1.封装好的辅助类：
using System; using System.Data; using System.Drawing; using System.Drawing.Printing; using System.Windows.Forms; namespace RC.Finance { /// <summary> /// 打印，打印预览 /// </summary> public class PrintHelper { //以下用户可自定义 //当前要打印文本的字体及字号 private const int HeadHeight = 40; private static readonly Font TableFont = new Font("Verdana", 10, FontStyle.Regular); private readonly SolidBrush _drawBrush = new SolidBrush(Color.Black); //表头字体 private readonly Font _headFont = new Font("Verdana", 20, FontStyle.Bold); //表头文字 private readonly int _yUnit = TableFont.Height * 2; public int TotalNum = 0; //以下为模块内部使用 private DataRow _dataRow; private DataTable _dataTable; private int _firstPrintRecordNumber; private string _headText = string.Empty; private int _pBottom; private int _pHeigh; //当前要所要打印的记录行数,由计算得到 private int _pageLeft; private int _pRight; private int _pageTop; private int _pWidth; private int _pageRecordNumber; private PrintDocument _printDocument; private PageSetupDialog _pageSetupDialog; private int _printRecordComplete; //每页打印的记录条数 private int _printRecordNumber; private int _printingPageNumber = 1; //第一页打印的记录条数 //与列名无关的统计数据行的类目数（如，总计，小计......） private int _totalPage; private int[] _xUnit; /// <summary> /// 打印 /// </summary> /// <param name="dt">要打印的DataTable</param> /// <param name="title">打印文件的标题</param> public void Print(DataTable dt, string title) { try { CreatePrintDocument(dt, title).Print(); } catch (Exception ex) { MessageBox.Show("打印错误，请检查打印设置！"); } } /// <summary> /// 打印预览 /// </summary> /// <param name="dt">要打印的DataTable</param> /// <param name="title">打印文件的标题</param> public void PrintPriview(DataTable dt, string title) { try { var printPriview = new PrintPreviewDialog { Document = CreatePrintDocument(dt, title), WindowState = FormWindowState.Maximized }; printPriview.ShowDialog(); } catch (Exception ex) { MessageBox.Show("打印错误，请检查打印设置！"); } } public void PrintSetting() { try { _pageSetupDialog.ShowDialog(); } catch (Exception ex) { MessageBox.Show("打印错误，请检查打印设置！"); } } /// <summary> /// 创建打印文件 /// </summary> private PrintDocument CreatePrintDocument(DataTable dt, string title) { _dataTable = dt; _headText = title; var pageSetup = new PageSetupDialog(); _printDocument = new PrintDocument { DefaultPageSettings = pageSetup.PageSettings }; _printDocument.DefaultPageSettings.Landscape = true; //设置打印横向还是纵向 //PLeft = 30; //DataTablePrinter.DefaultPageSettings.Margins.Left; _pageTop = _printDocument.DefaultPageSettings.Margins.Top; //PRight = DataTablePrinter.DefaultPageSettings.Margins.Right; _pBottom = _printDocument.DefaultPageSettings.Margins.Bottom; _pWidth = _printDocument.DefaultPageSettings.Bounds.Width; _pHeigh = _printDocument.DefaultPageSettings.Bounds.Height; _xUnit = new int[_dataTable.Columns.Count]; _printRecordNumber = Convert.ToInt32((_pHeigh - _pageTop - _pBottom - _yUnit) / _yUnit); _firstPrintRecordNumber = Convert.ToInt32((_pHeigh - _pageTop - _pBottom - HeadHeight - _yUnit) / _yUnit); if (_dataTable.Rows.Count > _printRecordNumber) { if ((_dataTable.Rows.Count - _firstPrintRecordNumber) % _printRecordNumber == 0) { _totalPage = (_dataTable.Rows.Count - _firstPrintRecordNumber) / _printRecordNumber + 1; } else { _totalPage = (_dataTable.Rows.Count - _firstPrintRecordNumber) / _printRecordNumber + 2; } } else { _totalPage = 1; } _printDocument.PrintPage += PrintDocumentPrintPage; _printDocument.DocumentName = _headText; return _printDocument; } /// <summary> /// 打印当前页 /// </summary> private void PrintDocumentPrintPage(object sende, PrintPageEventArgs @event) { int tableWith = 0; string columnText; var font = new StringFormat { Alignment = StringAlignment.Center }; var pen = new Pen(Brushes.Black, 1);//打印表格线格式 #region 设置列宽 foreach (DataRow dr in _dataTable.Rows) { for (int i = 0; i < _dataTable.Columns.Count; i++) { int colwidth = Convert.ToInt32(@event.Graphics.MeasureString(dr[i].ToString().Trim(), TableFont).Width); if (colwidth > _xUnit[i]) { _xUnit[i] = colwidth; } } } if (_printingPageNumber == 1) { for (int cols = 0; cols <= _dataTable.Columns.Count - 1; cols++) { columnText = _dataTable.Columns[cols].ColumnName.Trim(); int colwidth = Convert.ToInt32(@event.Graphics.MeasureString(columnText, TableFont).Width); if (colwidth > _xUnit[cols]) { _xUnit[cols] = colwidth; } } } for (int i = 0; i < _xUnit.Length; i++) { tableWith += _xUnit[i]; } #endregion _pageLeft = (@event.PageBounds.Width - tableWith) / 2; int x = _pageLeft; int y = _pageTop; int stringY = _pageTop + (_yUnit - TableFont.Height) / 2; int rowOfTop = _pageTop; //第一页 if (_printingPageNumber == 1) { //打印表头 var arr = _headText.Split(new[] { "|" }, StringSplitOptions.RemoveEmptyEntries); if (arr.Length > 1) { @event.Graphics.DrawString(arr[0], _headFont, _drawBrush, new Point(@event.PageBounds.Width / 2, _pageTop), font); } //副标题 var subtitleHeight = 0; for (int i = 1; i < arr.Length; i++) { @event.Graphics.DrawString(arr[i], new Font("Verdana", 12, FontStyle.Regular), _drawBrush, new Point(@event.PageBounds.Width / 2, _pageTop + _headFont.Height), font); subtitleHeight += new Font("Verdana", 12, FontStyle.Regular).Height; } //设置为第一页时行数 if (_dataTable.Rows.Count < _firstPrintRecordNumber) { _pageRecordNumber = _dataTable.Rows.Count; } else { _pageRecordNumber = _firstPrintRecordNumber; } rowOfTop = y = (_pageTop + _headFont.Height + subtitleHeight + 10); stringY = _pageTop + _headFont.Height + subtitleHeight + 10 + (_yUnit - TableFont.Height) / 2; } else { //计算,余下的记录条数是否还可以在一页打印,不满一页时为假 if (_dataTable.Rows.Count - _printRecordComplete >= _printRecordNumber) { _pageRecordNumber = _printRecordNumber; } else { _pageRecordNumber = _dataTable.Rows.Count - _printRecordComplete; } } #region 列名 if (_printingPageNumber == 1 || _pageRecordNumber > TotalNum) //最后一页只打印统计行时不打印列名 { //得到datatable的所有列名 for (int cols = 0; cols <= _dataTable.Columns.Count - 1; cols++) { columnText = _dataTable.Columns[cols].ColumnName.Trim(); int colwidth = Convert.ToInt32(@event.Graphics.MeasureString(columnText, TableFont).Width); @event.Graphics.DrawString(columnText, TableFont, _drawBrush, x, stringY); x += _xUnit[cols]; } } #endregion @event.Graphics.DrawLine(pen, _pageLeft, rowOfTop, x, rowOfTop); stringY += _yUnit; y += _yUnit; @event.Graphics.DrawLine(pen, _pageLeft, y, x, y); //当前页面已经打印的记录行数 int printingLine = 0; while (printingLine < _pageRecordNumber) { x = _pageLeft; //确定要当前要打印的记录的行号 _dataRow = _dataTable.Rows[_printRecordComplete]; for (int cols = 0; cols <= _dataTable.Columns.Count - 1; cols++) { @event.Graphics.DrawString(_dataRow[cols].ToString().Trim(), TableFont, _drawBrush, x, stringY); x += _xUnit[cols]; } stringY += _yUnit; y += _yUnit; @event.Graphics.DrawLine(pen, _pageLeft, y, x, y); printingLine += 1; _printRecordComplete += 1; if (_printRecordComplete >= _dataTable.Rows.Count) { @event.HasMorePages = false; _printRecordComplete = 0; } } @event.Graphics.DrawLine(pen, _pageLeft, rowOfTop, _pageLeft, y); x = _pageLeft; for (int cols = 0; cols < _dataTable.Columns.Count; cols++) { x += _xUnit[cols]; @event.Graphics.DrawLine(pen, x, rowOfTop, x, y); } _printingPageNumber += 1; if (_printingPageNumber > _totalPage) { @event.HasMorePages = false; _printingPageNumber = 1; _printRecordComplete = 0; } else { @event.HasMorePages = true; } } } } 2.调用方法：打印：new PrintHelper().Print(dataTable,title);
预览：new PrintHelper().PrintPriview(dataTable,title);
3.效果：
