How to set the printing paper size

[buWenXin]

The printed paper seems to be A4, how do I set the paper size?
This is my code, I have set the size of the PDF, but it will not affect the paper size.

`var printerName = "pdfFactory Pro";

var printFile = "D:\MyProject\Electron\electron-print\PDF\test04.pdf";

var pdfDocument = PdfDocument.Load(printFile);

var printDocument = pdfDocument.CreatePrintDocument();

var s = printDocument.PrinterSettings = new PrinterSettings()
{
PrinterName = printerName
};

double pdfWidth = 40 / (25.4 / 100);
double pdfHeight = 30 / (25.4 / 100);
printDocument.DefaultPageSettings = new PageSettings()
{
Margins = new Margins(0, 0, 0, 0),
PaperSize = new PaperSize("size", (int)pdfWidth, (int)pdfHeight)
};

PaperSize updatedPaperSize = s.DefaultPageSettings.PaperSize;
Console.WriteLine(updatedPaperSize.Height);
printDocument.PrintController = new StandardPrintController();
printDocument.Print();`

I tried using PrinterSettings.PaperSizes sets the size of the printed paper, but this property is read-only and I cannot set it.

[zhyueyueniao]

设置纸张大小应该是printDocument.PageSettings.PaperSize