展开标题绑定don'；无法正确显示值（WPF/C#）

我正在使用数据绑定在

列表视图中显示一些数据。我正在使用标题来汇总我的数据，我想显示从itemsource中提取的文本，但不起作用。这部分代码有错误吗？如何为wpf提供正确的数据源

在Main.xml中，我用StructLog.cs类填充列表，并在wpf上显示列表中每个项目的数据。其他值正常工作，并且创建了标题，只是标题扩展器上的文本不显示

Main.xml

    List<StructLog> all = new List<StructLog>();
    foreach (ObservableCollection<StructLog> res in Patterns.Results)
    {
        foreach (StructLog r in res)
        {
            all.Add(r);
        }
    }

    lstResults.ItemsSource = all;

    CollectionView view = (CollectionView)CollectionViewSource.GetDefaultView(all);
    PropertyGroupDescription groupDescription = new PropertyGroupDescription("Pattern");
    view.GroupDescriptions.Add(groupDescription);

<ListView Name="lstResults" Grid.Row="1" IsEnabled="True" Grid.RowSpan="4" DataContext="Results" Grid.ColumnSpan="5" Margin="5,5">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="Linha" Width="Auto" DisplayMemberBinding="{Binding LineNumber}" />
            <GridViewColumn Header="Fonte" Width="Auto" DisplayMemberBinding="{Binding Source}" />
            <GridViewColumn Header="Data" Width="Auto" DisplayMemberBinding="{Binding Time}" />
            <GridViewColumn Header="Log" Width="Auto" DisplayMemberBinding="{Binding LineLog}" />
        </GridView>
    </ListView.View>

    <ListView.GroupStyle>
        <GroupStyle>
            <GroupStyle.ContainerStyle>
                <Style TargetType="{x:Type GroupItem}">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate>
                                <Expander IsExpanded="True">
                                    <Expander.Header>
                                        <StackPanel Orientation="Horizontal">
                                            <TextBlock Text="Teste:" FontWeight="Bold" Foreground="Gray" FontSize="22" VerticalAlignment="Bottom" />
                                            <TextBlock Text="{Binding Pattern}" FontWeight="Bold" Foreground="Gray" FontSize="22" VerticalAlignment="Bottom" />
                                         </StackPanel>
                                    </Expander.Header>
                                    <ItemsPresenter />
                                </Expander>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </GroupStyle.ContainerStyle>
        </GroupStyle>
    </ListView.GroupStyle>
</ListView>

Window.xaml

    List<StructLog> all = new List<StructLog>();
    foreach (ObservableCollection<StructLog> res in Patterns.Results)
    {
        foreach (StructLog r in res)
        {
            all.Add(r);
        }
    }

    lstResults.ItemsSource = all;

    CollectionView view = (CollectionView)CollectionViewSource.GetDefaultView(all);
    PropertyGroupDescription groupDescription = new PropertyGroupDescription("Pattern");
    view.GroupDescriptions.Add(groupDescription);

<ListView Name="lstResults" Grid.Row="1" IsEnabled="True" Grid.RowSpan="4" DataContext="Results" Grid.ColumnSpan="5" Margin="5,5">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="Linha" Width="Auto" DisplayMemberBinding="{Binding LineNumber}" />
            <GridViewColumn Header="Fonte" Width="Auto" DisplayMemberBinding="{Binding Source}" />
            <GridViewColumn Header="Data" Width="Auto" DisplayMemberBinding="{Binding Time}" />
            <GridViewColumn Header="Log" Width="Auto" DisplayMemberBinding="{Binding LineLog}" />
        </GridView>
    </ListView.View>

    <ListView.GroupStyle>
        <GroupStyle>
            <GroupStyle.ContainerStyle>
                <Style TargetType="{x:Type GroupItem}">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate>
                                <Expander IsExpanded="True">
                                    <Expander.Header>
                                        <StackPanel Orientation="Horizontal">
                                            <TextBlock Text="Teste:" FontWeight="Bold" Foreground="Gray" FontSize="22" VerticalAlignment="Bottom" />
                                            <TextBlock Text="{Binding Pattern}" FontWeight="Bold" Foreground="Gray" FontSize="22" VerticalAlignment="Bottom" />
                                         </StackPanel>
                                    </Expander.Header>
                                    <ItemsPresenter />
                                </Expander>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </GroupStyle.ContainerStyle>
        </GroupStyle>
    </ListView.GroupStyle>
</ListView>

为了在组标题中显示值，分组项目将显示在GroupItem类的items属性中。因此，您可以像Text=“{binding Items[0].Pattern}”这样进行绑定。这将绑定组中第一项的值，因为组中的所有值都将类似于按模式属性分组的值

试试这个

 <ListView.GroupStyle>
    <GroupStyle>
        <GroupStyle.ContainerStyle>
            <Style TargetType="{x:Type GroupItem}">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate>
                            <Expander IsExpanded="True">
                                <Expander.Header>
                                    <StackPanel Orientation="Horizontal">
                                        <TextBlock Text="Teste:" FontWeight="Bold" Foreground="Gray" FontSize="22" VerticalAlignment="Bottom" />
                                        <TextBlock Text="{Binding Items[0].Pattern}" FontWeight="Bold" Foreground="Gray" FontSize="22" VerticalAlignment="Bottom" />
                                     </StackPanel>
                                </Expander.Header>
                                <ItemsPresenter />
                            </Expander>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </GroupStyle.ContainerStyle>
    </GroupStyle>
</ListView.GroupStyle>