Audio 自定义通知声音未播放windows universal app 8.1

我想在收到通知时播放自定义声音，但不是播放自定义声音，而是播放默认声音。这里发生了什么错误。甚至音频也在正确的路径上

 public void AddNotification(int t, String date,String idPrefix)
{
    ToastTemplateType toastTemplate = ToastTemplateType.ToastText02;
    XmlDocument toastXml = ToastNotificationManager.GetTemplateContent(toastTemplate);

    DateTime dueTime = DateTime.Now;
    string period = String.Empty;

    switch (t)
    {
        case 0:
            period = "15min";
            dueTime = GetNotificationTime(date, dueTime, 15);
            break;
        case 1:
            period = "30min";
            dueTime = GetNotificationTime(date, dueTime, 30);
            break;
        case 2:
            period = "1hr";
            dueTime = GetNotificationTime(date, dueTime, 60);
            break;
        default: break;
    }

    XmlNodeList toastTextElements = toastXml.GetElementsByTagName("text");
    toastTextElements[0].AppendChild(toastXml.CreateTextNode("show time"));
    toastTextElements[1].AppendChild(toastXml.CreateTextNode("Watch show in " + period));

    //XmlNodeList toastImageAttributes = toastXml.GetElementsByTagName("image");

    //((XmlElement)toastImageAttributes[0]).SetAttribute("src", "ms-appx:///assets/CameraSelected.png");
    //((XmlElement)toastImageAttributes[0]).SetAttribute("alt", "Camera Selected");

    IXmlNode toastNode = toastXml.SelectSingleNode("/toast");
    ((XmlElement)toastNode).SetAttribute("launch", "LandingPage.xaml");

    XmlElement audio = toastXml.CreateElement("audio");
    audio.SetAttribute("src", "ms-appx:///Assets/Guitar.aifc");
     toastNode.AppendChild(audio);
    //launch tost immediatly

    ToastNotification toast = new ToastNotification(toastXml);
    ToastNotificationManager.CreateToastNotifier().Show(toast);

}

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我在这里做错了什么。有谁能指导我实施。

我想出了解决方案

它不支持aifc文件。我已将声音文件转换为wav，现在工作正常