How To Convert Html Form Data To Pdf With Hiqpdf Html To Pdf .net Library

This article presents the solution for the following scenario:

Let's say you have filled some values in a HTML form of a web page and you want to convert this web page to PDF preserving the values filled in the form and the ASP.NET Session Data.

In order to capture the values filled in the ASP.NET page, you have to override the Render method of the ASP.NET page to get the HTML code that would be generated during Render phase of the page processing and convert that HTML code to PDF passing the page URL as base URL parameter to the converter.

When a 'Convert This Page to PDF' button in the page is pressed, the convertCrtPageToPdf boolean field is set to true.

This field is checked in the overridden Render method and if it is true then the HTML code is captured, converted to PDF and the generated PDF is sent as response to browser instead of the normal HTML.

The sample code below demonstrates how this procedure works in HiQPdf HTML to PDF Library for .NET .

Full demo source code and details at: HiQPDF HTML to PDF .NET Library

C# code:

using System;

using System.Collections.Generic;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Text;

using System.IO;

using HiQPdf;

namespace HiQPdf_Demo

{

public partial class ConvertHtmlPreservingState : System.Web.UI.Page

{

// a flag to indicate to Render method if the current page

// will be converted to PDF

bool convertCrtPageToPdf = false;

protected void buttonConvertCrtPage_Click(object sender, EventArgs e)

{

// indicate to Render method that the current page

// will be converted to PDF

convertCrtPageToPdf = true;

// save custom value in ASP.NET session variable

Session["SessionVariable"] = textBoxCrtSessionVariable.Text;

// show session variable value

panelSessionVariableValue.Visible = true;

litSessionVariableValue.Text = Session["SessionVariable"].ToString();

}

// override the Render method of the ASP.NET page

protected override void Render(HtmlTextWriter writer)

{

if (convertCrtPageToPdf)

{

// setup a TextWriter to capture the current page HTML code

TextWriter tw = new StringWriter();

HtmlTextWriter htw = new HtmlTextWriter(tw);

// render the HTML markup into the TextWriter

base.Render(htw);

// get the current page HTML code

string htmlCode = tw.ToString();

// convert the HTML code to PDF

// create the HTML to PDF converter

HtmlToPdf htmlToPdfConverter = new HtmlToPdf();

// hide the HTML buttons

htmlToPdfConverter.HiddenHtmlElements = new string[] { "#convertCrtPageDiv"};

// the base URL used to resolve images, CSS and script files

string currentPageUrl = HttpContext.Current.Request.Url.AbsoluteUri;

// convert HTML code to a PDF memory buffer

byte[] pdfBuffer = htmlToPdfConverter.ConvertHtmlToMemory(htmlCode, currentPageUrl);

// inform the browser about the binary data format

HttpContext.Current.Response.AddHeader("Content-Type", "application/pdf");

// let the browser know how to open the PDF document, attachment or inline, and the file name

HttpContext.Current.Response.AddHeader("Content-Disposition",

String.Format("attachment; filename=ConvertThisHtmlWithState.pdf; size={0}", pdfBuffer.Length.ToString()));

// write the PDF buffer to HTTP response

HttpContext.Current.Response.BinaryWrite(pdfBuffer);

// call End() method of HTTP response to stop ASP.NET page processing

HttpContext.Current.Response.End();

}

else

{

base.Render(writer);

}

}

}

}

by: Stephen N.

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