/// <summary>
/// 创建歌单与歌曲的关联
/// </summary>
/// <param name="userId"></param>
/// <param name="playListId"></param>
/// <param name="songId"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
public async Task <RelPlayListSong> Create([Required] string userId, [Required] string playListId, [Required] string songId, CancellationToken cancellationToken = default(CancellationToken))
{
// 查询是否存在
var p = (from pls in Context.RelPlayListSongs
where pls.PlayListId == playListId && pls.SongId == songId
select new RelPlayListSong(pls)).SingleOrDefault();
if (p != null)
{
// 添加操作日志
return(p);
}
var playListSong = new RelPlayListSong
{
PlayListId = playListId,
SongId = songId
};
Context.Add(playListSong);
try
{
await Context.SaveChangesAsync(cancellationToken); // TODO 添加日志
}
catch (DbUpdateConcurrencyException e)
{
throw new Exception("WS------ StoreBase中保存改变时: \r\n", e);
}
return(playListSong);
}
/// <summary>
/// 删除歌单歌曲关联
/// </summary>
/// <param name="userId"></param>
/// <param name="rel"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
public async Task <RelPlayListSong> Delete([Required] string userId, [Required] RelPlayListSong rel, CancellationToken cancellationToken = default(CancellationToken))
{
return(await Delete(userId, rel.PlayListId, rel.SongId, cancellationToken));
}
