C#返回当前系统所有可用驱动器符号的方法

// The initial C# code for the "plain" WMI query was generated by
// WMI Code Generator, Version 5.00, //http://www.robvanderwoude.com/wmigen.php
using System;
using System.Management;
using System.Collections.Generic;
namespace RobvanderWoude
{
 public class ListDrives
 {
 public static int Main( string[] args )
 {
 try
 {
 string computer = string.Empty;
 #region Command line parsing
 // Only 1 optional argument allowed: a remote computer name
 if ( args.Length > 1 )
 {
 throw new Exception( "Invalid command line arguments" );
 }
 if ( args.Length == 1 )
 {
 // We'll display a 'friendly' message if help was requested
 if ( args[0].StartsWith( "/" ) || args[0].StartsWith( "-" ) )
 {
 switch ( args[0].ToUpper( ) )
 {
 case "/?":
 case "-?":
 case "/H":
 case "-H":
 case "--H":
 case "/HELP":
 case "-HELP":
 case "--HELP":
 return WriteError( string.Empty );
 default:
 return WriteError( "Invalid command line argument" );
 }
 }
 else
 {
 computer = "\\" + args[0] + "\";
 }
 }
 #endregion
 string wmins = computer + "root\CIMV2";
 ManagementObjectSearcher searcher = new ManagementObjectSearcher( wmins, "SELECT * FROM Win32_LogicalDisk" );
 List drives = new List( );
 foreach ( ManagementObject queryObj in searcher.Get( ) )
 {
 drives.Add( queryObj["DeviceID"].ToString( ) );
 }
 drives.Sort( );
 string drivelist = "";
 foreach ( string drive in drives )
 {
 drivelist += ( drive + " " );
 }
 Console.WriteLine( drivelist.Trim( ) );
 return 0;
 }
 catch ( Exception e )
 {
 return WriteError( e );
 }
 }
 public static int WriteError( Exception e )
 {
 return WriteError( e == null ? null : e.Message );
 }
 public static int WriteError( string errorMessage )
 { 
 string fullpath = Environment.GetCommandLineArgs( ).GetValue( 0 ).ToString( );
 string[] program = fullpath.Split( '\' );
 string exename = program[program.GetUpperBound( 0 )];
 exename = exename.Substring( 0, exename.IndexOf( '.' ) );
 if ( string.IsNullOrEmpty( errorMessage ) == false )
 {
 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( exename + ", Version 1.10" );
 Console.Error.WriteLine( "List all drive letters in use on the specified computer" );
 Console.Error.WriteLine( );
 Console.Error.Write( "Usage: " );
 Console.ForegroundColor = ConsoleColor.White;
 Console.Error.Write( exename.ToUpper( ) );
 Console.Error.WriteLine( " [ computername ]" );
 Console.ResetColor( );
 Console.Error.WriteLine( );
 Console.Error.WriteLine( "Where: 'computername' is the (optional) name of a remote computer" );
 Console.Error.WriteLine( " (default if not specified: local computer)" );
 Console.Error.WriteLine( );
 Console.Error.WriteLine( "Written by Rob van der Woude" );
 return 1;
 }
 }
}