/// 
    /// 目录权限    /// 
    public enum FloderRights    {        FullControl,        Read,        Write    }        /// 
        /// 创建Windows帐户        /// 
        ///         /// 
               public static void CreateLocalUser(string username, string password, string description)        {            DirectoryEntry dirEntry = new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer");            var NewUser = dirEntry.Children.Add(username, "user");            NewUser.Invoke("SetPassword", new object[] { password });            NewUser.Invoke("Put", new object[] { "Description", description });            NewUser.CommitChanges();        }        /// 
        /// 更改Windows帐户密码        /// 
        ///         ///         ///         public static void ChangeWinUserPasswd(string username, string oldPwd, string newPwd)        {            DirectoryEntry dirEntry = new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer");            DirectoryEntry userEntry = dirEntry.Children.Find(username, "user");            object[] password = new object[] { newPwd, oldPwd };            object ret = userEntry.Invoke("ChangePassword", password);            userEntry.CommitChanges();        }        /// 
        /// 给目录添加用户和权限        /// 
        ///         ///         ///         public static void AddPathRights(string pathname, string username, FloderRights qx)        {            DirectoryInfo dirinfo = new DirectoryInfo(pathname);            if ((dirinfo.Attributes & FileAttributes.ReadOnly) != 0)            {                dirinfo.Attributes = FileAttributes.Normal;            }            //取得访问控制列表            DirectorySecurity dirsecurity = dirinfo.GetAccessControl();            // string strDomain = Dns.GetHostName();            switch (qx)            {                case FloderRights.FullControl:                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.FullControl, AccessControlType.Allow));                    break;                case FloderRights.Read:                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Read, AccessControlType.Allow));                    break;                case FloderRights.Write:                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Write, AccessControlType.Allow));                    break;                default:                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.FullControl, AccessControlType.Deny));                    break;            }            dirinfo.SetAccessControl(dirsecurity);            //取消目录从父继承            DirectorySecurity dirSecurity = System.IO.Directory.GetAccessControl(pathname);            dirSecurity.SetAccessRuleProtection(true, false);            System.IO.Directory.SetAccessControl(pathname, dirSecurity);            //AccessControlType.Allow允许访问受保护对象//Deny拒绝访问受保护对象            //FullControl、Read 和 Write 完全控制,读,写            //FileSystemRights.Write写入//Delete删除 //DeleteSubdirectoriesAndFiles删除文件夹和文件//ListDirectory读取            //Modify读写删除-修改//只读打开文件和复制//        }        /// 
        /// 判断Windows用户是否存在        /// 
        ///         /// 
               public static bool ExistWinUser(string username)        {            try            {                using (DirectoryEntry dirEntry = new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer"))                {                    //删除存在用户                    var delUser = dirEntry.Children.Find(username, "user");                    return delUser != null;                }            }            catch            {                return false;            }        }        /// 
        /// 删除Windows用户        /// 
        ///         /// 
               public static bool DeleteWinUser(string username)        {            try            {                using (DirectoryEntry dirEntry = new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer"))                {                    //删除存在用户                    var delUser = dirEntry.Children.Find(username, "user");                    if (delUser != null)                    {                        dirEntry.Children.Remove(delUser);                    }                }                return true;            }            catch            {                return false;            }        }