'C# HiQ Html to PDF Performance Issue

I'm working on a reporting project in C# that uses Razor pages to generate HTML and HiQ to convert the HTML to PDF. It's been working just fine until we added a new report that has lots of data- the raw data is 2.5mb saved as a text file and the end result is a 5.8m 200 page pdf.

The conversion process is taking unacceptably long for this report- 1.5 minutes. As a test we dropped in the old code that used OpenHtmlToPdf* which ran the same report in 20 seconds.

Is there a way of tweaking our code or the HiQ engine to improve performance?

Our code:

     public Stream ConvertToPdf(string html, ReportSettings reportSettings)
            {
                var htmlToPdf = new HtmlToPdf();
                htmlToPdf.SerialNumber = SerialNumber;
    
                if (reportSettings.Landscape)
                {
                    htmlToPdf.Document.PageOrientation = PdfPageOrientation.Landscape;
                }
                htmlToPdf.Document.PageSize = PdfPageSize.Letter;
                htmlToPdf.Document.Margins = new PdfMargins(25, 25, 15, 15);
    
                SetFooter(htmlToPdf);
    
                var pdfData = htmlToPdf.ConvertHtmlToMemory(html, Url);
                var memoryStream = new MemoryStream(pdfData);
    
                return memoryStream;
            }
  • We switched to HiQ because OpenHtmlToPdf is no longer being updated and doesn't support CSS3.
c++sharphiqpdf


Solution 1:[1]

I finally received a response from the support: my serial is valid for a PREVIOUS version of HiQPdf.

Be aware that in Nuget, the only version available is version 12. To downgrade you need to find a backup of your previous version of HiQPdf.dll and put it manually in you packages.

Below the response from the support:

HiQPdf Sales [email protected] Mon 18/04/2022 18:20

Hello,

Your serial number is for version 10 of the software. For version 12 you need a new serial number.

You can renew the old license with a 20% renewal discount to obtain a serial number for the latest version of the software in the page below: [link removed]

Best Regards,

Jacob

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Emmanuel Gleizer

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