static public void backup()
{
if (NetClouldMusicData == null)
{
throw new InvalidOperationException("备份失败，NetClouldMusicData 对象为空");
}
//Task.Run(() =>
//{
if (File.Exists(GlobalConfigClass.XML_CLOUDMUSIC_SAVEPATH))
{
File.Delete(GlobalConfigClass.XML_CLOUDMUSIC_SAVEPATH);
}
OtherHelper.WriteXMLSerializer(NetClouldMusicData, typeof(List <UserData>), GlobalConfigClass.XML_CLOUDMUSIC_SAVEPATH);
// });
}