[Windows Phone 7璀璨]北漂1.0在线歌词播放器二.歌曲按艺术家分类实现
一.实现歌曲按艺术家分类达到快速定位用到了LongListSelector控件
国外资料：
http://www.windowsphonegeek.com/articles/wp7-longlistselector-in-depth--part2-data-binding-scenarios
二.编码实现
2.1页面XAML代码
View Code
1 <phone:PhoneApplicationPage.Resources>
2 <DataTemplate x:Key="GroupHeader">
3 <Border Background="{StaticResource PhoneAccentBrush}" Margin="3">
4 <TextBlock Text="{Binding Key}" Height="40" FontSize="30"></TextBlock>
5 </Border>
6 </DataTemplate>
7 <DataTemplate x:Key="GroupSongItem">
8 <Border Width="480" Height="50" Background="{StaticResource PhoneAccentBrush}" Margin="3">
9 <TextBlock Text="{Binding Key}" FontSize="30" Foreground="White"></TextBlock>
10 </Border>
11 </DataTemplate>
12 <DataTemplate x:Key="SongItem">
13 <StackPanel>
14 <TextBlock Text="{Binding Name}" FontSize="30" ></TextBlock>
15 <TextBlock Text="{Binding Artist}"></TextBlock>
16 </StackPanel>
17 </DataTemplate>
18 </phone:PhoneApplicationPage.Resources>
19 <!--LayoutRoot 是包含所有页面内容的根网格-->
20 <Grid x:Name="LayoutRoot" Background="Transparent">
21 <toolkit:LongListSelector x:Name="SongList"
22 ItemTemplate="{StaticResource SongItem}"
23 GroupHeaderTemplate="{StaticResource GroupHeader}"
24 GroupItemTemplate="{StaticResource GroupSongItem}" SelectionChanged="SongList_SelectionChanged"/>
25
26
27 </Grid>
2.2分组实现Group<T>代码
View Code
///<summary>
/// 分组实现
///</summary>
///<typeparam name="T"></typeparam>
public class Group<T> : IEnumerable<T>
{
public string Key { get; set; }
public IList<T> Items { get; set; }
public Group(string key, IEnumerable<T> Item)
{
this.Key = key;
this.Items = new List<T>(Item);
}
public override bool Equals(object obj)
{
Group<T> NowGroup = obj as Group<T>;
return (NowGroup != null) && (this.Key.Equals(NowGroup.Key));
}
#region
public IEnumerator<T> GetEnumerator()
{
return this.Items.GetEnumerator();
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return this.Items.GetEnumerator();
}
#endregion
}
2.3数据绑定代码(用到LINQ分组排序)
View Code
1 void get()
2 {
3 //装载歌曲集合
4 songs = libary.Songs;
5 //根据艺术家分组排序给LISTBOX
6 var music = from s in songs
7 group s by s.Artist into newmusic
8 select new Group<Song>(newmusic.Key.ToString(),newmusic);
9 //绑定数据
10 SongList.ItemsSource = music;
11
12
13
14 }
2.4歌曲选中播放事件
View Code
1 private void SongList_SelectionChanged(object sender, SelectionChangedEventArgs e)
2 {
3 if (this.SongList.SelectedItem != null)
4 {
5 //获取选中项
6 string SelectsongName = this.SongList.SelectedItem.ToString();
7 int i = -1;
8 //遍历歌曲集合
9 foreach (var item in songs)
10 {
11 i++;
12 //如果找到歌曲
13 if (item.Name == SelectsongName)
14 {
15 MediaPlayer.Play(songs, i);
16
17 }
18
19 }
20 //对歌曲按照歌名排序
21 var songGobye = from s in songs
22 orderby s.Name
23 select songs;
24
25
26 foreach (var item in songGobye)
27 {
28 songs = item;
29
30 }
31
32
33 }
34
35
36 }
