正在尝试从DropDownClosed事件处理程序的DataGrid内的ComboBox DataTemplate获取当前选定的项

<DataGrid>
    <DataGrid.Columns>
        <DataGridTemplateColumn>
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <ComboBox DropDownClosed="ComboBox_DropDownClosed">
                        <!-- ComboBox的数据源和其他设置 -->
                    </ComboBox>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

private void ComboBox_DropDownClosed(object sender, EventArgs e)
{
    ComboBox comboBox = sender as ComboBox;
    DataGridRow dataGridRow = FindVisualParent<DataGridRow>(comboBox);
    
    // 获取选定的项
    var selectedItem = comboBox.SelectedItem;
    
    // 其他处理逻辑
}

private static T FindVisualParent<T>(DependencyObject child) where T : DependencyObject
{
    DependencyObject parentObject = VisualTreeHelper.GetParent(child);
    
    if (parentObject == null)
        return null;
    
    T parent = parentObject as T;
    if (parent != null)
        return parent;
    
    return FindVisualParent<T>(parentObject);
}