/// <summary>
/// Get sequence from the item key value to end or start of the collection in the key order
/// </summary>
/// <param name="fromRangeKey">
/// Item key from which to start; inclusive if <paramref name="backwards"/> is <see langword="false"/>
/// and exclusive otherwise
/// </param>
/// <param name="backwards">
/// Direction of the sequence: ascending if <see langword="false"/> and descending otherwise
/// </param>
/// <returns>
/// <see cref="IDirectedEnumerable<V>"/>
/// </returns>
/// <remarks>
/// Note that when going forward the item with range covering <paramref name="fromRangeKey"/> but starting before
/// it will not be returned.
/// </remarks>
public IDirectedEnumerable <V> Select(K fromRangeKey, bool backwards)
{
C5.IDirectedEnumerable <C5.KeyValuePair <K, V> > seq;
if (backwards)
{
seq = _dictionary.RangeTo(fromRangeKey).Backwards();
}
else
{
seq = _dictionary.RangeFrom(fromRangeKey);
}
return(new C5DirectedEnumerable <V>(new DictionaryEnumerableValueAdapter <K, V>(seq)));
}