form1.cs

《c#技术内幕代码》

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

namespace CH14_2
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.RichTextBox richTextBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		private System.Drawing.Printing.PrintDocument ThePrintDocument = null;
		private System.IO.StringReader myStringReader = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			ThePrintDocument = new System.Drawing.Printing.PrintDocument();
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.richTextBox1 = new System.Windows.Forms.RichTextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// richTextBox1
			// 
			this.richTextBox1.Location = new System.Drawing.Point(88, 24);
			this.richTextBox1.Name = "richTextBox1";
			this.richTextBox1.Size = new System.Drawing.Size(352, 296);
			this.richTextBox1.TabIndex = 0;
			this.richTextBox1.Text = "richTextBox1";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(112, 352);
			this.button1.Name = "button1";
			this.button1.TabIndex = 1;
			this.button1.Text = "&Preview";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(296, 352);
			this.button2.Name = "button2";
			this.button2.TabIndex = 2;
			this.button2.Text = "&Close";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(512, 397);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.button2,
																		  this.button1,
																		  this.richTextBox1});
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			Close();
		}

		protected void PrintPage (object sender, System.Drawing.Printing.PrintPageEventArgs ev)
		{
			float linesPerPage = 0;
			float yPosition = 0;
			int count = 0;
			float leftMargin = ev.MarginBounds.Left;
			float topMargin = ev.MarginBounds.Top; 
			string line = null;
			Font printFont = this.richTextBox1.Font;
			SolidBrush myBrush = new SolidBrush(Color.Black);

			linesPerPage = ev.MarginBounds.Height / printFont.GetHeight(ev.Graphics);
			while(count < linesPerPage && ((line=myStringReader.ReadLine()) != null))
			{
				yPosition = topMargin + (count * printFont.GetHeight(ev.Graphics));
				ev.Graphics.DrawString(line, printFont, myBrush, leftMargin, yPosition, new StringFormat());
				count++;
			}

		
			if  (line != null)
				ev.HasMorePages = true;
			else
				ev.HasMorePages = false;

			myBrush.Dispose();
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			ThePrintDocument.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(PrintPage);
			try
			{
				string strText = this.richTextBox1.Text;      // read string from editor window
				myStringReader = new System.IO.StringReader(strText);
				PrintPreviewDialog printPreviewDialog1 = new PrintPreviewDialog();  // instantiate new print preview dialog
				printPreviewDialog1.Document = this.ThePrintDocument ;
				printPreviewDialog1.BorderStyle = FormBorderStyle.Fixed3D ;
				printPreviewDialog1.ShowDialog();   // Show the print preview dialog, uses print page event to draw preview screen
			}
			catch(Exception exp)
			{
				System.Console.WriteLine(exp.Message.ToString());
			} 
		}

	}
}