public async Task StarDownload(string fileName, Uri uri)
{
fileName = _utilityHelper.ReplaceInvalidCharactorsInFileName(fileName);
//创建文件
//td:此处添加文件存在检测逻辑
var file = await _storageService.CreaterFile(defaultFolder, fileName);
var downloadinfo = await _downloadService.CreateDownload(uri, file, DownloadProgress);
DownloadingVM.DownloadOperations.Add(downloadinfo);
try
{
await downloadinfo.Start();
//下载完成动作
DownloadingVM.DownloadOperations.Remove(downloadinfo);
FinishedDownload(downloadinfo);
}
catch (TaskCanceledException)
{
}
}