LinqのSelectとSelectManyの違いについて。 public static IEnumerable<TResult> Select<TSource, TResult>( this IEnumerable<TSource> source, Func<TSource, TResult> selector) // ------- public static IEnumerable<TResult> SelectMany<TSource, TResult>( this IEnumerable<TSource> source, Func</tsource></tsource,></tresult></tsource,></tsource></tsource,></tresult>