打印DataGridView内容的类

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Printing;
using System.Drawing;
namespace 数据导出
{
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;
int AreaHeight;
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;
private string[] footer;

/// <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> 
/// <param name="footer">页脚</param>
public Printer(DataGridView dataview, PrintDocument printDoc, string[] footer)
{
this.footer = footer;
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 /*- 50*/;
TopMargin = printDoc.DefaultPageSettings.Margins.Top /*+ 60*/;
RightMargin = printDoc.DefaultPageSettings.Margins.Right;
BottomMargin =
printDoc.DefaultPageSettings.Margins.Bottom - 100;
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", 11, FontStyle.Regular);
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, 1), 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, 1), 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", 11, FontStyle.Regular);
int temptop = (rowHeight / 2) + TopMargin + 1 + rowHeight;
for (int i = currRow; i < pageSize + currRow - 2; 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;
AreaHeight = temptop;
}
/**/
/// <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", 11, 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                     
return hasMorePage;
}
}
}