult OnPost()
        {
            // create a new pdf document
            PdfDocument doc = new PdfDocument();

            // create a new pdf font
            PdfFont font = doc.Fonts.Add(PdfStandardFont.Helvetica);
            font.Size = 24;

            // add a new page to the document
            PdfPage page = doc.AddPage();

            // create a new text element and add it to the page
            PdfTextElement text = new PdfTextElement(0, 0, Helper.SomeLongText(), font);
            page.Add(text);

            // get image path
            string imgFile = Path.Combine(Startup.ServerPath, "wwwroot", "images", "logo.png");

            // watermark all pages - add a template containing an image 
            // to the bottom right of the page
            // the image should repeat on all pdf pages automatically
            // the template should be rendered behind the rest of the page elements
            PdfTemplate template = doc.Templates.Add(doc.Pages[0].ClientRectangle);
            PdfImageElement img = new PdfImageElement(
                doc.Pages[0].ClientRectangle.Width - 300,
                doc.Pages[0].ClientRectangle.Height - 150, imgFile);
            img.Transparency = 50;
            template.Background = true;
            template.Add(img);

            // save pdf document
            byte[] pdf = doc.Save();

            // close pdf document
            doc.Close();

            // return resulted pdf document
            FileResult fileResult = new FileContentResult(pdf, "application/pdf");
            fileResult.FileDownloadName = "Document.pdf";
            return fileResult;

        }
    }
}