public async Task DownloadAsync(WebClient client, DownloadProgress downloadProgress, CancellationToken cancellationToken)
{
// Ensure throttling and increment concurrent download count
await EnsureThrottlingAsync(cancellationToken);
try
{
client.DownloadFileCompleted += (s, e) => DownloadFileCompleted(downloadProgress, s, e);
client.DownloadProgressChanged += (_, e) => DownloadProgressChanged(downloadProgress, e.BytesReceived, e.TotalBytesToReceive);
downloadProgress.Report(new DownloadInfo
{
IsCompleted = true,
RecievedBytes = 0,
TotalBytes = 100,
Speed = 0,
Result = "正在下载"
});
await client.DownloadFileTaskAsync(new Uri(downloadProgress.Url), downloadProgress.FilePath);
}
//catch (Exception ex)
//{
// Console.WriteLine();
//}
finally
{
// Decrement concurrent download count
Interlocked.Decrement(ref _concurrentDownloadCount);
}
}
private void DownloadProgressChanged(DownloadProgress downloadProgress, long bytesReceived, long totalBytesToReceive)
{
if (downloadProgress.StartedAt == default(DateTime))
{
downloadProgress.StartedAt = DateTime.Now;
}
else
{
var timeSpan = DateTime.Now - downloadProgress.StartedAt;
if (timeSpan.TotalSeconds > 0)
{
downloadProgress.Info.Speed = bytesReceived / timeSpan.TotalMilliseconds;
downloadProgress.Info.TotalBytes = totalBytesToReceive;
downloadProgress.Info.RecievedBytes = bytesReceived;
}
}
downloadProgress.Report(new DownloadInfo
{
IsCompleted = false,
RecievedBytes = downloadProgress.Info.RecievedBytes,
TotalBytes = downloadProgress.Info.TotalBytes,
Speed = downloadProgress.Info.Speed,
});
}
private void DownloadFileCompleted(DownloadProgress downloadProgress, object s, AsyncCompletedEventArgs e)
{
(s as WebClient).DownloadFileCompleted -= (sender, ee) => DownloadFileCompleted(downloadProgress, sender, ee);
(s as WebClient).DownloadProgressChanged -= (_, ee) => DownloadProgressChanged(downloadProgress, ee.BytesReceived, ee.TotalBytesToReceive);
if (e.Cancelled)
{
downloadProgress.Report(new DownloadInfo
{
IsCompleted = true,
RecievedBytes = downloadProgress.Info.RecievedBytes,
TotalBytes = downloadProgress.Info.TotalBytes,
Speed = 0,
Result = "取消"
});
return;
}
if (e.Error != null)
{
downloadProgress.Report(new DownloadInfo
{
IsCompleted = true,
RecievedBytes = downloadProgress.Info.RecievedBytes,
TotalBytes = downloadProgress.Info.TotalBytes,
Speed = 0,
Result = $"错误:{e.Error.Message}"
});
return;
}
if (downloadProgress.Type == 0) /*是音乐就给音乐添加信息*/
{
Task.Run(async() =>
{
if (!File.Exists(downloadProgress.FilePath))
{
return;
}
var coverAndDetail = await _NeteaseCloudMusicService.GetCoverAndDetailAsync(downloadProgress.No);
try
{
TagLib.File file = TagLib.File.Create(downloadProgress.FilePath);
TagLib.Id3v2.AttachedPictureFrame cover = new TagLib.Id3v2.AttachedPictureFrame
{
Type = TagLib.PictureType.FrontCover,
Description = "Cover",
MimeType = System.Net.Mime.MediaTypeNames.Image.Jpeg,
Data = coverAndDetail.cover.ToBytes(),
TextEncoding = TagLib.StringType.UTF16
};
file.Tag.Pictures = new TagLib.IPicture[] { cover };
file.Tag.Performers = coverAndDetail.detail.songs[0].artists.Select(t => t.name).ToArray();
file.Tag.Title = coverAndDetail.detail.songs[0].name;
file.Tag.Album = coverAndDetail.detail.songs[0].album.name;
file.Save();
}
catch { }
});
}
downloadProgress.Report(new DownloadInfo
{
IsCompleted = true,
RecievedBytes = downloadProgress.Info.RecievedBytes,
TotalBytes = downloadProgress.Info.TotalBytes,
Speed = 0,
Result = "完成"
});
}