BackgroundDownloader不适用于Windows 10移动UWP？

Question

我正在创建一个Windows 10 UWP应用程序,其中涉及BackgroundDownloader,这只适用于桌面而不是手机.

码:

    var dl = new BackgroundDownloader();
    dl.CostPolicy = BackgroundTransferCostPolicy.Always;
    file = await localSoundsFolder.CreateFileAsync(name, CreationCollisionOption.ReplaceExisting);
    if (file != null)
    {
        var d = dl.CreateDownload(new Uri(uriToDownloadFrom,UriKind.RelativeOrAbsolute), file);
        d.Priority = BackgroundTransferPriority.High;

        var progressCallback = new Progress<DownloadOperation>(x => DownloadProgress(x, sc)); 
        try
        {
            await d.StartAsync().AsTask(cancellationToken.Token,progressCallback);
            //After this line it doesn't progress!
            CancellationTokenSource token = Utility.cancellationList[sc];
            if (token != null)
            {
                token.Cancel();
                Utility.cancellationList.Remove(sc);
                Debug.WriteLine("The sc has been removed from the download list");
            }
        }
        catch
        {
            return;
        }
    }


private static void DownloadProgress(DownloadOperation download,SoundClass sc)
{
    Debug.WriteLine("Callback");
    var value = download.Progress.BytesReceived * 100 / download.Progress.TotalBytesToReceive;
    Debug.WriteLine("The bytesReceived is {0} and total bytes is {1}", download.Progress.BytesReceived.ToString(), download.Progress.TotalBytesToReceive.ToString());
    new System.Threading.ManualResetEvent(false).WaitOne(10);
    sc.downloadProgress = value;
    if (download.Progress.Status == BackgroundTransferStatus.Completed || value >= 100)
    {
        Debug.WriteLine("DONE donwloading the file {0}", download.ResultFile.Name);
        Debug.WriteLine("The file name happened to be to be added was " + download.ResultFile.Name);
        string fileName = download.ResultFile.Name;
    }
}

在该行之后await d.StartAsync().AsTask(cancellationToken.Token,progressCallback);,程序不继续.而且也没有错误.这不仅适用于手机在桌面上完美运行!我错过了什么？

Answer 1

BackgroundDownloader 和我认为 Windows UWP 中的所有后台任务都很难与它们一起工作。您必须首先在当前解决方案中创建一个新解决方案作为 Windows 运行时组件。之后，您必须通过 Package.AppxManifest 链接它。呃，别忘了把运行时组件作为你主项目的参考。如果你做了这些事情，希望它一定是有效的。但请确保您有一个 RuntimeComponent 并将其链接到您的项目