/// <summary>
 /// 从指定的文件或目录移除访问权限。
 /// </summary>
 /// <param name="path">文件或目录路径。</param>
 /// <param name="identity">Windows 用户或组名称。</param>
 public static void RemovePermission(string path, string identity)
 {
     if (System.IO.Directory.Exists(path))
     {
         System.Security.AccessControl.DirectorySecurity ds = System.IO.Directory.GetAccessControl(path);
         ds.PurgeAccessRules(new System.Security.Principal.NTAccount(identity));
         System.IO.Directory.SetAccessControl(path, ds);
     }
     else if (System.IO.File.Exists(path))
     {
         System.Security.AccessControl.FileSecurity ds = System.IO.File.GetAccessControl(path);
         ds.PurgeAccessRules(new System.Security.Principal.NTAccount(identity));
         System.IO.File.SetAccessControl(path, ds);
     }
 }