UWP PushNotificationTrigger不会触发后台任务

我正在尝试开发一个Windows 10 UWP应用程序，该应用程序具有由原始Pushnotification触发器触发的后台任务。作为测试，我还在应用程序上有一个处理程序，以查看原始通知实际上是否正确推送并运行。以下是代码片段：UWP PushNotificationTrigger不会触发后台任务

PushNotificationChannel _channel = null; 

    private async void AppInit() 
    { 
     _channel = await Common.WNSHelper.GetChannelAsync(); 
     if (_channel != null) 
     { 
      _channel.PushNotificationReceived += _channel_PushNotificationReceived; 
     } 
     await InstallPositionBackgroundTask(); 
     } 

    private async void _channel_PushNotificationReceived(PushNotificationChannel sender, PushNotificationReceivedEventArgs args) 
    { 
     if (args.NotificationType == PushNotificationType.Raw) 
     { 
      Common.GeneralHelper.SendToast("At App PositionBackgroundTask"); 
     } 
    } 

    private async Task InstallPositionBackgroundTask() 
    { 
     var taskName = "PositionBackgroundTask"; 

     foreach (var tsk in BackgroundTaskRegistration.AllTasks) 
     { 
      if (tsk.Value.Name == taskName) 
      { 
       tsk.Value.Unregister(true); 
      } 
     } 

     var cost = BackgroundWorkCost.CurrentBackgroundWorkCost; 
     if (cost == BackgroundWorkCostValue.High) 
     { 
      return; 
     } 

     var allowed = await BackgroundExecutionManager.RequestAccessAsync(); 
     if (allowed == BackgroundAccessStatus.AllowedSubjectToSystemPolicy 
      || allowed == BackgroundAccessStatus.AlwaysAllowed) 
     { 
      var builder = new BackgroundTaskBuilder(); 

      builder.Name = nameof(PositionBackgroundTask.PositionBackgroundTask); 
      builder.CancelOnConditionLoss = false; 
      builder.TaskEntryPoint = typeof(PositionBackgroundTask.PositionBackgroundTask).FullName; 
      builder.SetTrigger(new PushNotificationTrigger()); 
      BackgroundTaskRegistration task = builder.Register(); 
      task.Completed += new BackgroundTaskCompletedEventHandler(OnCompleted); 

      Common.GeneralHelper.SendToast("Position Task Installed. " + System.DateTime.Now.ToString()); 
     } 
    } 
    private async void button_Click(object sender, RoutedEventArgs e) 
    { 
     // send it 
     var response = await Common.WNSHelper.PushRawAsync<Common.RawRequest>(_channel.Uri, new RawRequest() { RequestType = RawRequestType.RequestPosition, FromDeviceId = _allDevices[0].D_Id }, null); 
    }

这里的后台任务

namespace PositionBackgroundTask 

{ 
    public sealed class PositionBackgroundTask 
    { 

     BackgroundTaskDeferral _deferral; 
     public async void Run(IBackgroundTaskInstance taskInstance) 
     { 
      Common.GeneralHelper.SendToast("At PositionBackgroundTask"); 

      var cancel = new System.Threading.CancellationTokenSource(); 
      taskInstance.Canceled += (s, e) => 
      { 
       cancel.Cancel(); 
       cancel.Dispose(); 
      }; 

      _deferral = taskInstance.GetDeferral(); 
      try 
      { 
       RawNotification notification = (RawNotification)taskInstance.TriggerDetails; 
       //: 
       //: 
       //: 
      } 
      finally 
      { 
       _deferral.Complete(); 
      } 
     } 
    } 
}

这里的清单

<Extension Category="windows.backgroundTasks" EntryPoint="PositionBackgroundTask.PositionBackgroundTask"> 
    <BackgroundTasks> 
    <Task Type="pushNotification" /> 
    </BackgroundTasks> 
</Extension>

这里发送原始通知

public static async Task<HttpResponseMessage> PushRawAsync<T>(string channelUri, RawRequest request, T rawData) 
{ 
    // Get App authorization 
    string appDataSecret = MYAPPSECRET; 
    Uri requestUri = new Uri(@"https://login.live.com/accesstoken.srf"); 

    var client = new System.Net.Http.HttpClient(); 
    System.Net.Http.HttpResponseMessage response = await client.PostAsync(requestUri, new StringContent(appDataSecret, System.Text.Encoding.UTF8, "application/x-www-form-urlencoded")); 
    string responJsonText = await response.Content.ReadAsStringAsync(); 

    WMNToken token = JsonConvert.DeserializeObject<WMNToken>(responJsonText); 

    string requestStr = JsonConvert.SerializeObject(request) + ";" + JsonConvert.SerializeObject(rawData); 
    var content = new StreamContent(new MemoryStream(Encoding.UTF8.GetBytes(requestStr))); 

    client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue(token.Token_type, token.Access_token); 
    client.DefaultRequestHeaders.Add("X-WNS-Type", "wns/raw"); 

    response = await client.PostAsync(channelUri, content); 
    return response; 
}

的代码应用程序definitel y收到通知，但从不后台任务。我做错了什么？

更多信息：看起来像推送通知被击中框，但得到这个错误在事件日志中

Activation of the app 45737MyName.TestPushNotificationpartofemail_4rhf8erfmecqa!App for the Windows.BackgroundTasks contract failed with error: No such interface supported.

而且事实证明我没有继承IBackgroundTask 应该是这样

public sealed class PositionBackgroundTask : IBackgroundTask

来源

2017-04-07 dreamfly

你能否在没有通知的情况下运行后台任务？也就是说，你可以使用代码/按钮点击手动触发它... – Laith

从我读的内容来看，Visual Studio中无法触发推送通知。实际上我有一个TimeTrigger事件后台任务，我可以在Visual Studio中测试它。有没有办法实际运行推送通知后台任务？ – dreamfly

我只是想确保你已经看到你的后台任务代码被一个备用触发器触发。 – Laith

后台任务需要是IBackgroundTask的子类

public sealed class Position BackgroundTask：IBackgroundTask

来源

2017-04-10 21:28:37 dreamfly

UWP PushNotificationTrigger不会触发后台任务

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