/// <summary>
/// Discovers Current and Completed Downloads.
/// </summary>
public async Task DiscoverDownloadsAsync()
{
CurrentDownloads.Clear();
CompletedDownloads.Clear();
var currentDownloads = await _downloader.DiscoverBackgroundDownloadsAsync();
foreach (var download in currentDownloads)
{
var status = download.Progress.Status;
if (status == BackgroundTransferStatus.Canceled)
{
continue;
}
var appDownloadItem = GetAppDownloadItem(download);
appDownloadItem.Tag = download;
if (status == BackgroundTransferStatus.Completed)
{
CompletedDownloads.Add(appDownloadItem);
}
else
{
CurrentDownloads.Add(appDownloadItem);
}
}
}
private void LoadCompletedDownloadsFromDownloadsHistory()
{
_downloadsHistory.ForEach(appDownloadItem =>
{
if (appDownloadItem.GetStatus() == BackgroundTransferStatus.Completed && appDownloadItem.TotalBytesToReceive > 0)
{
CompletedDownloads.Add(appDownloadItem);
}
});
}
private void downloader_DownloadProgress(DownloadOperation downloadOperation)
{
var appDownloadItem = CurrentDownloads.SingleOrDefault(item =>
(item.Tag as DownloadOperation).Guid == downloadOperation.Guid);
if (appDownloadItem == null)
{
return;
}
appDownloadItem.BytesReceived = downloadOperation.Progress.BytesReceived;
appDownloadItem.SetStatus(downloadOperation.Progress.Status);
// When this event handler is occured for first time (for a specefic DownloadOperation),
// appDownloadItem.TotalBytesToReceive is zero
if (appDownloadItem.TotalBytesToReceive == 0)
{
appDownloadItem.TotalBytesToReceive = downloadOperation.Progress.TotalBytesToReceive;
}
// OS might not report a download completion event, we should check this.
if ((downloadOperation.Progress.BytesReceived == downloadOperation.Progress.TotalBytesToReceive) &&
(downloadOperation.Progress.BytesReceived > 0))
{
appDownloadItem.SetStatus(BackgroundTransferStatus.Completed);
}
if (appDownloadItem.GetStatus() == BackgroundTransferStatus.Completed)
{
appDownloadItem.EndDate = DateTime.Now;
CurrentDownloads.Remove(appDownloadItem);
CompletedDownloads.Add(appDownloadItem);
var task = SaveDownloadsHistoryToFileAsync();
if (this.DownloadCompleted != null)
{
DownloadCompleted(appDownloadItem);
}
}
if (this.DownloadProgress != null)
{
DownloadProgress(appDownloadItem);
}
}
