c#winform打印类

using  System;
using  System.Collections.Generic;
using  System.Text;
using  System.Windows.Forms;
using  System.Drawing.Printing;
using  System.Drawing;

namespace  Common
{
     ///   <summary>
     ///  
     ///   </summary>
     public   class  Printer
    {
         private  DataGridView dataview;
         private  PrintDocument printDoc;
         // 打印有效区域的宽度
         int  width;
         int  height;
         int  columns;
         double  Rate;
         bool  hasMorePage  =   false ;
         int  currRow  =   0 ;
         int  rowHeight  =   20 ;
         // 打印页数
         int  PageNumber;
         // 当前打印页的行数
         int  pageSize  =   20 ;
         // 当前打印的页码
         int  PageIndex;

         private   int  PageWidth;  // 打印纸的宽度
         private   int  PageHeight;  // 打印纸的高度
         private   int  LeftMargin;  // 有效打印区距离打印纸的左边大小
         private   int  TopMargin; // 有效打印区距离打印纸的上面大小
         private   int  RightMargin; // 有效打印区距离打印纸的右边大小
         private   int  BottomMargin; // 有效打印区距离打印纸的下边大小

         int  rows;

         ///   <summary>
         ///  构造函数
         ///   </summary>
         ///   <param name="dataview"> 要打印的DateGridView </param>
         ///   <param name="printDoc"> PrintDocument用于获取打印机的设置 </param>
         public  Printer(DataGridView dataview, PrintDocument printDoc)
        {
             this .dataview  =  dataview;
             this .printDoc  =  printDoc;
            PageIndex  =   0 ;
             // 获取打印数据的具体行数
             this .rows  =  dataview.RowCount;

             this .columns  =  dataview.ColumnCount;
             // 判断打印设置是否是横向打印
             if  ( ! printDoc.DefaultPageSettings.Landscape)
            {

                PageWidth  =  printDoc.DefaultPageSettings.PaperSize.Width;
                PageHeight  =  printDoc.DefaultPageSettings.PaperSize.Height;

            }
             else
            {

                PageHeight  =  printDoc.DefaultPageSettings.PaperSize.Width;
                PageWidth  =  printDoc.DefaultPageSettings.PaperSize.Height;

            }
            LeftMargin  =  printDoc.DefaultPageSettings.Margins.Left;
            TopMargin  =  printDoc.DefaultPageSettings.Margins.Top;
            RightMargin  =  printDoc.DefaultPageSettings.Margins.Right;
            BottomMargin  =  printDoc.DefaultPageSettings.Margins.Bottom;


            height  =  PageHeight  -  TopMargin  -  BottomMargin  -   2 ;
            width  =  PageWidth  -  LeftMargin  -  RightMargin  -   2 ;

             double  tempheight  =  height;
             double  temprowHeight  =  rowHeight;
             while  ( true )
            {
                 string  temp  =  Convert.ToString(tempheight  /  Math.Round(temprowHeight,  3 ));
                 int  i  =  temp.IndexOf( ' . ' );
                 double  tt  =   100 ;
                 if  (i  !=   - 1 )
                {
                    tt  =  Math.Round(Convert.ToDouble(temp.Substring(temp.IndexOf( ' . ' ))),  3 );
                }
                 if  (tt  <=   0.01 )
                {
                    rowHeight  =  Convert.ToInt32(temprowHeight);
                     break ;
                }
                 else
                {
                    temprowHeight  =  temprowHeight  +   0.01 ;

                }
            }
            pageSize  =  height  /  rowHeight;
             if  ((rows  +   1 )  <=  pageSize)
            {
                pageSize  =  rows  +   1 ;
                PageNumber  =   1 ;
            }
             else
            {
                PageNumber  =  rows  /  (pageSize  -   1 );
                 if  (rows  %  (pageSize  -   1 )  !=   0 )
                {
                    PageNumber  =  PageNumber  +   1 ;
                }

            }


        }


         ///   <summary>
         ///  初始化打印
         ///   </summary>
         private   void  InitPrint()
        {
            PageIndex  =  PageIndex  +   1 ;
             if  (PageIndex  ==  PageNumber)
            {
                hasMorePage  =   false ;
                 if  (PageIndex  !=   1 )
                {
                    pageSize  =  rows  %  (pageSize  -   1 )  +   1 ;
                }
            }
             else
            {
                hasMorePage  =   true ;
            }


        }
         // 打印头
         private   void  DrawHeader(Graphics g)
        {

            Font font  =   new  Font( " 宋体 " ,  12 , FontStyle.Bold);
             int  temptop  =  (rowHeight  /   2 )  +  TopMargin  +   1 ;
             int  templeft  =  LeftMargin  +   1 ;

             for  ( int  i  =   0 ; i  <   this .columns; i ++ )
            {
                 string  headString  =   this .dataview.Columns[i].HeaderText;
                 float  fontHeight  =  g.MeasureString(headString, font).Height;
                 float  fontwidth  =  g.MeasureString(headString, font).Width;
                 float  temp  =  temptop  -  (fontHeight)  /   3 ;
                g.DrawString(headString, font, Brushes.Black,  new  PointF(templeft, temp));
                templeft  =  templeft  +  ( int )( this .dataview.Columns[i].Width  /  Rate)  +   1 ;
            }

        }
         // 画表格
         private   void  DrawTable(Graphics g)
        {

            Rectangle border  =   new  Rectangle(LeftMargin, TopMargin, width, (pageSize)  *  rowHeight);
            g.DrawRectangle( new  Pen(Brushes.Black,  2 ), border);
             for  ( int  i  =   1 ; i  <  pageSize; i ++ )
            {
                 if  (i  !=   1 )
                {
                    g.DrawLine( new  Pen(Brushes.Black,  1 ),  new  Point(LeftMargin  +   1 , (rowHeight  *  i)  +  TopMargin  +   1 ),  new  Point(width  +  LeftMargin, (rowHeight  *  i)  +  TopMargin  +   1 ));
                }
                 else
                {
                    g.DrawLine( new  Pen(Brushes.Black,  2 ),  new  Point(LeftMargin  +   1 , (rowHeight  *  i)  +  TopMargin  +   1 ),  new  Point(width  +  LeftMargin, (rowHeight  *  i)  +  TopMargin  +   1 ));
                }
            }

             // 计算出列的总宽度和打印纸比率
            Rate  =  Convert.ToDouble(GetDateViewWidth())  /  Convert.ToDouble(width);
             int  tempLeft  =  LeftMargin  +   1 ;
             int  endY  =  (pageSize)  *  rowHeight  +  TopMargin;
             for  ( int  i  =   1 ; i  <  columns; i ++ )
            {
                tempLeft  =  tempLeft  +   1   +  ( int )( this .dataview.Columns[i  -   1 ].Width  /  Rate);
                g.DrawLine( new  Pen(Brushes.Black,  1 ),  new  Point(tempLeft, TopMargin),  new  Point(tempLeft, endY));
            }

        }
         /**/
         ///   <summary>
         ///  获取打印的列的总宽度
         ///   </summary>
         ///   <returns></returns>
         private   int  GetDateViewWidth()
        {
             int  total  =   0 ;
             for  ( int  i  =   0 ; i  <   this .columns; i ++ )
            {
                total  =  total  +   this .dataview.Columns[i].Width;
            }
             return  total;
        }

         // 打印行数据
         private   void  DrawRows(Graphics g)
        {

            Font font  =   new  Font( " 宋体 " ,  12 , FontStyle.Regular);
             int  temptop  =  (rowHeight  /   2 )  +  TopMargin  +   1   +  rowHeight;


             for  ( int  i  =  currRow; i  <  pageSize  +  currRow  -   1 ; i ++ )
            {
                 int  templeft  =  LeftMargin  +   1 ;
                 for  ( int  j  =   0 ; j  <  columns; j ++ )
                {
                     string  headString  =   this .dataview.Rows[i].Cells[j].Value.ToString();
                     float  fontHeight  =  g.MeasureString(headString, font).Height;
                     float  fontwidth  =  g.MeasureString(headString, font).Width;
                     float  temp  =  temptop  -  (fontHeight)  /   3 ;
                     while  ( true )
                    {
                         if  (fontwidth  <=  ( int )( this .dataview.Columns[j].Width  /  Rate))
                        {
                             break ;
                        }
                         else
                        {
                            headString  =  headString.Substring( 0 , headString.Length  -   1 );
                            fontwidth  =  g.MeasureString(headString, font).Width;
                        }
                    }
                    g.DrawString(headString, font, Brushes.Black,  new  PointF(templeft, temp));

                    templeft  =  templeft  +  ( int )( this .dataview.Columns[j].Width  /  Rate)  +   1 ;
                }

                temptop  =  temptop  +  rowHeight;


            }
            currRow  =  pageSize  +  currRow  -   1 ;

        }

         ///   <summary>
         ///  在PrintDocument中的PrintPage方法中调用
         ///   </summary>
         ///   <param name="g"> 传入PrintPage中PrintPageEventArgs中的Graphics </param>
         ///   <returns> 是否还有打印页 有返回true，无则返回false </returns>
         public   bool  Print(Graphics g)
        {
            InitPrint();
            DrawTable(g);
            DrawHeader(g);
            DrawRows(g);

             // 打印页码
             string  pagestr  =  PageIndex  +   "  /  "   +  PageNumber;
            Font font  =   new  Font( " 宋体 " ,  12 , FontStyle.Regular);
            g.DrawString(pagestr, font, Brushes.Black,  new  PointF((PageWidth  /   2 )  -  g.MeasureString(pagestr, font).Width, PageHeight  -  (BottomMargin  /   2 )  -  g.MeasureString(pagestr, font).Height));
             // 打印查询的功能项名称
             string  temp  =  dataview.Tag.ToString()  +   "   "   +  DateTime.Now.ToString( " yyyy-MM-dd HH:mm " );
            g.DrawString(temp, font, Brushes.Black,  new  PointF(PageWidth  -   5   -  g.MeasureString(temp, font).Width, PageHeight  -   5   -  g.MeasureString(temp, font).Height));
             return  hasMorePage;
        }

    }
}