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;  } }}