问Windows 8后台任务

EN

class BackroundBuilder
{
  public BackroundBuilder()
  {
    this.RegisterTimeTriggerBackgroundTask();
  }

  //this is the code that registers my backround task to run a trigger
  //was added for testing.
  private bool RegisterTimeTriggerBackgroundTask()
  {
    BackgroundTaskBuilder builder = new BackgroundTaskBuilder();
    builder.Name = "Background task test";
    builder.TaskEntryPoint = "PostPage.xmal";
    // Run every 70 minutes if the device has internet connectivity
    IBackgroundTrigger trigger = new TimeTrigger(70, false);
    builder.SetTrigger(trigger);
    IBackgroundCondition condition = new
        SystemCondition(SystemConditionType.InternetAvailable);

    //this is the trigger it's set to fire when internet becomes available            
    IBackgroundTrigger Itrigger = new
        SystemTrigger(SystemTriggerType.InternetAvailable,true);
    builder.SetTrigger(Itrigger);

    builder.AddCondition(condition);
    IBackgroundTaskRegistration task = builder.Register();

    return true;
  }

  public async void Run(IBackgroundTaskInstance taskInstance)
  {
    BackgroundTaskDeferral _deferral = taskInstance.GetDeferral();            

    //WindowsBlogReader.FeedDataSource updateAll = new WindowsBlogReader.FeedDataSource();
    //direct input for the test string is declared below but the updateAll declaration     
    // above is the one that will be used once the test works
    WindowsBlogReader.LiveTileTimeUpdate updateAll = new WindowsBlogReader.LiveTileTimeUpdae();

    //this is the test to see if the background task will fire
    //await was in front of the below statement but im injecting that String into a method
    //that is not setup for async the method being used once this works is an async 
    updateAll.update("Background task fired");
    //this update method adds a String too the list of Sting that's the live tile cycles though 
    _deferral.Complete();
  }     
}

<Extension Category="windows.backgroundTasks" EntryPoint="Tasks.BackroundBuilder">
  <BackgroundTasks>
    <Task Type="systemEvent" />
    <Task Type="timer" />
  </BackgroundTasks>
</Extension>