原文: MVVM裡綁定TreeView控件的SelectedItem
<TreeView x:Name="treeView">
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectedItemChanged">
<i:InvokeCommandAction
Command="{Binding SetSelectedItemCommand}"
CommandParameter="{Binding SelectedItem, ElementName=treeView}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</TreeView>
來源:http://stackoverflow.com/questions/9143107/get-selected-treeviewitem-using-mvvm