C#中PrintDocument列印功能的實現。分頁列印內容控制與排版

   

using System; 
using System.Drawing;  
using System.Drawing.Printing;  
using System.Windows.Forms;  
using System.IO;  
using System.Text;    
namespace Skyiv.Util  {    
sealed class TextFilePrinter    {      
string fileName;      
Encoding theEncode;      
Font theFont;      
StreamReader srToPrint;      
int currPage;        
public TextFilePrinter(
string fileName)        : this(fileName, Encoding.GetEncoding("GB18030"), new Font("新宋體", 10))      {      }        
public TextFilePrinter(string fileName, Encoding theEncode, Font theFont)      {        
this.fileName = fileName;        
this.theEncode = theEncode;        
this.theFont = theFont;      }       
 public void Print()      {        
using (srToPrint = new StreamReader(fileName, theEncode))        {         
 PrintDialog dlg = new PrintDialog();          
dlg.Document = GetPrintDocument();         
 dlg.AllowSomePages = true;          
dlg.AllowPrintToFile = false;          
if (dlg.ShowDialog() == DialogResult.OK) 
dlg.Document.Print();     
   }      
}       
 public void View()      {        
using (srToPrint = new StreamReader(fileName, theEncode))        {    
      PrintPreviewDialog dlg = new PrintPreviewDialog();          
dlg.Document = GetPrintDocument();         
 dlg.ShowDialog();      
  }    
  }      
  PrintDocument GetPrintDocument()      {   
     currPage = 1;        
PrintDocument doc = new PrintDocument();        
doc.DocumentName = fileName;        
doc.PrintPage += new PrintPageEventHandler(PrintPageEvent);        
return doc;      
}        
void PrintPageEvent(object sender, PrintPageEventArgs ev)      {       
 string line = null;        
float linesPerPage = ev.MarginBounds.Height / theFont.GetHeight(ev.Graphics);       
 bool isSomePages = ev.PageSettings.PrinterSettings.PrintRange == PrintRange.SomePages;        
if (isSomePages)        {        
  while (currPage < ev.PageSettings.PrinterSettings.FromPage)          {         
   for (int count = 0; count < linesPerPage; count++)            {              
line = srToPrint.ReadLine();              
if (line == null) break;            }           
 if (line == null) return;            currPage++;          }          
if (currPage > ev.PageSettings.PrinterSettings.ToPage) return;        }        
for (int count = 0; count < linesPerPage; count++)        {         
 line = srToPrint.ReadLine();          if (line == null) break;      
    ev.Graphics.DrawString(line, theFont, Brushes.Black, ev.MarginBounds.Left,          
  ev.MarginBounds.Top + (count * theFont.GetHeight(ev.Graphics)), new StringFormat());        }     
   currPage++;      
  if (isSomePages && currPage > ev.PageSettings.PrinterSettings.ToPage) return;       
 if (line != null) ev.HasMorePages = true;      }    }  }