winform 打印预览 无法分页

Question

用e.HasMorePages = true  控制分页，但是每页只显示一条就可以分页，如果控制为每页显示三条，无法分页。
代码如下using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using xsgl;namespace winTest
{
    public partial class Form1 : Form
    {
        Class1 obj = new Class1();
        DataSet ds = new DataSet();
        int _curRow=0;        public Form1()
        {
            InitializeComponent();
            this.printDialog1.Document = this.printDocument1;//必要的 
            this.printPreviewDialog1.Document = this.printDocument1;
            this.pageSetupDialog1.Document = this.printDocument1; 
        }        private void Form1_Load(object sender, EventArgs e)
        {
            string sql1 = "select * from zm where zh<>12";
            ds = obj.SelectSqlRows(sql1, "zm");            DataTable dt = ds.Tables[0];
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                string zm = dt.Rows[i]["zm"].ToString();
                toolStripComboBox1.Items.Add(zm.ToString());
            }
            
        }        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            //双击printDocument控件，这才是真正开始干活的，在这里面写你想要打印信息 
            Font font = new Font("Tahoma", 12, FontStyle.Regular);//设置画笔 
            Brush bru = Brushes.Black;
            Pen pen = new Pen(bru);
            pen.Width = 1;            //设置各边距
            int nLeft = this.pageSetupDialog1.PageSettings.Margins.Left;
            int nTop = this.pageSetupDialog1.PageSettings.Margins.Top;
            int nRight = this.pageSetupDialog1.PageSettings.Margins.Right;
            int nBottom = this.pageSetupDialog1.PageSettings.Margins.Bottom;
            int nWidth = this.pageSetupDialog1.PageSettings.PaperSize.Width - nRight - nLeft;
            int nHeight = this.pageSetupDialog1.PageSettings.PaperSize.Height - nTop - nBottom;
            //打印各边距
            int x = 0;
            int y = -1;            for (int i = _curRow; i <= 9; i++)
            {
                if (i % 3 == 0)
                {
                    x = 0;
                }
                else
                {
                    x++;
                }                if (i % 3 == 0)
                {
                    y++;
                }
                else
                {
                }
                DataTable dt = ds.Tables[0];
                e.Graphics.DrawRectangle(pen, nLeft + x * 270, nTop + y * 520, 250, 500);
                e.Graphics.DrawString(dt.Rows[i]["zm"].ToString(), font, bru, nLeft + x * 270, nTop + y * 520 + 20);//如果要打印datagridView在这里遍历便可
                e.Graphics.DrawString("部门", font, bru, nLeft + x * 270, nTop + y * 520 + 40);//如果要打印datagridView在这里遍历便可
                e.Graphics.DrawString("单位", font, bru, nLeft + x * 270 + 50, nTop + y * 520 + 40);//内容在现有的基础上加50
                e.Graphics.DrawString("序号", font, bru, nLeft + x * 270, nTop + y * 520 + 60);//如果要打印datagridView在这里遍历便可
                e.Graphics.DrawString("部门", font, bru, nLeft + x * 270 + 50, nTop + y * 520 + 60);//内容在现有的基础上加50
                if (_curRow == 3)
                {
                    e.HasMorePages = false;
                }
                else
                {
                    if(i % 3==0)
                    {
                    e.HasMorePages = true;
                    }
                }
                    _curRow++;
            }
        }        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            this.printPreviewDialog1.ShowDialog(); //打印预览
        }        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            this.pageSetupDialog1.ShowDialog(); //打印设置
        }        private void toolStripButton3_Click(object sender, EventArgs e)
        {
            if (this.printDialog1.ShowDialog() == DialogResult.OK)//打印
                this.printDocument1.Print();
        }
        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            //双击printDocument控件，这才是真正开始干活的，在这里面写你想要打印信息 
            Font font = new Font("Tahoma", 12, FontStyle.Regular);//设置画笔 
            Brush bru = Brushes.Black;
            Pen pen = new Pen(bru);
            pen.Width = 1;
            //设置各边距 
            int nLeft = this.pageSetupDialog1.PageSettings.Margins.Left;
            int nTop = this.pageSetupDialog1.PageSettings.Margins.Top;
            int nRight = this.pageSetupDialog1.PageSettings.Margins.Right;
            int nBottom = this.pageSetupDialog1.PageSettings.Margins.Bottom;
            int nWidth = this.pageSetupDialog1.PageSettings.PaperSize.Width - nRight - nLeft;
            int nHeight = this.pageSetupDialog1.PageSettings.PaperSize.Height - nTop - nBottom;
            //打印各边距
            int x = 0;
            int y = -1;
            for (int i = 0; i <= 9; i++)
            {
                if (i % 3 == 0)
                {
                    x = 0;
                }
                else
                {
                    x++;
                }                if (i % 3 == 0)
                {
                    y++;
                }
                else
                {
                }
                DataTable dt = ds.Tables[0];
                e.Graphics.DrawRectangle(pen, nLeft + x * 270, nTop + y * 520, 250, 500);
                e.Graphics.DrawString(dt.Rows[i]["zm"].ToString(), font, bru, nLeft + x * 270, nTop + y * 520 + 20);//如果要打印datagridView在这里遍历便可
                e.Graphics.DrawString("部门", font, bru, nLeft + x * 270, nTop + y * 520 + 40);//如果要打印datagridView在这里遍历便可
                e.Graphics.DrawString("单位", font, bru, nLeft + x * 270 + 50, nTop + y * 520 + 40);//内容在现有的基础上加50
                e.Graphics.DrawString("序号", font, bru, nLeft + x * 270, nTop + y * 520 + 60);//如果要打印datagridView在这里遍历便可
                e.Graphics.DrawString("部门", font, bru, nLeft + x * 270 + 50, nTop + y * 520 + 60);//内容在现有的基础上加50            }
        }    }
}

Answer 1

if (_curRow == 3)
  {
  e.HasMorePages = false;
  }
这个是不是有问题

Answer 2

加断点，测试了，但是就是不知道为什么e.HasMorePages = true  不起作用。

Answer 3

for (int i = _curRow; i <= 9; i++)
if (_curRow == 3)
  {
  e.HasMorePages = false;
  }
  else
  {
  if(i % 3==0)
  {
  e.HasMorePages = true;
  }
  }
  _curRow++;
  }
  }这些代码都有问题，好好的想一下吧

Answer 4

if (_curRow == 3)
这块应该是9