获取 WPF Treeview 的 SelectedItem
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/17113173/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Get SelectedItem of WPF Treeview
提问by TSM
I am making a WPF application with MVVM Light, and I have the following TreeView:
我正在使用 MVVM Light 制作 WPF 应用程序，并且我有以下 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>
When the selection is changed, I want to send the newly selected item as an argument to the command. Is there any way to do this? I was under the impression that you could do this with EventToCommand, but when I try to use them, it says they are no longer supported in version 4, and I can't find a suitable workaround.
When the selection is changed, I want to send the newly selected item as an argument to the command. 有没有办法做到这一点？我的印象是您可以使用 EventToCommand 来做到这一点，但是当我尝试使用它们时，它说版本 4 不再支持它们，我找不到合适的解决方法。
Thanks.
谢谢。
回答by agugglez
When you specify CommandParameter="SelectedItemChanged"you are specifying the paramater as a string.
当您指定时，CommandParameter="SelectedItemChanged"您将参数指定为string.
If you want to pass the SelectedItem as the parameter, you should do it like this: CommandParameter="{Binding ElementName=TreeView,Path=SelectedItem}".
如果你想通过的SelectedItem作为参数，你应该这样做是这样的：CommandParameter="{Binding ElementName=TreeView,Path=SelectedItem}"。
