c# - 计算机休眠后 MediaPlayer 无法播放

Question

每次单击按钮时，以下代码都会播放一段简短的声音(一个简单的 wav 文件)。
但是在将计算机置于 sleep 状态并再次唤醒它之后 - 单击按钮时它不再播放声音(尽管正在调用事件处理程序 Button_Click)。为什么？
编码:

public partial class MainWindow : Window
{
    MediaPlayer player1;

    public MainWindow()
    {
        InitializeComponent();
        player1 = new MediaPlayer();
        player1.Open(new Uri("Some\\Path\\sound.wav"));
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        player1.Position = TimeSpan.Zero;
        player1.Play();
    }
}

我知道我可以 Open当用户再次登录时再次访问该文件。但这不应该被需要。

Answer 1

我在我的应用程序中所做的只是被称为 player1.Stop();当 Windows 将进入挂起模式时。
主窗口.xaml

<Window ...
    Loaded="Window_Loaded">
    <Grid Margin="5">
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Button Click="Button_PlayResume" >Play/Resume</Button>
        <Button Click="Button_Pause" Grid.Row="1">Pause</Button>        
    </Grid>
</Window>

主窗口.xaml.cs

public partial class MainWindow : Window
{
    MediaPlayer player1;

    // Last play position before going to suspend mode
    private TimeSpan LastPosition = TimeSpan.Zero;

    public MainWindow()
    {
        InitializeComponent();
        player1 = new MediaPlayer();
        player1.MediaEnded += Player1_MediaEnded;            
    }

    private void OpenMedia()
    {
        player1.Open(new Uri(@"M:\Sting.wav"));
        //player1.Open(new Uri(@"M:\ring.wav"));
    }

    private void Player1_MediaEnded(object sender, EventArgs e)
    {
        LastPosition = TimeSpan.Zero;            
    }

    private void Button_PlayResume(object sender, RoutedEventArgs e)
    {
        if (LastPosition != TimeSpan.Zero)
        {
            player1.Position = LastPosition; // Resume    
            LastPosition = TimeSpan.Zero;               
        }
        else
        {
            OpenMedia();
        }
        player1.Play();
    }

    private void Button_Pause(object sender, RoutedEventArgs e)
    {            
        player1.Pause();
        LastPosition = player1.Position;
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        SystemEvents.PowerModeChanged += OnPowerModeChanged;
    }

    private void OnPowerModeChanged(object sender, PowerModeChangedEventArgs e)
    {
        if (e.Mode == PowerModes.Suspend)
        {
            if (player1.CanPause)
            {
                player1.Pause();
                LastPosition = player1.Position;
            }
            player1.Stop();
        }
    }
}

屏幕截图:

即使在 MediaPlayer 时，这也将起作用正在玩什么。
从 sleep 模式恢复后，按播放/恢复按钮从最新位置继续播放。