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我创建了一个声音播放器，可以在任何给定时间从一组声音中播放一个特定的声音。集合中的其中一个声音需要以循环方式播放。下面是我的代码：

    public class SoundService : ISoundService
{
    private Dictionary<string, SoundPlayer> SoundCollections { get; set; }
    private SoundPlayer _soundPlayerPlaceHolder;
    private readonly CancellationTokenSource _cancellationToken = new CancellationTokenSource();
    private CancellationToken _token;

    public void Play(SoundType soundType)
    {
        _token = _cancellationToken.Token;
        Task.Factory.StartNew(() => PlaySound(soundType), _token);
    }

    private void PlayLooping(SoundType soundType)
    {
        if (!SoundCollections.ContainsKey(soundType.ToString()))
        {
            s_Log.Error("Error retrieving sound from Sound collection. XXX.SoundService");
            return;
        }
        _soundPlayerPlaceHolder = SoundCollections[soundType.ToString()];
        if (_token.IsCancellationRequested)
        {
            if (_soundPlayerPlaceHolder != null)
            {
                _soundPlayerPlaceHolder.Stop();
                _soundPlayerPlaceHolder = null;
            }
            return;
        }

        _soundPlayerPlaceHolder.PlayLooping();

    }

    public void StopSound()
    {
        _cancellationToken.Cancel();
    }

    public void LoadSounds()
    {
        var sounds = Enum.GetValues(typeof (SoundType));
        SoundCollections = new Dictionary<string,SoundPlayer>();
        foreach (var soundType in sounds)
        {
            var resourceName = GetResourceNameAttribute(soundType);
            if (string.IsNullOrEmpty(resourceName))
                continue;

            try
            {
                var stream = Resources.ResourceManager.GetStream(resourceName);

                var soundPlayer = new SoundPlayer(stream);
                soundPlayer.LoadAsync();

                SoundCollections.Add(soundType.ToString(), soundPlayer);
                s_Log.Info(string.Format(@"loading sound {0}", soundType));
            }
            catch (Exception e)
            {
                s_Log.Error(e);
            }
        }

    }

    private string GetResourceNameAttribute(object enumToQuery)
    {
        var fi = enumToQuery.GetType().GetField(enumToQuery.ToString());

        var attributes = (ResourceNameAttribute[])fi.GetCustomAttributes(
            typeof(ResourceNameAttribute), false);

        return attributes.Length > 0 ? attributes[0].ResourceName : enumToQuery.ToString();
    }


    /// <summary>
    /// .
    /// </summary>
    /// <param name="aSoundType"></param>
    private void PlaySound(SoundType aSoundType)
    {
        s_Log.Info("loading sound {0}", aSoundType.ToString());

        if (aSoundType == SoundType.ItemNotFound)
        {
            PlayLooping(aSoundType);
        }
        else
        {
            if (_soundPlayerPlaceHolder == null)
            SoundCollections[aSoundType.ToString()].Play();
        }
    }
}

我遇到的问题是在声音播放器循环播放（正在工作）并且取消令牌被取消后，我无法再循环播放相同的声音。我不确定为什么会这样，我尝试了许多其他线程选项（任务、BackgroundWorker），但我没有运气。单曲工作正常，它只是重播循环那不起作用。没有例外，日志中没有任何内容......我迷路了......想法？

4

1 回答 1

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这样的菜鸟......每次调用该方法时，取消标记都是相同的。所以当我在任务没有触发之前取消它时...... Derp。

于 2013-11-26T06:05:15.780 回答