WPF AutoGeneratingColumn 绑定下拉框

WPF自动产生列，前台代码： 

<DataGrid x:Name="Dg" AutoGenerateColumns="True" CanUserAddRows="False"
                      AutoGeneratingColumn="Dg_OnAutoGeneratingColumn" 

 DataGrid绑定DataTable

private void TestPage_Loaded(object sender, RoutedEventArgs e)
        {
            var dt = new DataTable();
            dt.Columns.Add("ID");
            dt.Columns.Add("Name");
            dt.Columns.Add("gender");
            dt.Columns.Add("xAge");

            DataRow newRow = dt.NewRow();
            newRow["ID"] = "ID";
            newRow["Name"] = "Name";
            newRow["gender"] = "gender";
            newRow["xAge"] = "xAge";
            dt.Rows.Add(newRow);

            Dg.ItemsSource = dt.DefaultView;
        }

 因为数据源不固定（列名、列个数都不固定），所以必须自动生成列，并为每一列绑定下拉框；

下拉框的默认选中项为列的标题。实现字段映射功能

private void Dg_OnAutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
        {
            var sexType = new List<string> { "Age", "gender", "ID", "Name","Country" };
            var column = new DataGridTemplateColumn { Header = e.PropertyName };
            var dataTemplate = new DataTemplate();
            var fef = new FrameworkElementFactory(typeof(ComboBox));
            var binding = new Binding { Source = sexType };
            fef.SetBinding(ItemsControl.ItemsSourceProperty, binding);
            var selectVal = new Binding(e.PropertyName);//根据列名设置默认值
            fef.SetBinding(Selector.SelectedValueProperty, selectVal);
            dataTemplate.VisualTree = fef;
            column.CellTemplate = dataTemplate;
            e.Column = column;
            e.Column.Width = 100;
        }

 效果图：