后台代理错误WP7

当我尝试在windows phone 7.5中添加一个定期任务时，它给了我一个“BNS错误：此类型的ScheduledAction的最大数量已被添加。”错误，但我没有添加任何定期任务。该代码在Windows Phone 8上正常工作，但在WP7.5上引发了这个错误。此外，该应用程序安排提醒和警报。后台代理错误WP7

string periodicTaskName = "myperiodictask"; 
     PeriodicTask periodicTask = ScheduledActionService.Find(periodicTaskName) as PeriodicTask; 
     if (periodicTask != null) 
     { 
      try 
      { 
       ScheduledActionService.Remove(periodicTaskName); 
      } 
      catch (Exception) 
      { } 
     } 
     periodicTask = new PeriodicTask(periodicTaskName); 
     periodicTask.Description = "Updates LiveTile, Sessions and Assignments"; 
     periodicTask.ExpirationTime = DateTime.Now.AddDays(10); 
     try 
     { 
      ScheduledActionService.Add(periodicTask); 
     } 
     catch (InvalidOperationException exception) 
     { 
      if (exception.Message.Contains("BNS Error: The action is disabled")) 
       MessageBox.Show("Background agents have been disabled by the user."); 
      if (exception.Message.Contains("BNS Error: The maximum number of ScheduledActions of this type have already been added.")) 
       MessageBox.Show("maximum number of ScheduledActions of this type have already been added!"); 
     } 
     catch (SchedulerServiceException) 
     { }

来源

2013-04-29 Timay