获取WPF Treeview的SelectedItem

Question

我正在使用MVVM Light创建一个WPF应用程序,我有以下TreeView:

<TreeView x:Name="TreeView" 
                  Grid.Column="2" 
                  HorizontalAlignment="Left" Height="463.481" VerticalAlignment="Top" Width="263" 
                  ItemsSource="{Binding PackageView}" Margin="0,5.657,0,0" Grid.Row="1" Grid.RowSpan="2" Grid.ColumnSpan="2">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="SelectedItemChanged">
                    <i:InvokeCommandAction Command="{Binding Command}" 
                    CommandParameter="SelectedItemChanged"/>
                </i:EventTrigger>
            </i:Interaction.Triggers>
            <TreeView.ItemContainerStyle>
                <Style TargetType="{x:Type TreeViewItem}">
                    <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
                    <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
                    <Setter Property="FontWeight" Value="Normal" />
                    <Style.Triggers>
                        <Trigger Property="IsSelected" Value="True">
                            <Setter Property="FontWeight" Value="Bold" />
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </TreeView.ItemContainerStyle>

当选择被更改时,我想将新选择的项目作为参数发送到命令.有没有办法做到这一点？我的印象是你可以使用EventToCommand做到这一点,但是当我尝试使用它们时,它表示版本4中不再支持它们,我找不到合适的解决方法.

谢谢.

Answer 1

当您指定CommandParameter="SelectedItemChanged"将参数指定为a时string.

如果你想传递SelectedItem作为参数,你应该这样做:CommandParameter="{Binding ElementName=TreeView,Path=SelectedItem}".