在Windows Phone应用程序中，我们可以将音频文件直接放到程序包里面，然后在程序中就可以通过MediaElement元素，用相对的路径进行加载音频文件来播放。

下面给出播放程序音乐的示例：播放应用程序本地加载的音乐。

代码清单8-1：播放程序音乐（源代码：第8章\Examples_8_1）
MainPage.xaml文件主要代码
------------------------------------------------------------------------------------------------------------------
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <MediaElement x:Name="sound" />
            <TextBlock Text="请选择你要播放的歌曲"
 FontSize="30" Height="59" HorizontalAlignment="Left" Margin="6,6,0,0" Name="textBlock1" VerticalAlignment="Top" Width="409" />
            <RadioButton Content="罗志祥-Touch My Heart"
Height="72" HorizontalAlignment="Left" Margin="0,71,0,0" Name="radioButton1" VerticalAlignment="Top" Width="394" IsChecked="True" />
            <RadioButton Content="陈小春-独家记忆"
Height="72" HorizontalAlignment="Left" Margin="0,149,0,0" Name="radioButton2" VerticalAlignment="Top" />
            <RadioButton Content="大灿-贝多芬的悲伤"
Height="72" HorizontalAlignment="Left" Margin="0,227,0,0" Name="radioButton3" VerticalAlignment="Top" />
            <RadioButton Content="筷子兄弟-老男孩"
Height="72" HorizontalAlignment="Left" Margin="0,305,0,0" Name="radioButton4" VerticalAlignment="Top" />
            <RadioButton Content="梁静茹-比较爱"
Height="72" HorizontalAlignment="Left" Margin="0,383,0,0" Name="radioButton5" VerticalAlignment="Top" />
            <!—播放按钮触发播放的事件-->
            <Button Content="播放"
Height="72" HorizontalAlignment="Left" Margin="0,476,0,0" Name="play" VerticalAlignment="Top" Width="160" Click="play_Click" />
            <!—暂停按钮触发暂停的事件-->
            <Button Content="暂停"
Height="72" HorizontalAlignment="Left" Margin="135,476,0,0" Name="pause" VerticalAlignment="Top" Width="160" Click="pause_Click" />
 <!—暂停按钮触发暂停的事件-->
            <Button Content="停止"
Height="72" HorizontalAlignment="Left" Margin="272,476,0,0" Name="stop" VerticalAlignment="Top" Width="160" Click="stop_Click" />    
        </Grid>
MainPage.xaml.cs文件主要代码
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        //播放音乐
        private void play_Click(object sender, RoutedEventArgs e)
        {
            //设置MediaElement的源
            if (radioButton1.IsChecked==true)
            {
                sound.Source = new Uri("TouchMyHeart.html", UriKind.Relative);
            }
            else if (radioButton2.IsChecked == true)
            {
                sound.Source = new Uri("TouchMyHeart.html", UriKind.Relative);
            }
            else if (radioButton3.IsChecked == true)
            {
                sound.Source = new Uri("TouchMyHeart.html", UriKind.Relative);
            }
            else if (radioButton4.IsChecked == true)
            {
                sound.Source = new Uri("TouchMyHeart.html", UriKind.Relative);
            }
            else if (radioButton5.IsChecked == true)
            {
                sound.Source = new Uri("TouchMyHeart.html", UriKind.Relative);
            }
            else
            {
                sound.Source = new Uri("TouchMyHeart.html", UriKind.Relative);
            }
            //播放
            sound.Play();
        }
        //暂停播放音乐
        private void pause_Click(object sender, RoutedEventArgs e)
        {
            sound.Pause();
        }
        //停止播放音乐
        private void stop_Click(object sender, RoutedEventArgs e)
        {
            sound.Stop();
        }

程序运行的效果如图8.1所示。