如何将数据绑定到嵌套的datagrid？让parentGrid变得可折叠的小贴士？

// 数据模型
public class ParentItem
{
    public string Name { get; set; }
    public bool IsExpanded { get; set; }
    public List<ChildItem> Children { get; set; }
}

public class ChildItem
{
    public string Name { get; set; }
    public int Age { get; set; }
}

// 在父级DataGrid的列定义中添加模板
<DataGrid AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Name" Binding="{Binding Name}" />
        <DataGridTemplateColumn Header="Children">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <DataGrid ItemsSource="{Binding Children}" AutoGenerateColumns="False">
                        <DataGrid.Columns>
                            <DataGridTextColumn Header="Name" Binding="{Binding Name}" />
                            <DataGridTextColumn Header="Age" Binding="{Binding Age}" />
                        </DataGrid.Columns>
                    </DataGrid>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

// 在父级DataGrid的代码中提供展开和折叠的逻辑
private void ToggleExpansion(ParentItem item)
{
    item.IsExpanded = !item.IsExpanded;
}

// 可折叠的父级DataGrid的样式
<Style TargetType="DataGrid">
    <Setter Property="RowDetailsVisibilityMode" Value="Collapsed" />
    <Style.Triggers>
        <DataTrigger Binding="{Binding IsExpanded}" Value="True">
            <Setter Property="RowDetailsVisibilityMode" Value="Visible" />
        </DataTrigger>
    </Style.Triggers>
</Style>