WPF 把数据绑定到下拉列表

 <DataGrid x:Name="BagInfo" ItemsSource="{Binding AdditionalList,Mode=TwoWay}" Height="auto"  AutoGenerateColumns="False" SelectionMode="Single"  SelectionUnit="Cell"   CanUserAddRows="False"

                                    ColumnHeaderHeight="30"     CanUserReorderColumns="False"   ColumnWidth="SizeToCells"       

                CanUserDeleteRows="False" CanUserSortColumns="False"

                AlternatingRowBackground="#f6f6f6"

                AlternationCount="2"    EnableColumnVirtualization="False" EnableRowVirtualization="False">

                            

                            <DataGrid.ContextMenu>

                                <ContextMenu>

                                    <MenuItem Header="复制整行" Click="CopyRowMenuItem_Click" />

                                    <MenuItem Header="复制单元格" Click="CopyCellMenuItem_Click" />

                                    <MenuItem Header="导出Excel" Click="ExportExcelMenuItem_Click" />

                                </ContextMenu>

                            </DataGrid.ContextMenu>

                            <DataGrid.Columns>

                                <DataGridTextColumn Header="姓名" Binding="{Binding Passengername}" IsReadOnly="True" />

                                <DataGridTextColumn Header="服务类型" Binding="{Binding AdditionalType}"  MinWidth="100"/>

                                <DataGridTextColumn Header="数量" Binding="{Binding CurrentStyle}"  MinWidth="100"/>

                                <DataGridTextColumn Header="价格" Binding="{Binding CurrentParty}"  MinWidth="100"/>

                                <DataGridTemplateColumn Header="购买" MinWidth="80">

                                    <DataGridTemplateColumn.CellTemplate>

                                        <DataTemplate>

                                            <CheckBox x:Name="AdditionalALL" IsChecked="True"  Click="cbAdditional_Click" />

                                        </DataTemplate>

                                    </DataGridTemplateColumn.CellTemplate>

                                </DataGridTemplateColumn>

                            </DataGrid.Columns>

                        </DataGrid>

 foreach (Service oService in oFlightSegment.Service)

                                                        {

                                                            additional.CurrentParty = oService.Price;

                                                            additional.CurrentStyle = oService.Descriptions;

                                                            additional.MarkupStyle.Add(oService.Descriptions);

                                                            additional.ApplicableParty.Add(oService.Price);

                                                            additional.ApplicableBag.Add(oService.Currency);

                                                            additional.TotalQuantity.Add(oService.TotalQuantity);

                                                        }