小编use*_*696的帖子

我有一些文件需要在app启动时下载(首次运行).我在Windows 8中使用Background Downloader.这就是我使用它的方式:

BackgroundDownloader downloader = new BackgroundDownloader();

List<DownloadOperation> operations = new List<DownloadOperation>();
foreach (FileInfo info in infoFiles)
{
    Windows.Storage.ApplicationData.Current.LocalFolder;
    foreach (string folder in info.Folders)
    {
        currentFolder = await currentFolder.CreateFolderAsync(folder, CreationCollisionOption.OpenIfExists);       
    }
    //folder hierarchy created, save the file
    StorageFile file = await currentFolder.CreateFileAsync(info.FileName, CreationCollisionOption.ReplaceExisting);

    DownloadOperation op = downloader.CreateDownload(new Uri(info.Url), file);
    activeDownloads.Add(op);
    operations.Add(op);
}


foreach (DownloadOperation download in operations)
{
  //start downloads
  await HandleDownloadAsync(download, true);
}

当我尝试使用时,BackgroundDownloader.GetCurrentDownloadsAsync();我只发现了一个后台下载.所以我删除了上面的await运算符,让它们异步启动.

但是我需要知道所有文件何时完成,所以我可以设置进度条.

我需要一种方法来下载多个文件,发现所有文件BackgroundDownloader.GetCurrentDownloadsAsync();并知道所有下载完成的时间.

  private async Task HandleDownloadAsync(DownloadOperation download, bool start)
    { …