C#将制定目录文件名转换成大写的方法

using System;using System.IO;using System.Linq;namespace RobvanderWoude{ class UpCase {  static int Main( string[] args )  {   string dir = string.Empty;   string filespec = string.Empty;   char[] trailingbackslash = "//".ToCharArray( 0, 1 );   char[] locaseletters = "abcdefghijklmnopqrstuvwxyz".ToCharArray( 0, 26 );   bool verbose = false;   #region Command Line Parsing   switch ( args.Length )   {    case 0:     return WriteError( string.Empty );    case 1:     filespec = args[0].Trim( '"' );     break;    case 2:     filespec = args[0].Trim( '"' );     if ( args[1].Substring( 0, 2 ).ToUpper( ) == "/V" )     {      verbose = true;     }     else     {      return WriteError( "Invalid command line switch: " + args[1] );     }     break;    default:     return WriteError( string.Empty );   }   if ( string.IsNullOrWhiteSpace( filespec ) || filespec == "/?" )   {    return WriteError( string.Empty );   }   if ( filespec.IndexOfAny( "/?".ToCharArray( 0, 2 ) ) != -1 )   {    return WriteError( "Invalid file specification: /"" + filespec + "/"" );   }   #endregion Command Line Parsing   try   {    // Check if the directory exists    try    {     dir = Path.GetDirectoryName( filespec );     if ( string.IsNullOrWhiteSpace( dir ) )     {      dir = Path.GetFullPath( "." );     }     if ( !Directory.Exists( dir ) )     {      return WriteError( "Directory not found: /"" + dir + "/"" );     }     dir = dir.TrimEnd( trailingbackslash ) + "//";    }    catch ( ArgumentException )    {     return WriteError( "Parent directory not found" );    }    // Extract the FILE specification (removing the path)    string filenames = filespec.Substring( filespec.LastIndexOf( "//" ) + 1 );    // Enumerate the files    string[] files = Directory.EnumerateFiles( dir, filenames ).ToArray<string>( );    int count = 0;    foreach ( string file in files )    {     if ( File.Exists( file ) )     {      string filename = Path.GetFileName( file );      if ( filename.IndexOfAny( locaseletters ) > -1 )      {       count++;       string newfilename = dir + filename.ToUpperInvariant( );       File.Move( file, newfilename );      }     }    }    if ( verbose )    {     Console.WriteLine( "{0} matching file{1} renamed", ( count == 0 ? "No" : count.ToString( ) ), ( count == 1 ? string.Empty : "s" ) );    }    return count;   }   catch ( Exception e )   {    return WriteError( e.Message );   }  }  public static int WriteError( Exception e )  {   return WriteError( e == null ? null : e.Message );  }  public static int WriteError( string errorMessage )  {   /*   UpCase.exe, Version 1.02   Rename specified files to all upper case   Usage:  UpCase.exe filespec [ /Verbose ]   Where:  filespec  is (are) the file(s) to be renamed (wildcards allowed)        /Verbose  displays the number of files renamed   Notes:  Use doublequotes if filespec contains spaces.        Return code (/"ErrorLevel/") equals the number of renamed files.        Switch may be abbreviated, e.g. /V instead of /Verbose.   Written by Rob van der Woude   */   if ( !string.IsNullOrWhiteSpace( errorMessage ) )   {    Console.Error.WriteLine( );    Console.ForegroundColor = ConsoleColor.Red;    Console.Error.Write( "ERROR: " );    Console.ForegroundColor = ConsoleColor.White;    Console.Error.WriteLine( errorMessage );    Console.ResetColor( );   }   Console.Error.WriteLine( );   Console.Error.WriteLine( "UpCase.exe, Version 1.02" );   Console.Error.WriteLine( "Rename specified files to all upper case" );   Console.Error.WriteLine( );   Console.Error.Write( "Usage:  " );   Console.ForegroundColor = ConsoleColor.White;   Console.Error.WriteLine( "UpCase.exe filespec [ /Verbose ]" );   Console.ResetColor( );   Console.Error.WriteLine( );   Console.Error.Write( "Where:  " );   Console.ForegroundColor = ConsoleColor.White;   Console.Error.Write( "filespec" );   Console.ResetColor( );   Console.Error.WriteLine( "  is (are) the file(s) to be renamed (wildcards allowed)" );   Console.ForegroundColor = ConsoleColor.White;   Console.Error.Write( "     /V" );   Console.ResetColor( );   Console.Error.WriteLine( "erbose  displays the number of files renamed" );   Console.Error.WriteLine( );   Console.Error.WriteLine( "Note:   Use doublequotes if filespec contains spaces." );   Console.Error.WriteLine( "     Return code (/"ErrorLevel/") equals the number of renamed files." );   Console.Error.Write( "     Switch may be abbreviated, e.g. " );   Console.ForegroundColor = ConsoleColor.White;   Console.Error.Write( "/V" );   Console.ResetColor( );   Console.Error.Write( " instead of " );   Console.ForegroundColor = ConsoleColor.White;   Console.Error.Write( "/V" );   Console.ResetColor( );   Console.Error.WriteLine( "erbose." );   Console.Error.WriteLine( );   Console.Error.WriteLine( "Written by Rob van der Woude" );   Console.Error.WriteLine( "http://www.baidu.com" );   return 0;  } }}