Проблемы в клиринг

protected void ProcessSecurityAction(string nativeSecurityId, Action<Security> action, bool ignoreIfNotExist)
		{
			if (nativeSecurityId.IsEmpty())
				throw new ArgumentNullException("nativeSecurityId");

			if (action == null)
				throw new ArgumentNullException("action");

			var security = _nativeIdSecurities.TryGetValue(nativeSecurityId);

			if (security == null)
			{
				if (!ignoreIfNotExist)
					_suspendedSecurityEvents.Add(nativeSecurityId, action);
			}
			else
				action(security);
		}