在DataGridComboBoxColumn中编辑单元格时，如何获取当前单元格值？

private void DataGrid_SelectedCellsChanged(object sender, SelectedCellsChangedEventArgs e)
{
    DataGrid dataGrid = (DataGrid)sender;
    
    foreach (DataGridCellInfo cellInfo in dataGrid.SelectedCells)
    {
        if (cellInfo.Column is DataGridComboBoxColumn)
        {
            DataGridComboBoxColumn comboBoxColumn = (DataGridComboBoxColumn)cellInfo.Column;
            DataGridRow row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromItem(cellInfo.Item);
            
            if (row != null)
            {
                FrameworkElement element = comboBoxColumn.GetCellContent(row);
                
                if (element is ComboBox)
                {
                    ComboBox comboBox = (ComboBox)element;
                    object selectedValue = comboBox.SelectedValue;
                    
                    // 处理获取到的值
                    // ...
                }
            }
        }
    }
}