无法在Cortana画布上显示数据

Question

我正在开发一个UWP应用程序，我想在画布中显示一些数据。但我面临很多问题，现在我无法找出问题所在。 我制作了一个VCD文件，在其中添加了命令，编辑了OnActivated函数，制作了Windows Runtime Component for Background任务，并在Package.appxmanifest文件中进行了声明，但它无法正常工作。 这是VoiceCommandDefinition.xml文件：

<?xml version="1.0" encoding="utf-8" ?> 
  <VoiceCommands xmlns="http://schemas.microsoft.com/voicecommands/1.2">
       <CommandSet xml:lang="en-us" Name="NormalCommands">
         <CommandPrefix>in app</CommandPrefix>
         <Example>Show data in canvas</Example>

            <Command Name="CanvasView">
            <Example>test cortana</Example>
            <ListenFor RequireAppName="ExplicitlySpecified"> {builtin:Cortinnum}test cortana</ListenFor>
              <Feedback>Okay Boss</Feedback>
            <VoiceCommandService Target="CanvasViewService"/>
             </Command>
                </CommandSet>
           </VoiceCommands>

以下是App.xaml.cs代码中的OnActivated函数：

protected override void OnActivated(IActivatedEventArgs args)
    {

        if (args.Kind ==                    Windows.ApplicationModel.Activation.ActivationKind.VoiceCommand)
        {
            var CommandArgs = args as Windows.ApplicationModel.Activation.VoiceCommandActivatedEventArgs;
            var result = CommandArgs.Result;
            var CommandName = result.RulePath[0];
            var text = result.Text;
        }
        else
            base.OnActivated(args);
    }

这是后台服务组件的代码：

using System;
using Windows.ApplicationModel.AppService;
using Windows.ApplicationModel.Background;
using Windows.ApplicationModel.VoiceCommands;

namespace BackgroundService  
{
   public sealed class service:IBackgroundTask
   {
      VoiceCommandServiceConnection voiceServiceConnection;

      BackgroundTaskDeferral serviceDeferral;

    public async void Run(IBackgroundTaskInstance taskInstance)
    {
        serviceDeferral = taskInstance.GetDeferral();
        taskInstance.Canceled += OnTaskCanceled;

        var triggerDetails = taskInstance.TriggerDetails as AppServiceTriggerDetails;

        if (triggerDetails != null && triggerDetails.Name == "CanvasView")
        {
            try
            {
                voiceServiceConnection =
                    VoiceCommandServiceConnection.FromAppServiceTriggerDetails(
                        triggerDetails);

                voiceServiceConnection.VoiceCommandCompleted += OnVoiceCommandCompleted;

                VoiceCommand voiceCommand = await voiceServiceConnection.GetVoiceCommandAsync();

                // perform the appropriate command.
                switch (voiceCommand.CommandName)
                {
                    case "CanvasView":
                        VoiceCommandUserMessage userMessage = new VoiceCommandUserMessage();
                        userMessage.DisplayMessage = "Test Data";
                        userMessage.SpokenMessage = "Test data view successful";
                        var response = VoiceCommandResponse.CreateResponse(userMessage);
                        await voiceServiceConnection.ReportSuccessAsync(response);
                   break;

                    default:
                        VoiceCommandUserMessage userMessage1 = new VoiceCommandUserMessage();
                        userMessage1.DisplayMessage = "Nothing";
                        userMessage1.SpokenMessage = "NO data to show";
                        var response1 = VoiceCommandResponse.CreateResponse(userMessage1);
                        await voiceServiceConnection.ReportSuccessAsync(response1);
                    break;
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine("Handling Voice Command failed " + ex.ToString());
            }
        }
    }
    private void OnVoiceCommandCompleted(VoiceCommandServiceConnection sender, VoiceCommandCompletedEventArgs args)
    {
        if (this.serviceDeferral != null)
        {    
            this.serviceDeferral.Complete();
        }
    }

    private void OnTaskCanceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason)
    {
        System.Diagnostics.Debug.WriteLine("Task cancelled, clean up");
        if (this.serviceDeferral != null)
        {
            //Complete the service deferral
            this.serviceDeferral.Complete();
        }
    }
}

}

编辑： 以下是Package.appxmanifest中的Extensions标记代码：

<Extensions>
    <uap:Extension Category="windows.appService" EntryPoint="Cortinnum.backgroundService.service">
      <uap:AppService Name="service" />
    </uap:Extension>
  </Extensions>