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   源码介绍

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

namespace PrintText
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.RichTextBox richTextBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		private System.Drawing.Printing.PrintDocument printDocument1;
		//记录打印行数
		private int i=0;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.Button button4;
		private System.Windows.Forms.Button button5;
		private System.Windows.Forms.PrintPreviewDialog printPreviewDialog1;
		private System.Windows.Forms.PageSetupDialog pageSetupDialog1;
		private System.Windows.Forms.PrintDialog printDialog1;
		/// <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.label1 = new System.Windows.Forms.Label();
			this.richTextBox1 = new System.Windows.Forms.RichTextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.printDocument1 = new System.Drawing.Printing.PrintDocument();
			this.button3 = new System.Windows.Forms.Button();
			this.button4 = new System.Windows.Forms.Button();
			this.button5 = new System.Windows.Forms.Button();
			this.printPreviewDialog1 = new System.Windows.Forms.PrintPreviewDialog();
			this.pageSetupDialog1 = new System.Windows.Forms.PageSetupDialog();
			this.printDialog1 = new System.Windows.Forms.PrintDialog();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(8, 8);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(304, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "文件内容：";
			// 
			// richTextBox1
			// 
			this.richTextBox1.Location = new System.Drawing.Point(8, 24);
			this.richTextBox1.Name = "richTextBox1";
			this.richTextBox1.Size = new System.Drawing.Size(320, 144);
			this.richTextBox1.TabIndex = 1;
			this.richTextBox1.Text = "";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(8, 176);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(64, 23);
			this.button1.TabIndex = 2;
			this.button1.Text = "浏览文件";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(72, 176);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(64, 23);
			this.button2.TabIndex = 3;
			this.button2.Text = "打印文件";
			this.button2.Click  = new System.EventHandler(this.button2_Click);
			// 
			// openFileDialog1
			// 
			this.openFileDialog1.Filter = "所有文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";
			// 
			// printDocument1
			// 
			this.printDocument1.PrintPage  = new System.Drawing.Printing.PrintPageEventHandler(this.printDocument1_PrintPage);
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(136, 176);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(64, 23);
			this.button3.TabIndex = 4;
			this.button3.Text = "打印预览";
			this.button3.Click  = new System.EventHandler(this.button3_Click);
			// 
			// button4
			// 
			this.button4.Location = new System.Drawing.Point(200, 176);
			this.button4.Name = "button4";
			this.button4.Size = new System.Drawing.Size(64, 23);
			this.button4.TabIndex = 5;
			this.button4.Text = "页面设置";
			this.button4.Click  = new System.EventHandler(this.button4_Click);
			// 
			// button5
			// 
			this.button5.Location = new System.Drawing.Point(264, 176);
			this.button5.Name = "button5";
			this.button5.Size = new System.Drawing.Size(64, 23);
			this.button5.TabIndex = 6;
			this.button5.Text = "打印设置";
			this.button5.Click  = new System.EventHandler(this.button5_Click);
			// 
			// 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(299, 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;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(336, 206);
			this.Controls.Add(this.button5);
			this.Controls.Add(this.button4);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.richTextBox1);
			this.Controls.Add(this.label1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示如何实现打印预览";
			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 button1_Click(object sender, System.EventArgs e)
		{//浏览文件内容
			if(this.openFileDialog1.ShowDialog()==DialogResult.OK)
			{
				string MyFileName=this.openFileDialog1.FileName;
				string MyShortFileName=MyFileName.Substring(MyFileName.LastIndexOf("\\") 1);
				this.label1.Text=MyShortFileName "的内容如下：";
				this.richTextBox1.LoadFile(MyFileName,RichTextBoxStreamType.PlainText);
			}
		}

		private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
		{//打印信息处理	
			//获得绘制对象
			Graphics g=e.Graphics;
			//一页中的行数
			float LinePages = 0 ;
			//待绘文本的纵向坐标
			float YPos =  0 ;
			//行计数
			int count = 0 ;
			//左边界
			float LeftMargin = e.MarginBounds.Left;
			//顶边界
			float topMargin = e.MarginBounds.Top;
			//字符串流
			String line=null;		
			//根据页面的高度和字体的高度计算
			//一页中可以打印的行数
			LinePages = e.MarginBounds.Height  / this.Font.GetHeight(g) ;   
			if(i>=this.richTextBox1.Lines.Length-1)
			{
				e.HasMorePages = false ;
				return;
			}
			//每次从文件中读取一行并打印		
			while (count < LinePages && ((line=this.richTextBox1.Lines[i  ]) != null)) 
			{	
				//计算这一行的显示位置
				YPos = topMargin   (count * this.Font.GetHeight(g));
				//绘制文本
				g.DrawString (line, this.Font, Brushes.Black, LeftMargin, YPos, new StringFormat());
				//行数增加
				count  ;
				if(i>this.richTextBox1.Lines.Length-1)
					break;
			}
			//如果有多行，则另外打印一页
			if (line != null)
				e.HasMorePages = true ;
			else
				e.HasMorePages = false ;
		}

		private void button2_Click(object sender, System.EventArgs e)
		{//打印文件
			if(this.richTextBox1.Text.Length<1)
				return;
			i=0;
			try 
			{
 			  this.printDocument1.Print();
			} 	
			catch(Exception error) 
		    {//打印出错处理
			  MessageBox.Show("打印文件发生错误：   "   error.Message,"",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
		}

		private void button3_Click(object sender, System.EventArgs e)
		{//显示打印预览
			if(this.richTextBox1.Text.Length<1)
				return;
			i=0;			
			 //设置Document属性
			this.printPreviewDialog1.Document=this.printDocument1;
			try
			{//显示打印预览窗口
				this.printPreviewDialog1.ShowDialog();
			}
			catch(Exception excep)
			{
				//显示打印出错消息
				MessageBox.Show(excep.Message, "打印出错", MessageBoxButtons.OK,MessageBoxIcon.Error);	
			}		
		}

		private void button4_Click(object sender, System.EventArgs e)
		{//显示页面设置对话框
			if(this.richTextBox1.Text.Length<1)
				return;
			//设置Document属性
			i=0;			
			this.pageSetupDialog1.Document=this.printDocument1;
			try
			{//显示打印页面设置窗口
				this.pageSetupDialog1.ShowDialog();
			}
			catch(Exception excep)
			{//显示打印出错消息
				MessageBox.Show(excep.Message, "打印出错", MessageBoxButtons.OK,MessageBoxIcon.Error);	
			}		
		}

		private void button5_Click(object sender, System.EventArgs e)
		{//显示打印设置对话框
			if(this.richTextBox1.Text.Length<1)
				return;
			i=0;			
			//设置Document属性
			this.printDialog1.Document=this.printDocument1;
			//显示打印窗口
			if(this.printDialog1.ShowDialog()==DialogResult.OK)
			{
				try
				{
					this.printDocument1.Print();
				}
				catch(Exception excep)
				{//显示打印出错消息
					MessageBox.Show(excep.Message, "打印出错", MessageBoxButtons.OK,MessageBoxIcon.Error);	
				}
			}
		}
	}
}