打印DataGridView内容的类

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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;        }    }}
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