Lookup<K, E> sealed class Lookup<K, E> : ILookup<K, E>, IEnumerable<IGrouping<K, E>>, IEnumerable Documentation Code public int Count { get; } public IEnumerable<E> this[K key] { get; } public Lookup(IEqualityComparer<K> comparer) public void Add(K key, E element) public bool Contains(K key) public IEnumerator<IGrouping<K, E>> GetEnumerator()