关于打印获取自动换行后每行的字符串内容

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.IO;

using System.Drawing.Printing;

using System.Collections;

using System.Drawing.Drawing2D;

using System.Drawing.Text;

namespace WindowsApplication2

{

    public partial class PrintingExample : Form

    {

        public PrintingExample()

        {

            InitializeComponent();

        }

        private System.ComponentModel.Container components;

        private System.Windows.Forms.Button printButton; 

        public static float Scalt=(float)1;

        private Font printFont;

        private StreamReader streamToPrint;

        bool flag = true;

        ArrayList arraylist;

        int count = 0;

        string filePath;

        // The Click event is raised when the user clicks the Print button.

        private void printButton_Click(object sender, EventArgs e)

        {

            this.openFileDialog1.Filter = "Text file(*.txt)|*.txt|All files(*.*)|*.*";

            if (this.openFileDialog1.ShowDialog() == DialogResult.OK)

            {

                try

                {

                    filePath = openFileDialog1.FileName;



                }

                catch (Exception error)

                {

                    MessageBox.Show("错误信息是： " + error.Message, "警告", MessageBoxButtons.OK, MessageBoxIcon.Error);

                }

           



            try

            {

                if(textBox1.Text.Trim() !=null)

                Scalt = float.Parse(textBox1.Text.Trim());

                streamToPrint = new StreamReader

                   (filePath, Encoding.GetEncoding("gb2312"));

                arraylist = new ArrayList();

                count = 0;

                flag = true;

                printFont = new Font("Tahoma", 10 * Scalt);

                try

                {

                    //printFont = new Font("Tahoma", 10 * Scalt);

                    PrintDocument pd = new PrintDocument();

                    pd.PrintPage += new PrintPageEventHandler (this.pd_PrintPage);

                    PrintPreviewDialog dig = new PrintPreviewDialog();

                        dig.Document = pd;

                        dig.ShowDialog();

                    //pd.Print();

                }

                finally

                {

                    streamToPrint.Close();

                }

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message);

            }

        }

        }



        // The PrintPage event is raised for each page to be printed.

        private void pd_PrintPage(object sender, PrintPageEventArgs ev)

        {

            int linesPerPage = (int) (ev.MarginBounds.Height /printFont.GetHeight(ev.Graphics));

            float yPos = 0;

           

            float leftMargin = ev.MarginBounds.Left;

            float topMargin = ev.MarginBounds.Top;

            

            string line = null;

            string linePage=null;

            

            if (flag)

            {

                int FontSize = (int)(ev.PageBounds.Width / ev.Graphics.MeasureString("啊", printFont).Width);

            while (

            ((line = streamToPrint.ReadLine()) != null))

            {

                int rows =line.Length / FontSize;

                int leavings = line.Length % FontSize;

                if (rows > 0)

                {

                    for (int i = 0; i <= rows;i++ )

                    {

                        if (leavings > 0 && i == rows)

                        {

                            linePage = line.Substring(i * FontSize);

                        }

                        else if (leavings ==0 && i==rows)

                        {

                            break;

                        }

                        else

                        {

                            linePage = line.Substring(i * FontSize, FontSize);

                        }

                        arraylist.Add(linePage);

                    }

                }

                else

                {



                    arraylist.Add(line);

                }

            }

            flag = false;

        }

        int page = 0;

        while (

        count < arraylist.Count)

        {

          linePage = (string)arraylist[count];

          yPos = topMargin + (page*

            printFont.GetHeight(ev.Graphics));

            ev.Graphics.DrawString(linePage, printFont, Brushes.Black,

               leftMargin, yPos, new StringFormat());

            count++;

            page++;

             if(((count%linesPerPage)==0)&&(count>=linesPerPage))

             break;

        }

            if (count <arraylist.Count)

                ev.HasMorePages = true;

             

            else

                ev.HasMorePages = false;

        }



        private void PrintingExample_Load(object sender, EventArgs e)

        {

            this.textBox1.Text = "1";

        }



       private void PrintingExample_FormClosed(object sender, FormClosedEventArgs e)

        {

            Application.Exit();

        }





    }

}