C# A namespace cannot directly contain members such as fields or methods for void

Question

This is my code im trying to make a stop, pause and start button and im fairly new to programming but the void bit is giving me an error, A namespace cannot directly contain members such as fields or methods.

void MusicPlayer_CurrentStateChanged(object sender, RoutedEventArgs e)
{
    switch (musicPlayer.CurrentState)
    {
        case MediaElementState.Playing:
            systemControls.PlaybackStatus = MediaPlaybackStatus.Playing;
            break;
        case MediaElementState.Paused:
            systemControls.PlaybackStatus = MediaPlaybackStatus.Paused;
            break;
        case MediaElementState.Stopped:
            systemControls.PlaybackStatus = MediaPlaybackStatus.Stopped;
            break;
        case MediaElementState.Closed:
            systemControls.PlaybackStatus = MediaPlaybackStatus.Closed;
            break;
        default:
            break;
}

}

Answer 1

您可能缺少一个类，并且正在直接在名称空间中编写方法。