在wpf中访问datagrid内的组合框属性

<DataGrid x:Name="myDataGrid">
    <DataGrid.Columns>
        <DataGridTemplateColumn Header="属性">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <ComboBox ItemsSource="{Binding Path=属性列表}" SelectedItem="{Binding Path=选中的属性}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

// 获取选中行的数据对象
var selectedData = myDataGrid.SelectedItem;

// 通过数据对象获取组合框所在列的单元格
var cell = myDataGrid.Columns[0].GetCellContent(selectedData) as FrameworkElement;

// 通过单元格找到组合框控件
var comboBox = FindVisualChild<ComboBox>(cell);

// 访问组合框的属性
var selectedValue = comboBox.SelectedValue;
var selectedItem = comboBox.SelectedItem;

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