MediaElement AutoPlay ="False"错误

Question

我正在从XML解析多个音频文件uri并将它们绑定到MediaElement的Source属性.我有八个按钮可以触发音频文件.当AutoPlay属性设置为True时,一切都很好.每个按钮都会触发正确的音频文件.但是因为我不希望音频在页面加载后立即开始播放我将自动播放设置为False.现在什么都不行.页面加载但按钮不会触发音频文件.我该如何解决这个bug？

码:

public partial class MainPage : PhoneApplicationPage
{
    string name = "C";

    public MainPage()
    {
        InitializeComponent();
    }

    protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
    {
        SetPlayerSource();
        base.OnNavigatedTo(e);
    }

    private void SetPlayerSource()
    {
        XDocument audioPlayer = XDocument.Load("Audio.xml");

        var aani = (from audio in audioPlayer.Descendants("Note")
                    where audio.Attribute("id").Value == name
                    select new AudioClass
                    {
                        Audio = (string)audio.Element("url").Value

                    }).SingleOrDefault();

        player.Source = new Uri(aani.Audio, UriKind.RelativeOrAbsolute);
    }


    private void C_Key_Click(object sender, RoutedEventArgs e)
    {
        var buttonName = (sender as Button).Name;
        var underscorePos = buttonName.IndexOf('_');
        name = buttonName.Substring(0, underscorePos);
        SetPlayerSource();
        player.Play();

    }

    private void D_Key_Click(object sender, RoutedEventArgs e)
    {
        var buttonName = (sender as Button).Name;
        var underscorePos = buttonName.IndexOf('_');
        name = buttonName.Substring(0, underscorePos);
        SetPlayerSource();
        player.Play();
    }

XAML:

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="41,-8,-17,8">
        <Button x:Name="C_key" Content="" HorizontalAlignment="Left" Height="220" Margin="8,0,0,8" Style="{StaticResource C}" VerticalAlignment="Bottom" Width="75" Click="C_Key_Click"/>
        <Button x:Name="D_key" Content="" HorizontalAlignment="Left" Height="220" Margin="87,0,0,8" Style="{StaticResource D}" VerticalAlignment="Bottom" Width="75" Click="D_Key_Click"/>
        <Button x:Name="E_key" Content="" HorizontalAlignment="Left" Height="220" Margin="166,0,0,8" Style="{StaticResource E}" VerticalAlignment="Bottom" Width="75" Click="E_Key_Click"/>
        <Button x:Name="F_key" Content="" HorizontalAlignment="Left" Height="220" Margin="245,0,0,8" Style="{StaticResource F}" VerticalAlignment="Bottom" Width="75" d:LayoutOverrides="Width" Click="F_Key_Click"/>
        <Button x:Name="G_key" Content="" Height="220" Margin="324,0,305,8" Style="{StaticResource G}" VerticalAlignment="Bottom" Click="G_Key_Click"/>
        <Button x:Name="A_key" Content="" HorizontalAlignment="Right" Height="220" Margin="0,0,226,8" Style="{StaticResource A}" VerticalAlignment="Bottom" Width="75" Click="A_Key_Click"/>
        <Button x:Name="B_key" Content="" HorizontalAlignment="Right" Height="220" Margin="0,0,147,8" Style="{StaticResource B}" VerticalAlignment="Bottom" Width="75" Click="B_Key_Click"/>
        <Button x:Name="C2_key" Content="" HorizontalAlignment="Right" Height="220" Margin="0,0,68,8" Style="{StaticResource C2}" VerticalAlignment="Bottom" Width="75" Click="C2_Key_Click"/>
        <MediaElement Height="120" HorizontalAlignment="Left" Margin="8,6,0,0" Name="player" VerticalAlignment="Top" Width="160" Source="{Binding Audio}" Volume="1" AutoPlay="False"/>
     </Grid>

Answer 1

按照MSDN你应该设置AutoPlay到false 之前设置的Source属性.

在设置时Source,SetPlayerSource可以从XAML中删除setter.除此之外,代码看起来不错.

但是,我刚刚意识到你在打电话Play后直接打电话SetPlayerSource.在尝试播放媒体之前,这不会让您的代码有时间实际加载媒体.

你需要打电话Play给这个MediaOpened活动.