public void UpdateUI()
 {
     lbTriggersAvailable.Items.Clear();
     foreach (string group in SchedulerManager.GetScheduler().TriggerGroupNames)
     {
         foreach (string trigger in SchedulerManager.GetScheduler().GetTriggerNames(group))
         {
             TriggerAndGroup triggerAndGroup = new TriggerAndGroup(group, trigger);
             lbTriggersAvailable.Items.Add(triggerAndGroup);
         }
     }
 }
 /// <summary>
 /// 从已有的触发器选择
 /// </summary>
 /// <returns></returns>
 private Trigger GetTriggerAvailable()
 {
     if (lbTriggersAvailable.SelectedIndex > -1)
     {
         TriggerAndGroup triggerAndGroup = lbTriggersAvailable.SelectedItem as TriggerAndGroup;
         return(SchedulerManager.GetScheduler().GetTrigger(triggerAndGroup.TriggerName, triggerAndGroup.GroupName));
     }
     else
     {
         MessageBox.Show("请选择现有的触发器,如果没有请添加");
         return(null);
     }
 }