获取ALL USER 的特殊目录的类

.net 框架中提供的 System.Environment.GetFolderPath 只能获取当前用户的特殊目录，无法获取所有用户的特殊目录。我做了一个类，可以帮助获取所有用户的特殊目录。这个类调用SHGetFolderPath windows API 来获取ALL USER 的特殊目录路径，网上有很多相关的文章用的API是有些过时了，这篇文章中的API可以适用于windows 2000 后的任何操作系统。

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace MySystem
{
    public class Environment
    {
        [DllImport("shell32.dll")]
        static extern int SHGetFolderPath(IntPtr hwndOwner, SpecialFolderCSIDL nFolder, IntPtr hToken,
           uint dwFlags, [Out] StringBuilder pszPath);

        private const int MAX_PATH = 260;

        public enum SpecialFolderCSIDL : int
        {
            CSIDL_DESKTOP = 0x0000,    // <desktop>
            CSIDL_INTERNET = 0x0001,    // Internet Explorer (icon on desktop)
            CSIDL_PROGRAMS = 0x0002,    // Start Menu\Programs
            CSIDL_CONTROLS = 0x0003,    // My Computer\Control Panel
            CSIDL_PRINTERS = 0x0004,    // My Computer\Printers
            CSIDL_PERSONAL = 0x0005,    // My Documents
            CSIDL_FAVORITES = 0x0006,    // <user name>\Favorites
            CSIDL_STARTUP = 0x0007,    // Start Menu\Programs\Startup
            CSIDL_RECENT = 0x0008,    // <user name>\Recent
            CSIDL_SENDTO = 0x0009,    // <user name>\SendTo
            CSIDL_BITBUCKET = 0x000a,    // <desktop>\Recycle Bin
            CSIDL_STARTMENU = 0x000b,    // <user name>\Start Menu
            CSIDL_MYMUSIC = 0x000d, //
            CSIDL_DESKTOPDIRECTORY = 0x0010,    // <user name>\Desktop
            CSIDL_DRIVES = 0x0011,    // My Computer
            CSIDL_NETWORK = 0x0012,    // Network Neighborhood
            CSIDL_NETHOOD = 0x0013,    // <user name>\nethood
            CSIDL_FONTS = 0x0014,    // windows\fonts
            CSIDL_TEMPLATES = 0x0015,
            CSIDL_COMMON_STARTMENU = 0x0016,    // All Users\Start Menu
            CSIDL_COMMON_PROGRAMS = 0x0017,    // All Users\Programs
            CSIDL_COMMON_STARTUP = 0x0018,    // All Users\Startup
            CSIDL_COMMON_DESKTOPDIRECTORY = 0x0019,    // All Users\Desktop
            CSIDL_APPDATA = 0x001a,    // <user name>\Application Data
            CSIDL_PRINTHOOD = 0x001b,    // <user name>\PrintHood
            CSIDL_LOCAL_APPDATA = 0x001c,    // <user name>\Local Settings\Applicaiton Data (non roaming)
            CSIDL_ALTSTARTUP = 0x001d,    // non localized startup
            CSIDL_COMMON_ALTSTARTUP = 0x001e,    // non localized common startup
            CSIDL_COMMON_FAVORITES = 0x001f,
            CSIDL_INTERNET_CACHE = 0x0020,
            CSIDL_COOKIES = 0x0021,
            CSIDL_HISTORY = 0x0022,
            CSIDL_COMMON_APPDATA = 0x0023,    // All Users\Application Data
            CSIDL_WINDOWS = 0x0024,    // GetWindowsDirectory()
            CSIDL_SYSTEM = 0x0025,    // GetSystemDirectory()
            CSIDL_PROGRAM_FILES = 0x0026,    // C:\Program Files
            CSIDL_MYPICTURES = 0x0027,    // C:\Program Files\My Pictures
            CSIDL_PROFILE = 0x0028,    // USERPROFILE
            CSIDL_SYSTEMX86 = 0x0029,    // x86 system directory on RISC
            CSIDL_PROGRAM_FILESX86 = 0x002a,    // x86 C:\Program Files on RISC
            CSIDL_PROGRAM_FILES_COMMON = 0x002b,    // C:\Program Files\Common
            CSIDL_PROGRAM_FILES_COMMONX86 = 0x002c,    // x86 Program Files\Common on RISC
            CSIDL_COMMON_TEMPLATES = 0x002d,    // All Users\Templates
            CSIDL_COMMON_DOCUMENTS = 0x002e,    // All Users\Documents
            CSIDL_COMMON_ADMINTOOLS = 0x002f,    // All Users\Start Menu\Programs\Administrative Tools
            CSIDL_ADMINTOOLS = 0x0030,    // <user name>\Start Menu\Programs\Administrative Tools
            CSIDL_CONNECTIONS = 0x0031,    // Network and Dial-up Connections
        };

        public static string GetAllUsersFolderPath(SpecialFolderCSIDL csidl)
        {
            StringBuilder path = new StringBuilder(MAX_PATH);
            SHGetFolderPath(IntPtr.Zero, csidl, IntPtr.Zero, 0, path);
            return path.ToString();
        }

        public static string GetAllUsersFolderPath(System.Environment.SpecialFolder specialFolder)
        {
            SpecialFolderCSIDL csidl;

            switch (specialFolder)
            {
                case System.Environment.SpecialFolder.ApplicationData:
                    csidl = SpecialFolderCSIDL.CSIDL_APPDATA;
                    break;
                case System.Environment.SpecialFolder.CommonApplicationData:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_APPDATA;
                    break;
                case System.Environment.SpecialFolder.CommonProgramFiles:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_PROGRAMS;
                    break;
                case System.Environment.SpecialFolder.Cookies:
                    csidl = SpecialFolderCSIDL.CSIDL_COOKIES;
                    break;
                case System.Environment.SpecialFolder.Desktop:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_DESKTOPDIRECTORY;
                    break;
                case System.Environment.SpecialFolder.DesktopDirectory:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_DESKTOPDIRECTORY;
                    break;
                case System.Environment.SpecialFolder.Favorites:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_FAVORITES;
                    break;
                case System.Environment.SpecialFolder.History:
                    csidl = SpecialFolderCSIDL.CSIDL_HISTORY;
                    break;
                case System.Environment.SpecialFolder.InternetCache:
                    csidl = SpecialFolderCSIDL.CSIDL_INTERNET_CACHE;
                    break;
                case System.Environment.SpecialFolder.LocalApplicationData:
                    csidl = SpecialFolderCSIDL.CSIDL_LOCAL_APPDATA;
                    break;
                case System.Environment.SpecialFolder.MyComputer:
                    csidl = SpecialFolderCSIDL.CSIDL_DRIVES;
                    break;
                case System.Environment.SpecialFolder.MyDocuments:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_DOCUMENTS;
                    break;
                case System.Environment.SpecialFolder.MyMusic:
                    csidl = SpecialFolderCSIDL.CSIDL_MYMUSIC;
                    break;
                case System.Environment.SpecialFolder.MyPictures:
                    csidl = SpecialFolderCSIDL.CSIDL_MYPICTURES;
                    break;
                case System.Environment.SpecialFolder.ProgramFiles:
                    csidl = SpecialFolderCSIDL.CSIDL_PROGRAM_FILES;
                    break;
                case System.Environment.SpecialFolder.Programs:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_PROGRAMS;
                    break;
                case System.Environment.SpecialFolder.Recent:
                    csidl = SpecialFolderCSIDL.CSIDL_RECENT;
                    break;
                case System.Environment.SpecialFolder.SendTo:
                    csidl = SpecialFolderCSIDL.CSIDL_SENDTO;
                    break;
                case System.Environment.SpecialFolder.StartMenu:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_STARTMENU;
                    break;
                case System.Environment.SpecialFolder.Startup:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_STARTUP;
                    break;
                case System.Environment.SpecialFolder.System:
                    csidl = SpecialFolderCSIDL.CSIDL_SYSTEM;
                    break;
                case System.Environment.SpecialFolder.Templates:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_TEMPLATES;
                    break;
                default:
                    csidl = SpecialFolderCSIDL.CSIDL_COMMON_DOCUMENTS;
                    break;
            }

            return GetAllUsersFolderPath(csidl);
        }
    }
}