用SelectedItem在网格中填充DataGridComboBox

<DataGrid ItemsSource="{Binding Items}" AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridComboBoxColumn Header="Options" SelectedItemBinding="{Binding SelectedItem}">
            <DataGridComboBoxColumn.ElementStyle>
                <Style TargetType="ComboBox">
                    <Setter Property="ItemsSource" Value="{Binding Options}" />
                    <Setter Property="DisplayMemberPath" Value="Name" />
                    <Setter Property="SelectedValuePath" Value="Value" />
                </Style>
            </DataGridComboBoxColumn.ElementStyle>
            <DataGridComboBoxColumn.EditingElementStyle>
                <Style TargetType="ComboBox">
                    <Setter Property="ItemsSource" Value="{Binding Options}" />
                    <Setter Property="DisplayMemberPath" Value="Name" />
                    <Setter Property="SelectedValuePath" Value="Value" />
                </Style>
            </DataGridComboBoxColumn.EditingElementStyle>
        </DataGridComboBoxColumn>
    </DataGrid.Columns>
</DataGrid>