不能分页 只有一页-为什么不能分页打印?

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不能分页 只有一页

不能分页 只有一页-为什么不能分页打印? - 摘要: 为什么不能分页打印?这是一个类:usingSystem;usingSystem.Collections.Generic;usingSystem.Text;usingSystem.Drawing.Pri

问题描述

为什么不能分页打印?

这是一个类:
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing.Printing;
using System.Drawing;
using System.Windows.Forms;

namespace schoolInformation
{

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;

    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;


    /**/
    /// <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>   
    public Printer(DataGridView dataview, PrintDocument printDoc)
    {

        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;
        TopMargin = printDoc.DefaultPageSettings.Margins.Top;//上面有装订线
        RightMargin = printDoc.DefaultPageSettings.Margins.Right;
        BottomMargin = printDoc.DefaultPageSettings.Margins.Bottom;


        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>   
    public  bool InitPrint()
    {

        PageIndex = PageIndex + 1;
        MessageBox.Show(PageIndex.ToString());
        if (PageIndex == PageNumber)
        {
            hasMorePage = false;
            if (PageIndex != 1)
            {
                pageSize = rows % (pageSize - 1) + 1;
            }
        }
        else
        {
            hasMorePage = true;
        }

        return hasMorePage;

    }
    //打印头   
    private void DrawHeader(Graphics g)
    {

        Font font = new Font("宋体", 11, FontStyle.Bold);
        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, 2), 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, 2), 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;

        try
        {
            for (int i = currRow; i < pageSize + currRow - 1; 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;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message,"数据错误!",MessageBoxButtons.OK,MessageBoxIcon.Error);
        }

    }

    /**/
    /// <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,string title)
    {
        InitPrint();
        DrawTable(g);
        DrawHeader(g);
        DrawRows(g);



        //打印页码   
        string pagestr = PageIndex + " / " + PageNumber;
        Font font = new Font("宋体", 10, FontStyle.Regular);//页脚字体
        Font font2 = new Font("黑体", 16, FontStyle.Regular);//标题字体
        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   
        //    string temp = dataview.Tag.ToString() + " " + DateTime.Now.ToString("yyyy-MM-dd HH:mm");
        //  string temp = "班级学生成绩";
        string temp = title;
        g.DrawString(temp, font2, Brushes.Black, new PointF(PageWidth / 2 + 15 - g.MeasureString(temp, font).Width, 70));//这是标题
        g.DrawString(temp, font, Brushes.Black, new PointF(PageWidth - 5 - g.MeasureString(temp, font).Width, PageHeight - 5 - g.MeasureString(temp, font).Height));//这是在页脚
        return hasMorePage;





    }



}

}

    private void printDocument_score_PrintPage(object sender, PrintPageEventArgs e)
    {
        //设置 打印内容
        Graphics g = e.Graphics;
        string className = this.className.Text;
        string terme = this.label_termeName.Text;
        string course = this.courseName.Text;
        string title = className + terme + course + "期末成绩";
        Printer p = new Printer(dataGridView_score, printDocument_score);
        p.Print(g, title);

}

为什么打印中有一页,不能分页,请高手指点。

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