C#将指定目录所有文件名转换成小写的方法

本文实例讲述了c#将指定目录所有文件名转换成小写的方法。分享给大家供大家参考。具体如下：

using system;
using system.io;
using system.linq;
namespace robvanderwoude
{
 class locase
 {
  static int main( string[] args )
  {
   string dir = string.empty;
   string filespec = string.empty;
   char[] trailingbackslash = "\\".tochararray( 0, 1 );
   char[] upcaseletters = "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( upcaseletters ) > -1 )
      {
       count++;
       string newfilename = dir + filename.tolowerinvariant( );
       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 )
  {
   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( "locase.exe, version 1.02" );
   console.error.writeline( "rename specified files to all lower case" );
   console.error.writeline( );
   console.error.write( "usage: " );
   console.foregroundcolor = consolecolor.white;
   console.error.writeline( "locase.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" );
   return 0;
  }
 }
}

希望本文所述对大家的c#程序设计有所帮助。