在WPF中使用Datagrid选中复选框

我想知道如何使用DataGridCheckBoxColumn选择多个行。

在这里，我只能选择一行，但是如何选择多项。

我的XAML如下：

<UserControl.Resources>
    <Style x:Key="itemstyle" TargetType="{x:Type DataGridRow}">
        <Style.Resources>
            <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="LightGoldenrodYellow" />
            <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Transparent" />
            <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="Black" />
            <SolidColorBrush x:Key="{x:Static SystemColors.ControlTextBrushKey}" Color="Black" />
        </Style.Resources>
        <Setter Property="HorizontalContentAlignment" Value="Stretch" />
        <Setter Property="IsSelected" Value="{Binding Path=IsSelected, Mode=TwoWay}" />
        <Style.Triggers>
            <MultiTrigger>
                <MultiTrigger.Conditions>
                    <Condition Property="ItemsControl.AlternationIndex" Value="1" />
                    <Condition Property="IsSelected" Value="False" />
                    <Condition Property="IsMouseOver" Value="False" />
                </MultiTrigger.Conditions>
                <Setter Property="Background" Value="#EEEEEEEE" />
            </MultiTrigger>
        </Style.Triggers>
    </Style>
</UserControl.Resources>

<Grid Width="500" Height ="300">
    <DataGrid ItemsSource="{Binding Path=Script}" HeadersVisibility="Column" SelectionMode="Single" AlternatingRowBackground="Gainsboro" Background="White" AutoGenerateColumns="False" ItemContainerStyle="{StaticResource itemstyle}" CanUserAddRows="True" GridLinesVisibility="None" Height="242" HorizontalAlignment="Left" HorizontalContentAlignment="Left"  IsEnabled="True" IsReadOnly="True"   Margin="10,14,0,44" Name="dgMain" RowHeight="23" VerticalAlignment="Center" VerticalContentAlignment="Center"  Width="478" >
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="MouseDoubleClick">
                <i:InvokeCommandAction Command="{Binding EditData}"/>
            </i:EventTrigger>
        </i:Interaction.Triggers>
        <DataGrid.Columns>
            <DataGridCheckBoxColumn Binding="{Binding Path=IsSelected}" Header="Select" Width="50" />
            <DataGridTextColumn Binding="{Binding Path=Script_Text}" Header="Script" Width="400" />
        </DataGrid.Columns>
    </DataGrid>
</Grid>

谢谢

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