private static async Task <IEnumerable <IPlayerStatsSummary> > GetPlayerStatsSummariesAsync( IApiModel leagueModel, long summonerId, SeasonEnum?season = null, RegionEnum?region = null) { if (leagueModel == null) { throw new ArgumentNullException("leagueModel"); } var statsService = new StatsService(leagueModel.ApiConfiguration); return(await statsService.GetPlayerStatsSummariesBySummonerIdAsync(summonerId, season, region)); }