c# - 尝试从 Windows Phone 8.1 : "The application identifier provided is invalid" 中的 backgroundaudiotask 更新 livetile

Question

我有一个音乐播放器，想用播放轨道的专辑封面更新 livetile。因此，每次轨道发生变化时，我都会在单独的 Windows Runtine 组件中调用一个方法。该方法如下所示:

public async void CreateLivetile(string albumart, string artist, string trackname)
{
    try
    {
        // constants
        string textElementName = "text";
        string imageElementName = "image";

        // Create a tile update manager
        var updater = TileUpdateManager.CreateTileUpdaterForApplication();
        updater.EnableNotificationQueue(true);
        updater.Clear();

        // wide 310x150
        var tileXml = TileUpdateManager.GetTemplateContent(TileTemplateType.TileWide310x150PeekImage03);
        tileXml.GetElementsByTagName(textElementName).LastOrDefault().InnerText = string.Format(artist + " - " + trackname);
        var image = tileXml.GetElementsByTagName(imageElementName).FirstOrDefault();
        if (image != null)
        {
            var src = tileXml.CreateAttribute("src");
            src.Value = albumart;
            image.Attributes.SetNamedItem(src);
        }

        // square 150x150
        var squaredTileXml = TileUpdateManager.GetTemplateContent(TileTemplateType.TileSquare150x150PeekImageAndText01);
        squaredTileXml.GetElementsByTagName(textElementName).FirstOrDefault().InnerText = string.Format(artist + " - " + trackname);
        image = squaredTileXml.GetElementsByTagName(imageElementName).LastOrDefault();
        if (image != null)
        {
            var src = squaredTileXml.CreateAttribute("src");
            src.Value = albumart;
            image.Attributes.SetNamedItem(src);
        }

        updater.Update(new TileNotification(tileXml));
        updater.Update(new TileNotification(squaredTileXml));
    }
    catch (Exception ex)
    {
        Debug.WriteLine(ex.Message);

        // Inform the system that the task is finished.
        //_deferral.Complete();
    }
}

当方法到达这一行时:

var updater = TileUpdateManager.CreateTileUpdaterForApplication();

我收到这个错误:

The application identifier provided is invalid.

此方法在应用程序(前端)中运行良好...

Answer 1

有解决办法: http://social.msdn.microsoft.com/Forums/windowsapps/en-US/83498107-fe0d-4a8b-93f3-02d484983953/tileupdatemanager-throws-exception?forum=wpdevelop

直接提供ID即可: TileUpdateManager.CreateTileUpdaterForApplication("App")