C#读取“我的文档”等特殊系统路径及环境变量

using Microsoft.Win32;
namespace JPGCompact
{
    public partial class MainForm : Form
    {
        private void Test()
        {
            RegistryKey folders;
            folders = OpenRegistryPath(Registry.CurrentUser, @"\software\microsoft\windows\currentversion\explorer\shell folders");
            // Windows用户桌面路径
            string desktopPath = folders.GetValue("Desktop").ToString();
            // Windows用户字体目录路径
            string fontsPath = folders.GetValue("Fonts").ToString();
            // Windows用户网络邻居路径
            string nethoodPath = folders.GetValue("Nethood").ToString();
            // Windows用户我的文档路径
            string personalPath = folders.GetValue("Personal").ToString();
            // Windows用户开始菜单程序路径
            string programsPath = folders.GetValue("Programs").ToString();
            // Windows用户存放用户最近访问文档快捷方式的目录路径
            string recentPath = folders.GetValue("Recent").ToString();
            // Windows用户发送到目录路径
            string sendtoPath = folders.GetValue("Sendto").ToString();
            // Windows用户开始菜单目录路径
            string startmenuPath = folders.GetValue("Startmenu").ToString();
            // Windows用户开始菜单启动项目录路径
            string startupPath = folders.GetValue("Startup").ToString();
            // Windows用户收藏夹目录路径
            string favoritesPath = folders.GetValue("Favorites").ToString();
            // Windows用户网页历史目录路径
            string historyPath = folders.GetValue("History").ToString();
            // Windows用户Cookies目录路径
            string cookiesPath = folders.GetValue("Cookies").ToString();
            // Windows用户Cache目录路径
            string cachePath = folders.GetValue("Cache").ToString();
            // Windows用户应用程式数据目录路径
            string appdataPath = folders.GetValue("Appdata").ToString();
            // Windows用户打印目录路径
            string printhoodPath = folders.GetValue("Printhood").ToString();
        }
        private RegistryKey OpenRegistryPath(RegistryKey root, string s)
        {
            s = s.Remove(0, 1) + @"\";
            while (s.IndexOf(@"\") != -1)
            {
                root = root.OpenSubKey(s.Substring(0, s.IndexOf(@"\")));
                s = s.Remove(0, s.IndexOf(@"\") + 1);
            }
            return root;
        }
    }