//创建后台下载任务
public async void CreateBackDownload(string fileName, Uri uri)
{
var folder = await GetDownloadFolder();
fileName = _utilityHelper.ReplaceInvalidCharactorsInFileName(fileName);
var file = await _storageService.CreaterFile(folder, fileName);
var operation = _downloader.CreateDownload(uri, file);
try
{
await operation.StartAsync();
}
catch
{
}
var thumb = await _storageService.GetThumbBytes(file);
DownloadedInfo info = new DownloadedInfo()
{
DownloadedTime = DateTime.Now,
FileName = fileName,
FilePath = file.Path,
Size = operation.Progress.TotalBytesToReceive,
Thumb = thumb
};
StoreDownloadedInfo(info);
_notificationService.ShowDownloadFinishedToast(info.FileName);
}
//将正在下载信息转换为下载完成信息
public async Task <DownloadedInfo> FinishedDownload(DownloadInfo downloadInfo)
{
DownloadedInfo downloadedInfo = new DownloadedInfo();
downloadedInfo.DownloadedTime = DateTime.Now;
downloadedInfo.FileName = downloadInfo.FileName;
downloadedInfo.FilePath = downloadInfo.DownloadOperation.ResultFile.Path;
downloadedInfo.Size = downloadInfo.TotalToReceive;
var file = downloadInfo.DownloadOperation.ResultFile;
downloadedInfo.Thumb = await _storageService.GetThumbBytes(file);
return(downloadedInfo);
}
//存储下载完成的信息
public async void StoreDownloadedInfo(DownloadedInfo downloadedInfo)
{
_dbService.DownloadDbContext.DownloadedInfos.Add(downloadedInfo);
await _dbService.DownloadDbContext.SaveChangesAsync();
}
