public List <T> GetItems(IQuery query)
        {
            var camlHelper = new CamlHelper <T>("" + query);
            var result     = new List <T>();

            foreach (var item in _list)
            {
                if (camlHelper.CheckWhere(item))
                {
                    result.Add(_convertationHelper.ConvertToObject(item));
                }
            }
            return(result);
        }