/// <summary>
        /// Возвращает словарь параметров.
        /// </summary>
        public Dictionary <string, string> GetParameters()
        {
            var parameters = new Dictionary <string, string>()
            {
                { "posts", Posts }
            };

            if (Extended != 0)
            {
                parameters["extended"] = Extended.ToString();
            }
            if (CopyHistoryDepth != 2)
            {
                parameters["copy_history_depth"] = CopyHistoryDepth.ToString();
            }

            return(parameters);
        }