导致BackgroundAudioPlayer.get_Position()处出现System.Runtime.Inte
本文关键字:System Runtime Inte get BackgroundAudioPlayer Position 导致 | 更新日期: 2023-09-27 18:21:40
有时我在试图获取BackgroundAudioPlayer.Instance的位置时会遇到异常。这种情况很少发生,但我已经能够获得StackTrace。奇怪的是,这个代码是在播放曲目时每秒执行一次的。这个错误的原因可能是什么?
我得到这个StackTrace。
System.SystemException: HRESULT = 0xC00D36C4 ---> System.Runtime.InteropServices.COMException: Exception from HRESULT: 0xC00D36C4 at
Microsoft.Phone.BackgroundAudio.Interop.IAudioPlaybackManager.get_CurrentPosition() at
Microsoft.Phone.BackgroundAudio.BackgroundAudioPlayer.get_Position() --- End of inner exception stack trace --- at
Microsoft.Phone.BackgroundAudio.BackgroundAudioPlayer.get_Position() at
MC.PodCast.Common.ViewModel.PlayerViewModel.UpdateTrackPosition() at
MC.PodCast.Common.ViewModel.PlayerViewModel.ReactToBackgroundAudioPlayer() at
MC.PodCast.Common.ViewModel.PlayerViewModel.Initialize() at
MC.PodCast.Common.ViewModel.PlayerViewModel.<<get_InitializeCommand>b__5>d__6.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__0(Object state)
当然,我使用的代码非常简单。
public void UpdateTrackPosition()
{
if (_backgroundAudioPlayer != null && _backgroundAudioPlayer.Track != null)
{
Position = _backgroundAudioPlayer.Position;
}
else
{
Position = null;
}
}
该代码链接到MF_MEDIA_ENGINE_ERR_SRC_NOT_SUPPORTED,但我猜您确实有声音。
我发现BackgroundAudioPlyer可能非常奇怪。我用一个"安全"扩展方法来包装我的大部分调用。
示例
public static PlayState PlayerStateSafe(this BackgroundAudioPlayer source)
{
PlayState state;
try
{
state = source.PlayerState;
}
catch (InvalidOperationException)
{
state = PlayState.Unknown;
}
return state;
}