LINQ] GroupBy

중복 데이타 찾기!!!

데이타 생성.

string[] arr = "a,b,c,d,e,e,e,f,g".Split(',').ToList<string>().ToArray();
 
 
1번
            var ar = arr.GroupBy(g => g).Where(w => w.Count() > 1).Select(s => s.Key);
            string rar = string.Join(",", ar.ToArray());
 
2번
            var aar = from t in arr
                      group t by t into g
                      where g.Count() > 1
                      select g.Key;
            string raar = string.Join(",", aar.ToArray());

위 둘다 동일한 방법임... 한줄이냐 여러줄이냐 차이... ?