Convert HTML to PDF in ASP.NET MVC Applications with C#

Winnovative HTML to PDF Converter for .NET can be used in ASP.NET MVC applications to convert HTML pages to PDF. The HTML to PDF Converter Package you can download from product website contains a sample a sample application for ASP.NET MVC with full C# source code. Below you can find a sample code from that demo application:

[HttpPost]
public ActionResult ConvertHtmlToPdf(FormCollection collection)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    // Set HTML Viewer width in pixels which is the equivalent in converter of the browser window width
    htmlToPdfConverter.HtmlViewerWidth = int.Parse(collection["htmlViewerWidthTextBox"]);

    // Set HTML viewer height in pixels to convert the top part of a HTML page 
    // Leave it not set to convert the entire HTML
    if (collection["htmlViewerHeightTextBox"].Length > 0)
        htmlToPdfConverter.HtmlViewerHeight = int.Parse(collection["htmlViewerHeightTextBox"]);

    // 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"]);

    // Set the maximum time in seconds to wait for HTML page to be loaded 
    // Leave it not set for a default 60 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"].Length > 0)
        htmlToPdfConverter.ConversionDelay = int.Parse(collection["conversionDelayTextBox"]);

    string url = collection["urlTextBox"];

    // Convert the HTML page given by an URL to a PDF document in a memory buffer
    byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);

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

    return fileResult;
}

The code for MVC is similar with the code for other .NET applications. The difference occurs when sending the resulted PDFto browser. The action of converting the HTML document  to PDF returns a FileResult object.

It is also possible to convert the current page to PDF. The C# code for this is:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

using System.IO;
using System.Text;
using System.Web.UI;

// Use Winnovative Namespace
using Winnovative;

namespace WnvHtmlToPdfMvcDemo.Controllers
{
    public class Convert_Current_PageController : Controller
    {
        public ActionResult Index()
        {
            ViewData.Add("firstName", "John");
            ViewData.Add("lastName", "Smith");
            ViewData.Add("gender", "maleRadioButton");
            ViewData.Add("haveCar", "true");
            ViewData.Add("carType", "Volvo");
            ViewData.Add("comments", "My comments\r\nLine 1\r\nLine 2");

            return View();
        }

        [HttpPost]
        public ActionResult ConvertCurrentPageToPdf(FormCollection collection)
        {
            object model = null;
            ViewDataDictionary viewData = new ViewDataDictionary(model);

            // transmit the posted data to view
            viewData.Add("firstName", collection["firstNameTextBox"]);
            viewData.Add("lastName", collection["lastNameTextBox"]);
            viewData.Add("gender", collection["gender"]);
            viewData.Add("haveCar", collection["haveCarCheckBox"]);
            viewData.Add("carType", collection["carTypeDropDownList"]);
            viewData.Add("comments", collection["commentsTextBox"]);

            // The string writer where to render the HTML code of the view
            StringWriter stringWriter = new StringWriter();

            // Render the Index view in a HTML string
            ViewEngineResult viewResult = ViewEngines.Engines.FindView(ControllerContext, "Index", null);
            ViewContext viewContext = new ViewContext(
                    ControllerContext,
                    viewResult.View,
                    viewData,
                    new TempDataDictionary(),
                    stringWriter
                    );
            viewResult.View.Render(viewContext, stringWriter);

            // Get the view HTML string
            string htmlToConvert = stringWriter.ToString();

            // Get the base URL
            String currentPageUrl = this.ControllerContext.HttpContext.Request.Url.AbsoluteUri;
            String baseUrl = currentPageUrl.Substring(0, currentPageUrl.Length - "Convert_Current_Page/ConvertCurrentPageToPdf".Length);

            // 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 = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=";

            // 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;

            // Convert the HTML string to a PDF document in a memory buffer
            byte[] outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlToConvert, baseUrl);

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

            return fileResult;
        }
    }
}

 

 

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