根据第三方库spire.pdf使用指定打印机打印pdf文件

 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();
        
         }

打印输出都是pdf本身的页面设置。以下代码时输出打印机默认的页面设置：

 1.创建PrintDocument组件的对象,

 2.PrintDialog设置对文档进行打印的打印机的参数,对话框的属性Document为指定的PrintDocument类对象，修改的设置将保存到PrintDocument组件对象中.

 3.调用PrintDocument.Print方法来实际打印文档.

  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();

             
        }

参考： http://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/Document-Operation/How-to-print-PDF-files-in-C.html

         http://www.torres.at/pdf-printing-net/

相关dll文件：https://files.cnblogs.com/files/andies/NET4.0.zip