在Silverlight 5中新增了一个SoundEffect类和SoundEffectInstance类用以加载wav格式的音乐，这样可以很及时的为动画添加音效。
现在我们看如何使用这两个类来控制播放wav音乐，首先引入mav音乐格式的文件（音频采样大小必须为16或者8位不能是24位，采用PCM编码，22.5, 44.1 or 48khz的采样率）如下图属性：
其次将引入的wav格式音乐文件在项目中右键点击其属性设置其“生成操作”为“内容”，如下图所示：
现在我们准备XAML代码以控制SoundEffectInstance类的属性，调节音乐播放效果：
< Grid x:Name = " LayoutRoot " Background = " White " >
<!-- 准备3个Silder控件以控制音乐效果 -->
< Slider Height = " 135 " HorizontalAlignment = " Left " Margin = " 62,38,0,0 "
Name = " SlVolume " VerticalAlignment = " Top " Width = " 62 "
Orientation = " Vertical " Maximum = " 1 " Value = " 0.5 " />
< Slider Height = " 135 " HorizontalAlignment = " Left " Margin = " 162,38,0,0 "
Name = " SlPitch " VerticalAlignment = " Top " Width = " 62 "
Orientation = " Vertical " Value = " 0 " Maximum = " 1 " Minimum = " -1 " />
< Slider Height = " 135 " HorizontalAlignment = " Left " Margin = " 262,38,0,0 "
Name = " SlPan " VerticalAlignment = " Top " Width = " 62 "
Orientation = " Vertical " Value = " 0 " Maximum = " 1 " Minimum = " -1 " />
<!-- 显示名称 -->
< TextBlock Height = " 23 " HorizontalAlignment = " Left " Margin = " 71,179,0,0 "
Name = " textBlock1 " Text = " 音量调节 " VerticalAlignment = " Top " />
< TextBlock Height = " 23 " HorizontalAlignment = " Left " Margin = " 166,179,0,0 "
Name = " textBlock2 " Text = " 高低音调节 " VerticalAlignment = " Top " />
< TextBlock Height = " 23 " HorizontalAlignment = " Left " Margin = " 271,179,0,0 "
Name = " textBlock3 " Text = " 声道平衡 " VerticalAlignment = " Top " />
</ Grid >
第一步：加载相应的事件
public MainPage()
{
InitializeComponent();
// 第一步：加载相应的事件
Loaded += new RoutedEventHandler(MainPage_Loaded);
this .SlVolume.ValueChanged +=
new RoutedPropertyChangedEventHandler < double > (SlVolume_ValueChanged);
this .SlPitch.ValueChanged +=
new RoutedPropertyChangedEventHandler < double > (SlPitch_ValueChanged);
this .SlPan.ValueChanged +=
new RoutedPropertyChangedEventHandler < double > (SlPan_ValueChanged);
}
第二步：加载声音WAV文件
第三步：设置声音文件初始化播放属性
void MainPage_Loaded( object sender, RoutedEventArgs e)
{
GetSound();
}
SoundEffect _soundEffect;
SoundEffectInstance instance;
public void GetSound()
{
// 第二步：加载声音WAV文件
var laserStream =
Application.GetResourceStream( new Uri( " zhizu.wav " , UriKind.RelativeOrAbsolute));
_soundEffect = SoundEffect.FromStream(laserStream.Stream);
// 第三步：设置声音文件初始化播放属性
instance = _soundEffect.CreateInstance();
// Pitch变调效果属性，是高低音平衡调节，该值在-1到1之间设置
instance.Pitch = 0.0f ;
// Pan声像调节属性，它用于调节该路声源在空间的分布图像。
instance.Pan = 0.0f ;
// Volume属性是音量大小调节，该值范围是0-1
instance.Volume = 0.5f ;
instance.Play();
}
第四步：根据Silder控件值的变化动态调节声音属性
private void SlVolume_ValueChanged( object sender,
RoutedPropertyChangedEventArgs < double > e)
{
// 第四步：调节声音属性
instance.Volume = float .Parse(e.NewValue.ToString());
this .textBlock1.Text = " 音量调节 " + e.NewValue.ToString();
}
private void SlPitch_ValueChanged( object sender,
RoutedPropertyChangedEventArgs < double > e)
{
// 第四步：调节声音属性
instance.Pitch = float .Parse(e.NewValue.ToString());
this .textBlock2.Text = " 高低音调节 " + e.NewValue.ToString();
}
private void SlPan_ValueChanged( object sender,
RoutedPropertyChangedEventArgs < double > e)
{
// 第四步：调节声音属性
instance.Pan = float .Parse(e.NewValue.ToString());
this .textBlock3.Text = " 声像调节 " + e.NewValue.ToString();
}
注意SoundEffectInstance类的3个音乐效果属性Volume,Pitch,Pan如下：
SoundEffectInstance.Pitch
// Pitch变调效果属性，是高低音平衡调节，该值在-1到1之间设置
// 当往-1调节时，即往低音调调节
// 当往+1调节时，即往高音调调节
// 如果是0则正常音高
SoundEffectInstance.Volume
// Volume属性是音量大小调节，该值范围是0-1
SoundEffectInstance.Pan
//Pan声像调节属性，它用于调节该路声源在空间的分布图像。
//当往-1调节时，相当于把该路声源放在听音的左边。
//当往+1调节时，相当于把该路声源放在听音的右边。
//若把它置于中间位置0时，相当于把该路声源放在听音的正中。
//Pan属性是左右声道平衡，该值在-1到1之间设置
最后我们来看运行效果如下图，如果要听试听效果请点击 SL5SoundEffect.zip 下载源码。
本文转自程兴亮博客园博客，原文链接：http://www.cnblogs.com/chengxingliang/archive/2011/04/21/2022407.html，如需转载请自行联系原作者
