C# 打印DataTable

public   class  PrintFunction
     ... {
        public String printName = String.Empty;
        public Font prtTextFont = new Font("Verdana", 10);
        public Font prtTitleFont = new Font("宋体", 10);
        private String[] titles = new String[0]; 
        public String[] Titles
        ...{
            set
            ...{
                titles = value as String[];
                if (null == titles)
                ...{
                    titles = new String[0];
                }
            }
            get
            ...{
                return titles;
            }
        }
        private Int32 left = 20;
        private Int32 top = 20;
        public Int32 Top
        ...{
            set
            ...{
                top = value;                
            }
            get
            ...{
                return top;
            }
        }
        public Int32 Left
        ...{
            set
            ...{
                left = value;
            }
            get
            ...{
                return left;
            }
        }
        private DataTable printedTable;
        private Int32 pheight;
        private Int32 pWidth;
        private Int32 pindex;
        private Int32 curdgi;
        private Int32[] width;
        private Int32 rowOfDownDistance = 3;
        private Int32 rowOfUpDistance = 2;
        public Boolean PrintDataTable(DataTable table)
        ...{
            PrintDocument prtDocument = new PrintDocument();
            try
            ...{
                if (printName != String.Empty)
                ...{
                    prtDocument.PrinterSettings.PrinterName = printName;
                }
                prtDocument.DefaultPageSettings.Landscape = true;
                prtDocument.OriginAtMargins = false;
                PrintDialog prtDialog = new PrintDialog();
                prtDialog.AllowSomePages = true;

                prtDialog.ShowHelp = false;
                prtDialog.Document = prtDocument;

                if (DialogResult.OK != prtDialog.ShowDialog())
                ...{
                    return false;
                }

                printedTable = table;
                pindex = 0;
                curdgi = 0;
                width = new Int32[printedTable.Columns.Count];
                pheight = prtDocument.PrinterSettings.DefaultPageSettings.Bounds.Bottom;
                pWidth = prtDocument.PrinterSettings.DefaultPageSettings.Bounds.Right;

                prtDocument.PrintPage += new PrintPageEventHandler(Document_PrintPage);

                prtDocument.Print();

            }
            catch( InvalidPrinterException ex )
            ...{
                MessageBox.Show("没有安装打印机");
            }
            catch (Exception ex)
            ...{
                MessageBox.Show("打印错误");
            }
            prtDocument.Dispose();
            return true;
        }

        Int32 startColumnControls = 0;
        Int32 endColumnControls = 0;
        private void Document_PrintPage(object sender, PrintPageEventArgs ev)
        ...{
            Int32 x = left;
            Int32 y = top;
            Int32 rowOfTop = top;
            Int32 i;
            Pen pen = new Pen(Brushes.Black, 1);
            if (0 == pindex)
            ...{
                for (i = 0; i < titles.Length; i++)
                ...{
                    ev.Graphics.DrawString(titles[i], prtTitleFont, Brushes.Black, left, y + rowOfUpDistance);
                    y += prtTextFont.Height + rowOfDownDistance;
                }
                rowOfTop = y;
                foreach(DataRow dr in printedTable.Rows)
                ...{
                    for (i = 0; i < printedTable.Columns.Count; i++)
                    ...{
                        Int32 colwidth = Convert.ToInt16(ev.Graphics.MeasureString(dr[i].ToString().Trim(), prtTextFont).Width);
                        if (colwidth>width[i])
                        ...{
                            width[i] = colwidth;
                        }
                    }
                }
            }
            for (i = endColumnControls; i < printedTable.Columns.Count; i++)
            ...{
                String headtext = printedTable.Columns[i].ColumnName.Trim();
                if (pindex == 0)
                ...{
                    int colwidth = Convert.ToInt16(ev.Graphics.MeasureString(headtext, prtTextFont).Width);
                    if (colwidth > width[i])
                    ...{
                        width[i] = colwidth;
                    }
                }
                if (x + width[i] > pheight)
                ...{
                    break;
                }
                ev.Graphics.DrawString(headtext, prtTextFont, Brushes.Black, x, y + rowOfUpDistance);
                x += width[i];
            }
            startColumnControls = endColumnControls;
            if (i < printedTable.Columns.Count)
            ...{
                endColumnControls = i;
                ev.HasMorePages = true;
            }
            else
            ...{   
                endColumnControls = printedTable.Columns.Count;
            }
            ev.Graphics.DrawLine(pen, left, rowOfTop, x, rowOfTop);
            y += rowOfUpDistance + prtTextFont.Height + rowOfDownDistance;
            ev.Graphics.DrawLine(pen, left, y, x, y);
            for (i = curdgi; i < printedTable.Rows.Count; i++)
            ...{
                x = left;
                for (Int32 j = startColumnControls; j < endColumnControls; j++)
                ...{
                    ev.Graphics.DrawString(printedTable.Rows[i][j].ToString().Trim(), prtTextFont, Brushes.Black, x, y + rowOfUpDistance);
                    x += width[j];
                }
                y += rowOfUpDistance + prtTextFont.Height + rowOfDownDistance;
                ev.Graphics.DrawLine(pen, left, y, x, y);
                if (y > pWidth - prtTextFont.Height - 30)
                ...{
                    break;
                }
            }
            ev.Graphics.DrawLine(pen, left, rowOfTop, left, y);
            x = left;
            for (Int32 k = startColumnControls; k < endColumnControls; k++)
            ...{
                x += width[k];
                ev.Graphics.DrawLine(pen, x, rowOfTop, x, y);
            }
            if (y > pWidth - prtTextFont.Height - 30)
            ...{
                pindex++;
                if (0 != startColumnControls)
                ...{
                    curdgi = i + 1;
                }
                if (!ev.HasMorePages)
                ...{
                    endColumnControls = 0;
                }
                ev.HasMorePages = true;
            }
        }
        public void PrintPreviewDataTable(DataTable prtTable)
        ...{
            PrintDocument prtDocument = new PrintDocument();
            try
            ...{
                if (printName != String.Empty)
                ...{
                    prtDocument.PrinterSettings.PrinterName = printName;

                }
                prtDocument.DefaultPageSettings.Landscape = true;
                prtDocument.OriginAtMargins = false;
                printedTable = prtTable;
                pindex = 0;
                curdgi = 0;
                width = new int[printedTable.Columns.Count];
                pheight = prtDocument.PrinterSettings.DefaultPageSettings.Bounds.Bottom;
                pWidth = prtDocument.PrinterSettings.DefaultPageSettings.Bounds.Right;
                prtDocument.PrintPage += new PrintPageEventHandler(Document_PrintPage);
                PrintPreviewDialog prtPreviewDialog = new PrintPreviewDialog();
                prtPreviewDialog.Document = prtDocument;
                prtPreviewDialog.ShowIcon = false;
                prtPreviewDialog.WindowState = FormWindowState.Maximized;
                prtPreviewDialog.ShowDialog();

            }
            catch (InvalidPrinterException ex)
            ...{
                MessageBox.Show("没有安装打印机");
            }
            catch (Exception ex)
            ...{
                MessageBox.Show("打印预览失败");
            }

        }
    }

以上代码没有对  当列的长度操作1页的情况，进行考虑。