带有复选框的WPF ListView取消选中

<ListView>
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <Setter Property="IsSelected" Value="{Binding IsChecked, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type CheckBox}}}"/>
        </Style>
    </ListView.ItemContainerStyle>
    <ListView.View>
        <GridView>
            <GridViewColumn>
                <GridViewColumn.Header>
                    <CheckBox x:Name="SelectAllCheckBox" Content="全选" Checked="SelectAllCheckBox_Checked" Unchecked="SelectAllCheckBox_Unchecked"/>
                </GridViewColumn.Header>
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <CheckBox IsChecked="{Binding IsSelected, RelativeSource={RelativeSource AncestorType={x:Type ListViewItem}}}"/>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
            <!-- 其他列 -->
        </GridView>
    </ListView.View>
</ListView>

private void SelectAllCheckBox_Checked(object sender, RoutedEventArgs e)
{
    foreach (var item in listView.Items)
    {
        var listViewItem = listView.ItemContainerGenerator.ContainerFromItem(item) as ListViewItem;
        var checkBox = FindVisualChild<CheckBox>(listViewItem);
        checkBox.IsChecked = true;
    }
}

private void SelectAllCheckBox_Unchecked(object sender, RoutedEventArgs e)
{
    foreach (var item in listView.Items)
    {
        var listViewItem = listView.ItemContainerGenerator.ContainerFromItem(item) as ListViewItem;
        var checkBox = FindVisualChild<CheckBox>(listViewItem);
        checkBox.IsChecked = false;
    }
}

private T FindVisualChild<T>(DependencyObject obj) where T : DependencyObject
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
    {
        var child = VisualTreeHelper.GetChild(obj, i);
        if (child != null && child is T)
            return (T)child;
        else
        {
            var childOfChild = FindVisualChild<T>(child);
            if (childOfChild != null)
                return childOfChild;
        }
    }
    return null;
}