why my Listbox data binding using DataContext is not working?

Question

I am new to WPF and data binding, here I have a Listbox which works just fine:

    <ListBox 
        x:Name="listBox" ItemsSource="{Binding Path=AllFriends}">

        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Name}" />
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

Now I want to try DataContext so I use:

<UserControl.Resources>
    <CollectionViewSource
      x:Key="FriendsGroups" 
      Source="{Binding Path=AllFriends}"
      >
    </CollectionViewSource>
</UserControl.Resources>

   <ListBox 
        x:Name="listBox" 
        DataContext="{StaticResource FriendsGroups}">

        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Name}" />
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

But this one is not working. I would appreciate if you could tell me why?

Answer 1

即使您使用CollectionViewSource，仍然需要设置ItemsSource属性，而不是DataContext：

<ListBox ItemsSource="{Binding Source={StaticResource FriendsGroups}}">