C#使用iTextSharp从PDF文档获取内容的方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
namespace WindowsFormsApplication1
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
   ExtractTextFromPDFPage("c:sample.pdf",1);
  }
  public void ExtractTextFromPDFPage(string pdfFile,int pageNumber)
  {
   PdfReader reader = new PdfReader(pdfFile);
   string text = PdfTextExtractor.GetTextFromPage(reader,pageNumber);
   try { reader.Close(); }
   catch { }
   richTextBox1.Text = text;
  }
 }
}