WPF——CollectionView

 1  
 2 <Window x:Class="MainWindow"
 3         Loaded="Window_Loaded">
 4 
 5 <ListBox x:Name="lstPeople" Width="200">
 6             <ListBox.ItemTemplate>
 7                 <DataTemplate>
 8                     <StackPanel>
 9                         <StackPanel Orientation="Horizontal">
10                             <TextBlock Text="{Binding LastName}" />
11                             <TextBlock Text=", " />
12                             <TextBlock Text="{Binding FirstName}" />
13                         </StackPanel>
14                         <TextBlock Text="{Binding State}" />
15                         <TextBlock Text="{Binding Dateofbirth}" />
16                     </StackPanel>             
17                 </DataTemplate>
18             </ListBox.ItemTemplate>
19         </ListBox>
20           
21         <StackPanel Orientation="Horizontal" Grid.Row="1">
22             <Button x:Name="btnSortbylast" Content="Sort By LastName" Click="btnSortbylast_Click" />
23             <Button x:Name="btnSortbydob" Content="Sort By DOB" Click="btnSortbydob_Click" />
24             <Button x:Name="btnFilter" Content="Show Smiths" Click="btnFilter_Click" />
25         </StackPanel> 

 

 1         private Collection<Person> people = new Collection<Person>();
 2         private bool isfiltered = false;
 3         
 4         private void btnSortbylast_Click(object sender, RoutedEventArgs e)
 5         {
 6             //CollectionView, 表示用于分组、排序、筛选和导航数据集合的视图。
 7             CollectionView cv = (CollectionView)CollectionViewSource.GetDefaultView(lstPeople.ItemsSource);
 8             cv.SortDescriptions.Clear();
 9             cv.SortDescriptions.Add(new SortDescription("LastName", ListSortDirection.Ascending));
10         }
11 
12         private void btnSortbydob_Click(object sender, RoutedEventArgs e)
13         {
14             CollectionView cv = (CollectionView)CollectionViewSource.GetDefaultView(lstPeople.ItemsSource);
15             cv.SortDescriptions.Clear();
16             cv.SortDescriptions.Add(new SortDescription("Dateofbirth", ListSortDirection.Descending));
17         }
18 
19         private void btnFilter_Click(object sender, RoutedEventArgs e)
20         {
21             CollectionView cv = (CollectionView)CollectionViewSource.GetDefaultView(lstPeople.ItemsSource);
22             if(isfiltered)
23             {
24                 cv.Filter=null;
25                 isfiltered=false;
26             }else{
27                 cv.Filter = new Predicate<object>(FilterBySmith);
28                 isfiltered=true;
29             }
30         }
31         
32         private bool FilterBySmith(object item)
33         {
34             Person p = item as Person;
35             return p.LastName.Trim()=="Smith";
36         }
37 
38         private void Window_Loaded(object sender, RoutedEventArgs e)
39         {
40             people.Add(new Person() {FirstName="Tom", LastName="Smith", State="NY", Dateofbirth=new DateTime(1962, 10, 30)});
41             people.Add(new Person() { FirstName = "John", LastName = "Doe", State = "CA", Dateofbirth = new DateTime(1970, 3, 20) });
42             people.Add(new Person() { FirstName = "Jane", LastName = "Doe", State = "AL", Dateofbirth = new DateTime(1970, 3, 20) });
43             people.Add(new Person() { FirstName = "Bill", LastName = "Johnson", State = "CA", Dateofbirth = new DateTime(1970, 3, 20) });
44             people.Add(new Person() { FirstName = "Stacey", LastName = "Zany", State = "GA", Dateofbirth = new DateTime(1970, 3, 20) });
45             people.Add(new Person() { FirstName = "Liz", LastName = "Smith", State = "TX", Dateofbirth = new DateTime(1970, 3, 20) });
46             people.Add(new Person() { FirstName = "Jim", LastName = "Jones", State = "TX", Dateofbirth = new DateTime(1970, 3, 20) });
47             
48             lstPeople.ItemsSource=people;
49         }
50     }
51     
52     public class Person
53     {
54         public string FirstName { get; set; }
55         public string LastName { get; set; }
56         public string State { get; set; }
57         public DateTime Dateofbirth { get; set; }
58     }