Windows phone 8 在wp8中保存铃声

我想知道为什么我不能在windows phone上保存铃声

SaveRingtone ringtone = new SaveRingtone();
ringtone.Source = new Uri("appdata:/"+path);
ringtone.DisplayName = b.Content.ToString();
ringtone.Completed += Ringtone_Save_completed;
ringtone.Show();

这是我的代码

你离我太近了

SaveRingtone类是SaveRingtoneTask

SaveRingtoneTask ringtone = new SaveRingtoneTask();
ringtone.Source = new Uri("appdata:/"+path);
ringtone.DisplayName = b.Content.ToString();
ringtone.Completed += Ringtone_Save_completed;
ringtone.Show();

您需要添加

using Microsoft.Phone.Tasks;