/// <summary>
/// Returns an enumerator that iterates through the <see cref="ParticleParameterCollection"/>.
/// </summary>
/// <returns>
/// An <see cref="List{T}.Enumerator"/> for <see cref="ParticleParameterCollection"/>.
/// </returns>
public List <IParticleParameter> .Enumerator GetEnumerator()
{
return(_collection.GetEnumerator());
}