/// <summary>
        /// It is called by Process engine for adding theadtask related to task element.
        /// </summary>
        /// <param name="item"></param>
        public (ResultOperation result, List <sysBpmsThreadTask> listTask) AddThreadTask(sysBpmsTask item, bool isFirstTask)
        {
            ThreadTaskService        threadTaskService = new ThreadTaskService(base.UnitOfWork);
            ResultOperation          result            = new ResultOperation();
            List <sysBpmsThreadTask> listTask          = new List <sysBpmsThreadTask>();

            switch ((sysBpmsTask.e_TypeLU)item.TypeLU)
            {
            case sysBpmsTask.e_TypeLU.UserTask:
                if (item.MarkerTypeLU.HasValue)
                {
                    foreach (sysBpmsThreadTask threadTaskItem in threadTaskService.GetMultiInstanceTask(item, base.EngineSharedModel))
                    {
                        //if user has access to this method, set thread task access Info to userID
                        if (isFirstTask && this.CheckAccessByThreadTask(item, threadTaskItem, base.EngineSharedModel.CurrentThread.UserID, null))
                        {
                            threadTaskItem.UpdateAccessInfo(base.EngineSharedModel.CurrentThread.UserID, null);
                        }
                        threadTaskService.Add(threadTaskItem);
                        listTask.Add(threadTaskItem);
                    }
                }
                else
                {
                    sysBpmsThreadTask threadTask = new sysBpmsThreadTask();
                    threadTask.Update(base.EngineSharedModel.CurrentThreadID.Value, item.ID, DateTime.Now, null, string.Empty, 0, (int)sysBpmsThreadTask.e_StatusLU.New);
                    threadTaskService.SetAccessInfoTo(threadTask, item, base.EngineSharedModel);
                    //if user has access to this method, set thread task access Info to thread userID
                    if (isFirstTask && this.CheckAccessByThreadTask(item, threadTask, base.EngineSharedModel.CurrentThread.UserID, null))
                    {
                        threadTask.UpdateAccessInfo(base.EngineSharedModel.CurrentThread.UserID, null);
                    }

                    threadTaskService.Add(threadTask);
                    listTask.Add(threadTask);
                }
                break;
            }
            return(result, listTask);
        }