有谁知道一些C#中有关printDocument的知识。

MSDN源码
　　using System;
　　using System.IO;
　　using System.Drawing;
　　using System.Drawing.Printing;
　　using System.Windows.Forms;

　　public class PrintingExample : System.Windows.Forms.Form
　　{
　　private System.ComponentModel.Container components;
　　private System.Windows.Forms.Button printButton;
　　private Font printFont;
　　private StreamReader streamToPrint;

　　public PrintingExample() : base()
　　{
　　// The Windows Forms Designer requires the following call.
　　InitializeComponent();
　　}

　　// The Click event is raised when the user clicks the Print button.
　　private void printButton_Click(object sender, EventArgs e)
　　{
　　try
　　{
　　streamToPrint = new StreamReader
　　("C:\\My Documents\\MyFile.txt");
　　try
　　{
　　printFont = new Font("Arial", 10);
　　PrintDocument pd = new PrintDocument();
　　pd.Pr