wpf listbox分组显示

1.Xaml部分

<Grid>
        <ListBox Name="lbMain" ItemsSource="{Binding CollectionModelFile}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Height="30" Orientation="Horizontal">
                        <Label Width="20"/>
                        <CheckBox IsChecked="{Binding IsChecked}" VerticalAlignment="Center"/>
                        <TextBlock Text="{Binding FilterCond}" Margin="5 0 10 0" VerticalAlignment="Center"/>
                        <TextBox Text="{Binding FilterValue}" Width="60" VerticalAlignment="Center"/>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
            <ListBox.GroupStyle>
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type GroupItem}">
                                        <Expander  IsExpanded="True"
                                          ExpandDirection="Down" Header="{Binding ItemCount}">
                                            <!--<Expander.Header>
                                                <StackPanel Orientation="Horizontal">
                                                    <CheckBox IsChecked="{Binding IsChecked}"/>
                                                    <TextBox Width="100" Text="{Binding ElementName=btn_1,Path=Content}"/>
                                                    <TextBox Width="100"   DataContext="{Binding ElementName=btn_1,Path=Content}"/>
                                                   
                                                    <TextBlock Text="{Binding Path=ItemCount, StringFormat=数量:{0}}"
                                                       VerticalAlignment="Center"
                                                       Margin="5,0,0,0" Width="50"/>
                                                </StackPanel>
                                            </Expander.Header>-->
                                            <ItemsPresenter />
                                        </Expander>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
            </ListBox.GroupStyle>
        </ListBox>
        <Button x:Name="btn_1" Content="123" Height="50" Width="50" VerticalAlignment="Top" Click="Button_Click" Margin="216,0,534,0"/>
    </Grid>

2.后台部分

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WorkFlowControl
{
    /// <summary>
    /// UserControl1.xaml 的交互逻辑
    /// </summary>
    public partial class UserControl1 : UserControl
    {
        public class ModelFile
        {
            public int Num { get; set; }
            public bool IsChecked { get; set; }
            public string FilterCond { get; set; }
            public double FilterValue { get; set; }
        }
        public ObservableCollection<ModelFile> CollectionModelFile = new ObservableCollection<ModelFile>();

        public UserControl1()
        {
            InitializeComponent();
            CollectionModelFile.Add(new ModelFile() { Num = 0 ,IsChecked=true,FilterCond="Width",FilterValue=512});
            CollectionModelFile.Add(new ModelFile() { Num = 0 ,IsChecked=true,FilterCond="Height",FilterValue=7});
            CollectionModelFile.Add(new ModelFile() { Num = 0 ,IsChecked=true,FilterCond="Length",FilterValue=3});

            CollectionModelFile.Add(new ModelFile() { Num = 1 ,IsChecked=true,FilterCond="Width",FilterValue=50});
            CollectionModelFile.Add(new ModelFile() { Num = 2 ,IsChecked=true,FilterCond="height",FilterValue=50});




            lbMain.ItemsSource = CollectionModelFile;

            ICollectionView cv = CollectionViewSource.GetDefaultView(lbMain.ItemsSource);
            cv.GroupDescriptions.Add(new PropertyGroupDescription("Num"));
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {

        }
    }
}

3.显示