c# 無彈窗调用打印机

 using System;
 using System.Collections.Generic;
 using System.Text;
 using System.Configuration;
 using System.Web;
 using System.Web.Security;
 using System.Web.UI;
 using System.Web.UI.HtmlControls;
 using System.Web.UI.WebControls;
 using System.Web.UI.WebControls.WebParts;
 using System.Drawing;
 using System.IO;

 namespace Comm
 {
     public class Printer
     {
         private Font printFont;
         private Font titleFont;
         private StringReader streamToPrint;
         ;

         /// <summary>
         /// 设置PrintDocument 的相关属性
         /// </summary>
         /// <param name="str">要打印的字符串</param>
         public void print(string str)
         {
             try
             {
                 streamToPrint = new StringReader(str);
                 printFont = );
                 titleFont = );
                 System.Drawing.Printing.PrintDocument pd = new System.Drawing.Printing.PrintDocument();
                 pd.DocumentName = pd.PrinterSettings.MaximumCopies.ToString();
                 pd.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.pd_PrintPage);

                 pd.PrintController = new System.Drawing.Printing.StandardPrintController();
                 pd.Print();
             }
             catch (Exception ex)
             {
                 throw ex;
             }
         }

         private void pd_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs ev)
         {
             ;
             ;
             ;
             float leftMargin = this.leftMargin;
             ;
             String line = null;
             linesPerPage = ev.MarginBounds.Height / printFont.GetHeight(ev.Graphics);
             while (count < linesPerPage &&
             ((line = streamToPrint.ReadLine()) != null))
             {
                 )
                 {
                     yPos = topMargin + (count * printFont.GetHeight(ev.Graphics));
                     ev.Graphics.DrawString(line, titleFont, Brushes.Black, leftMargin + , yPos, new StringFormat());
                 }
                 else
                 {
                     yPos = topMargin + (count * printFont.GetHeight(ev.Graphics));
                     ev.Graphics.DrawString(line, printFont, Brushes.Black, leftMargin, yPos, new StringFormat());
                 }
                 count++;
             }
             if (line != null)
                 ev.HasMorePages = true;
             else
                 ev.HasMorePages = false;

         }
     }
 }