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 使用专业PDF处理控件activePDF Toolkit可以提供文档信息的检索功能，为用户检索文档信息提供方便快捷的新途径。

》》》下载activePDF Toolkit试用版

示例代码如下：

// Copyright (c) 2013 activePDF, Inc.
// Example created 01/21/13

// Make sure to add the activePDF product .NET DLL(s) to your application.
// .NET DLL(s) are typically found in the products 'bin' folder.

class Examples
{
  public void main()
  {
    string strPath;
    string strAuthor;
    string strTitle;
    string strSubject;
    string strKeywords;
    string strProducer;
    string strCreator;
    string strCreateDate;
    string strModDate;
    
    strPath = AppDomain.CurrentDomain.BaseDirectory;

    // Instantiate Object
    APToolkitNET.Toolkit oTK = new APToolkitNET.Toolkit();
    
    // Specify the file to retrieve information about
    oTK.GetPDFInfo(strPath + "PDF.pdf");
    
    // Retrieve various information about the PDF
    strAuthor = oTK.Author;
    strTitle = oTK.Title;
    strSubject = oTK.Subject;
    strKeywords = oTK.Keywords;
    
    strProducer = oTK.Producer;
    strCreator = oTK.Creator;
    strCreateDate = oTK.CreateDate;
    strModDate = oTK.ModDate;
    
    // Close the PDF as it's no longer needed
    oTK.CloseInputFile();
    
    // Release Object
    oTK = null;
    
    // Process Complete
    System.Diagnostics.Debug.WriteLine("Done!");
  }
}