C#のプロパティでLISTに変換をかけた結果を返す

        public List<string> SOURCES { get; set; }

        public List<string> FORMATTED_SOURCES
        {
            get {
                List<string> temp = SOURCES.Select(v => FormatData(v)).ToList();
                return SOURCES.Select(v => FormatData(v)).ToList();
            }
        }