public IEnumerable <WorkflowItemEvent> AllLambdaEvents(LambdaItem lambdaItem)
        {
            var allEvents = new List <WorkflowItemEvent>();

            foreach (var historyEvent in AllEventsInDescOrderOfEventId)
            {
                var lambdaEvent = historyEvent.LambdaEvent(_workflowTask.AllEvents);
                if (lambdaEvent == null)
                {
                    continue;
                }
                if (lambdaEvent.IsFor(lambdaItem) && !lambdaEvent.InChainOf(allEvents))
                {
                    allEvents.Add(lambdaEvent);
                    yield return(lambdaEvent);
                }
            }
        }
 public WorkflowItemEvent LastLambdaEvent(LambdaItem lambdaItem)
 {
     return(AllLambdaEvents(lambdaItem).FirstOrDefault(e => !LastEventFilters.Lambda.Contains(e)));
 }