学习笔记（一）没怎么加注释 再说吧

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Printing;

namespace print_test
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.PrintDialog printDialog1;
  private System.Windows.Forms.PrintPreviewDialog printPreviewDialog1;
  private System.Windows.Forms.Button button1;
  private System.Windows.Forms.RichTextBox richTextBox1;
  private System.Windows.Forms.Button button2;
  private PrintDocument pd ;
  private int k;
  private int i;
  private int n;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
   this.printDialog1 = new System.Windows.Forms.PrintDialog();
   this.printPreviewDialog1 = new System.Windows.Forms.PrintPreviewDialog();
   this.button1 = new System.Windows.Forms.Button();
   this.richTextBox1 = new System.Windows.Forms.RichTextBox();
   this.button2 = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // printPreviewDialog1
   //
   this.printPreviewDialog1.AutoScrollMargin = new System.Drawing.Size(0, 0);
   this.printPreviewDialog1.AutoScrollMinSize = new System.Drawing.Size(0, 0);
   this.printPreviewDialog1.ClientSize = new System.Drawing.Size(400, 300);
   this.printPreviewDialog1.Enabled = true;
   this.printPreviewDialog1.Icon = ((System.Drawing.Icon)(resources.GetObject("printPreviewDialog1.Icon")));
   this.printPreviewDialog1.Location = new System.Drawing.Point(129, 17);
   this.printPreviewDialog1.MinimumSize = new System.Drawing.Size(375, 250);
   this.printPreviewDialog1.Name = "printPreviewDialog1";
   this.printPreviewDialog1.TransparencyKey = System.Drawing.Color.Empty;
   this.printPreviewDialog1.Visible = false;
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(32, 8);
   this.button1.Name = "button1";
   this.button1.TabIndex = 0;
   this.button1.Text = "打印";
   //
   // richTextBox1
   //
   this.richTextBox1.Font = new System.Drawing.Font("宋体", 21.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
   this.richTextBox1.Location = new System.Drawing.Point(24, 48);
   this.richTextBox1.Name = "richTextBox1";
   this.richTextBox1.Size = new System.Drawing.Size(456, 344);
   this.richTextBox1.TabIndex = 1;
   this.richTextBox1.Text = "richTextBox1";
   //
   // button2
   //
   this.button2.Location = new System.Drawing.Point(128, 8);
   this.button2.Name = "button2";
   this.button2.TabIndex = 2;
   this.button2.Text = "打印预览";
   this.button2.Click += new System.EventHandler(this.button2_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(504, 429);
   this.Controls.Add(this.button2);
   this.Controls.Add(this.richTextBox1);
   this.Controls.Add(this.button1);
   this.Name = "Form1";
   this.Text = "Form1";
   this.ResumeLayout(false);

  }
  #endregion

  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }
  private void pd_PrintPage(object sender,PrintPageEventArgs e)
  {
   Graphics g = e.Graphics; //获得绘图对象
   int linesPerPage = 0; //页面的行号
   float yPosition = 0;   //绘制字符串的纵向位置
   float leftMargin = e.MarginBounds.Left; //左边距
   float topMargin = e.MarginBounds.Top; //上边距
   string line = null; //行字符串
      Font printFont = this.richTextBox1.Font; //当前的打印字体
   SolidBrush myBrush = new SolidBrush(Color.Black);//刷子
   linesPerPage = (int)(e.MarginBounds.Height / printFont.GetHeight(g));//每页可打印的行数
   yPosition = topMargin + printFont.GetHeight(g);
      int linecount=this.richTextBox1.Lines.Length;//获得文本的总行数
   int pagecount=0;//获得要打印的页数
   if(linecount>0)
   {
    
    if(linecount%linesPerPage>0)
    {
     pagecount=(int)(linecount/linesPerPage)+1;
    }
    else
    {
           pagecount=(int)(this.richTextBox1.Lines.Length/linesPerPage);
    }
   }
   if(pagecount>1)
   {
    
       int ppp;
    if((linecount-n)>linesPerPage)
    {
     ppp=linesPerPage;
    }
    else
    {
        ppp=linecount-n;
    }
    for(n=k;(n<(ppp+k))&&(this.richTextBox1.Lines[n]!=null);n++)
    {
     line=this.richTextBox1.Lines[n].ToString();
     yPosition = topMargin + ((n-k)*printFont.GetHeight(g));
     g.DrawString(line, printFont, myBrush, leftMargin, yPosition, new StringFormat());
    }
    if((n+1)<linecount)
    {
     e.HasMorePages = true;
     k=n;
     i=n+linesPerPage;
    }
   
    else
    {
     e.HasMorePages = false; 
    }
    
   }
   else
   {
    for(int n=0;n<linecount;n++)
    {
     line=this.richTextBox1.Lines[n].ToString();
     yPosition = topMargin + (n*printFont.GetHeight(g));
     g.DrawString(line, printFont, myBrush, leftMargin, yPosition, new StringFormat());
    }
   }
        

   
   
   

 
  }
  private void button2_Click(object sender, System.EventArgs e)
  {
   pd=new PrintDocument();
   pd.PrintPage+=new PrintPageEventHandler(pd_PrintPage);
   this.printPreviewDialog1.Document=this.pd;
   try
   {
    printPreviewDialog1.ShowDialog();
   }
   catch(Exception excep)
   {
    MessageBox.Show(excep.Message, "打印出错", MessageBoxButtons.OK, MessageBoxIcon.Error);
   }

 
  }
 }
}