如何给文件夹和文件添加“everyone”权限，并且将其设置为“完全控制”

Question

如何给文件夹和文件添加“everyone”权限，并且将其设置为“完全控制”,我是这么写的，但是不知道为什么有的时候不好用，有的时候就好用，是不是跟机器有问题，请教各位，一下是我写的代码，各位有没有别的办法
 public void AddEvy()
        {
            Hashtable ht = new Hashtable();
            ht.Add("Web.config", "F");
            ht.Add("map", "D");
            ht.Add("pic", "D");
            ht.Add("rth/App_Data/SysConfig.xml", "F");
            ht.Add("rth/config/Menus.xml", "F");
            ht.Add("rth/zwwh/Web.config", "F");
            ht.Add("log", "D");            foreach (DictionaryEntry de in ht)
            {
                string s =  System.Windows.Forms.Application.StartupPath+"\\"+de.Key.ToString();
                if (de.Value.ToString() == "F")
                {
                    if (!File.Exists(s))
                    {
                        File.Create(s);
                    }
                }
                else
                {
                    if (!Directory.Exists(s))
                    {
                        Directory.CreateDirectory(s);
                    }
                }                if (de.Value.ToString() == "F")
                {
                    AddDirectorySecurity("F", s, "Everyone", FileSystemRights.FullControl, AccessControlType.Allow);
                }
                else if (de.Value.ToString() == "D")
                {
                    AddDirectorySecurity("D", s, "Everyone", FileSystemRights.FullControl, AccessControlType.Allow);
                }
            }
        }
        /// <summary>
        /// 设置文件访问权限
        /// </summary>
        /// <param name="FileName"></param>
        /// <param name="Account"></param>
        /// <param name="Rights"></param>
        /// <param name="ControlType"></param>
        protected void AddDirectorySecurity(string t, string FileName, string Account, FileSystemRights Rights, AccessControlType ControlType)
        {
            if (t == "F")
            {
                FileInfo fi = new FileInfo(FileName);
                FileSecurity dSecurity = fi.GetAccessControl();
                dSecurity.AddAccessRule(new FileSystemAccessRule(Account, Rights, ControlType));
                fi.SetAccessControl(dSecurity);
            }
            else
            {
                DirectoryInfo dInfo = new DirectoryInfo(FileName);
                DirectorySecurity dSecurity = dInfo.GetAccessControl();
                dSecurity.AddAccessRule(new FileSystemAccessRule(Account, Rights, ControlType));
                dInfo.SetAccessControl(dSecurity);
            }
        }