C# PrintDocument 打印表格

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：