本文实例讲述了C#获取指定PDF文件页数的方法。分享给大家供大家参考。具体如下：

using System;using System.IO;using System.Text.RegularExpressions;using System.Windows.Forms;namespace RobvanderWoude{ class PDFPageCount { static int Main( string[] args ) { #region Get help if ( args.Length == 0 ) { ShowHelp( ); return 0; } foreach ( string arg in args ) { if ( arg == "/?" || arg == "-?" || arg.ToLower( ) == "--help" ) { ShowHelp( ); return 0; } } #endregion int errors = 0; foreach ( string arg in args ) { try { Regex regexp = new Regex( @"^(.*)\\([^\\]+\.pdf)$", RegexOptions.IgnoreCase ); if ( regexp.IsMatch( arg ) ) { // Match means the filespec has a valid format (i.e. *.pdf) string[] matches = regexp.Split( arg ); string folder = matches[1]; string filespec = matches[2]; if ( Directory.Exists( folder ) ) { // Folder exists, check for matching files string[] fileList = Directory.GetFiles( folder, filespec ); if ( fileList.Length == 0 ) { // No matching files in this folder ShowError( "ERROR: No files matching \"{0}\" were found in \"{1}\"", filespec, folder ); errors += 1; } else { // Iterate through list of matching files foreach ( string file in fileList ) { int pagecount = PageCount( file ); if ( pagecount == -1 ) { // Just increase the error count, the PageCount( ) // procedure already wrote an error message to screen errors += 1; } else { // No pages means there is a problem with the file if ( pagecount == 0 ) { Console.ForegroundColor = ConsoleColor.Red; errors += 1; } // Display the formated result on screen Console.WriteLine( "{0,4} {1,-10} {2}", pagecount.ToString( ), ( pagecount == 1 ? "page" : "pages" ), file ); if ( pagecount == 0 ) { Console.ForegroundColor = ConsoleColor.Gray; } } } } } else { // Folder doesn't exist ShowError( "ERROR: Folder \"{0}\" not found", folder ); errors += 1; } } else { // No match for the regular expression means the filespec was invalid ShowError( "ERROR: Invalid filespec \"{0}\", please specify PDF files only", arg ); errors += 1; } } catch ( Exception e ) { // All other errors: display an error message and then continue ShowError( "ERROR: {0}", e.Message ); errors += 1; } } if ( errors != 0 ) { ShowError( " {0} finished with {1} error{2}", GetExeName( ), errors.ToString( ), ( errors == 1 ? "" : "s" ) ); } return errors; } static string GetExeName( ) { string exe = Application.ExecutablePath.ToString( ); Regex regexp = new Regex( @"\\([^\\]+)$" ); return regexp.Split( exe )[1]; } static int PageCount( string filename ) { Regex regexp = new Regex( @"\.pdf$", RegexOptions.IgnoreCase ); if ( regexp.IsMatch( filename ) ) { try { FileStream fs = new FileStream( filename, FileMode.Open, FileAccess.Read ); StreamReader sr = new StreamReader( fs ); string pdfText = sr.ReadToEnd( ); regexp = new Regex( @"/Type\s*/Page[^s]" ); MatchCollection matches = regexp.Matches( pdfText ); return matches.Count; } catch ( Exception e ) { ShowError( "ERROR: {0} ({1})", e.Message, filename ); return -1; } } else { ShowError( "ERROR: {0} is not a PDF file", filename ); return -1; } } static void ShowError( string message, string param1, string param2 = "", string param3 = "" ) { Console.Error.WriteLine( ); Console.ForegroundColor = ConsoleColor.Red; Console.Error.WriteLine( message, param1, param2, param3 ); Console.ForegroundColor = ConsoleColor.Gray; Console.Error.WriteLine( ); } #region Display help text static void ShowHelp( ) { Console.Error.WriteLine( ); Console.Error.WriteLine( "{0}, Version 1.02", GetExeName( ) ); Console.Error.WriteLine( "Return the page count for the specified PDF file(s)" ); Console.Error.WriteLine( ); Console.Error.WriteLine( "Usage: {0} filespec [ filespec [ filespec [ ... ] ] ]", GetExeName( ).ToUpper( ) ); Console.Error.WriteLine( ); Console.Error.WriteLine( "Where: \"filespec\" is a file specification for the PDF file(s) to" ); Console.Error.WriteLine( " be listed (wildcards * and ? are allowed)" ); Console.Error.WriteLine( ); Console.Error.WriteLine( "Note: The program's return code equals the number of errors encountered." ); Console.Error.WriteLine( ); Console.Error.WriteLine( "Written by Rob van der Woude" ); } #endregion }}

希望本文所述对大家的C#程序设计有所帮助。