SelectPdf for .NET 10 - Partial Page Conversion with Html to Pdf Converter - C# / .NET 10 Sample

This sample shows how the html to pdf converter can be used to convert only a section of a web page using SelectPdf Pdf Library for .NET.

The section of the page that will be converted is identified using a CSS selector - any selector the browser understands, such as #mwDg, .infobox or table.wikitable tbody.

Url:

Rendering Engine:

Render element matching CSS selector:

Sample code · C#

using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using SelectPdf.Universal;

namespace SelectPdf.Samples.Pages
{
    public class PartialConversionModel : PageModel
    {
        public void OnGet()
        {
            DdlRenderingEngine = "Chromium";
        }

        [BindProperty]
        public string TxtUrl { get; set; }

        [BindProperty]
        public string DdlRenderingEngine { get; set; } = "Chromium";

        public List<SelectListItem> RenderingEngines { get; } = new List<SelectListItem>
        {
            new SelectListItem { Value = "Chromium", Text = "Chromium" },
        };

        [BindProperty]
        public string TxtElements { get; set; }


        public IActionResult OnPost()
        {
            RenderingEngine renderingEngine =
                SampleForm.ParseEnum(DdlRenderingEngine, RenderingEngine.Chromium);

            // instantiate a html to pdf converter object
            HtmlToPdf converter = new HtmlToPdf();
            converter.Options.NavigationTimeout = Startup.NavigationTimeout;

            converter.Options.RenderingEngine = renderingEngine;

            // specify the CSS selector of the section that will be converted to pdf - the element is
            // lifted out of the page and rendered on its own, the page width kept and the height
            // trimmed to it
            if (!string.IsNullOrEmpty(TxtElements))
            {
                converter.Options.VisibleWebElementSelector = TxtElements;
            }

            // create a new pdf document converting an url
            PdfDocument doc = converter.ConvertUrl(TxtUrl);

            // 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;

        }
    }
}