Linq To Xml为单击事件分配属性

本文关键字：事件 分配 属性 单击 To Xml Linq | 更新日期: 2023-09-27 18:20:07

我做了一块响板作为自己的练习。我想解析XML文件中的URI，并将它们绑定到单个mediaelement。我有八个按钮，我想触发不同的音频文件。我只有一个页面，所以我不能使用NavigationContext.QueryString将属性id作为查询字符串传递给LINQ。如何根据按下的按钮更改属性？

这是代码：

音频类别：

public class AudioClass
{
    string audio;
    public string Audio 
    {
        get { return audio; }
        set { audio = value; }
    }
}

代码：

public partial class MainPage : PhoneApplicationPage
{
    string name = "C";
    public MainPage()
    {
        InitializeComponent();    
    }
    protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
    {
        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.Relative);
        base.OnNavigatedTo(e);
    }
    private void C_Key_Click(object sender, RoutedEventArgs e)
    {
        player.Play();
    }
    private void D_Key_Click(object sender, RoutedEventArgs e)
    {
        player.Play();
    }

和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>

Linq To Xml为单击事件分配属性

  1. 从OnNavigatedTo()中提取SetPlayerSource()

  2. 在通用按钮单击事件处理程序中使用SetPlayerSource()。

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