C＃列表问题

List<IEnumerable<T>> listOfEnumerables = Get...();

List<T> listOfObjects = new List<T>();

// I want 'listOfObjects' to contain every element from every enumerable
// in 'listOfEnumerables'.

foreach (var enumerable in listOfEnumerables)
{
    listOfObjects.AddRange(enumerable);
}

List<T> listOfObjects = listOfEnumerables.SelectMany(s => s).ToList();

listOfEnumerables.ForEach(i => listOfObjects.AddRange(i));