private void RealTraderOnSecuritiesChanged(IEnumerable <Security> securities)
{
SecuritiesChanged?.Invoke(this, new SecuritiesEventArgs(securities));
}
/// <summary>
/// Вызвать событие <see cref="SecuritiesChanged"/>.
/// </summary>
/// <param name="securities">Инструменты, которые нужно передать в событие.</param>
private void RaiseSecuritiesChanged(IEnumerable <Security> securities)
{
SecuritiesChanged.SafeInvoke(securities);
}