PDF Print Through Windows Service with C#

I ended up using pdfium to do the job. With that code, the PDF file is sent to the printer correctly even when the windows service is running under the LocalService user.

PrinterSettings printerSettings = new PrinterSettings()
{
    PrinterName = printerName,
    Copies = 1
};

PageSettings pageSettings = new PageSettings(printerSettings)
{
    Margins = new Margins(0, 0, 0, 0)
};

foreach (PaperSize paperSize in printerSettings.PaperSizes)
{
    if (paperSize.PaperName == "A4")
    {
        pageSettings.PaperSize = paperSize;
        break;
    }
}

using (PdfDocument pdfDocument = PdfDocument.Load(filePath))
{
    using (PrintDocument printDocument = pdfDocument.CreatePrintDocument())
    {
        printDocument.PrinterSettings = printerSettings;
        printDocument.DefaultPageSettings = pageSettings;
        printDocument.PrintController = (PrintController) new     StandardPrintController();
        printDocument.Print();
    }
}

Thanks for the answers guys.