private void button1_Click(object sender, EventArgs e)

        {

            PdfDocument doc = new PdfDocument();

            string filePath = "D:\\用户目录\\我的文档\\output2.pdf";

            doc.LoadFromFile(filePath);

            doc.PrinterName = "HP LaserJet M1522 MFP Series PCL 6";

            doc.PrintDocument.Print();

         }

  private void button1_Click(object sender, EventArgs e)

        {

            PdfDocument doc = new PdfDocument();

            string filePath = "D:\\用户目录\\我的文档\\output2.pdf";

            string printername = "HP Universal Printing PCL 6";

            doc.LoadFromFile(filePath);

            PrintDocument(doc, printername);

        }

        private void PrintDocument(PdfDocument doc, string printername)

        {

            PrintDialog dialogPrint = new PrintDialog();

            doc.PrinterName = printername;

            doc.PageScaling = PdfPrintPageScaling.ActualSize;

            //PrintDocument类是实现打印功能的核心，它封装了打印有关的属性、事件、和方法

            PrintDocument printDoc = doc.PrintDocument;

            // 获取PrinterSettings类的PrintDocument对象

            dialogPrint.Document = printDoc;

            printDoc.Print();

        }