ListView grouping - missing text (WPF, c#, XAML)

Question

I'm trying display ListView grouping. I did as below:

ListView.xaml. cs

    ListViewModel lvm = new ListViewModel();
    lvUsers3.ItemsSource = lvm.getData();
    CollectionView view = (CollectionView)CollectionViewSource.GetDefaultView(lvUsers3.ItemsSource);
    PropertyGroupDescription groupDescription = new PropertyGroupDescription("Type");
    view.GroupDescriptions.Add(groupDescription);

ListView. xaml

<ListView Name="lvUsers3" Margin="0,197,94,0" ItemsSource="{Binding tvq}">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="FirstName" Width="100" DisplayMemberBinding="{Binding FirstName}" />
            <GridViewColumn Header="LastName" Width="100" DisplayMemberBinding="{Binding LastName}" />
        </GridView>
    </ListView.View>

    <ListView.GroupStyle>
        <GroupStyle>
            <GroupStyle.HeaderTemplate>
                <DataTemplate>
                    <TextBlock FontWeight="Bold" FontSize="14" FontStyle="Normal" Text="{Binding Type}" />
                </DataTemplate>
            </GroupStyle.HeaderTemplate>
        </GroupStyle>
    </ListView.GroupStyle>
</ListView>

ListViewModel. cs

namespace LayoutMVVM.ViewModels
{
    public class ListViewModel
    {

        public List<test_view> getData()
        {
        testViewClassDataContext tv = new testViewClassDataContext();
        List<test_view> tvq = (from tt in tv.test_views
                               select tt).ToList();

            return tvq;
        }        

    }
}

On result I see that is grouped but the "type" value is missing (like was hidden?)

Answer 1

When you have applied the grouping you have created a group object that contains your sub items and this is what you are binding your group header to

the group object doesn't contain a Type property to bind to

try "{Binding Name}" instead of "{Binding Type}"