wpf 如何将命令绑定到 TreeView 的 SelectedItemChanged 事件
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How to bind a Command to SelectedItemChanged event of a TreeView
提问by user1874589
There is a Treeview Control.
有一个树视图控件。
<TreeView Name="ProductsHierarchy" FontFamily="Arial"
Background="White" Margin="2"
FontSize="12" SelectedItemChanged ="ProductsHierarchy_SelectedItemChanged">
Is there a way to bind a command for SelectedItemChanged event of the treeview, avoiding the code behind event handler?
有没有办法为树视图的 SelectedItemChanged 事件绑定命令，避免事件处理程序背后的代码？
回答by amnezjak
Try MVVM Toolkit's EventToCommand.
"Built-in" (from Blend) approach is to use Interactivity
“内置”（来自 Blend）方法是使用交互性
<TreeView Name="ProductsHierarchy" FontFamily="Arial"
Background="White" Margin="2"
FontSize="12" SelectedItemChanged ="ProductsHierarchy_SelectedItemChanged">
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectedItemChanged">
<i:InvokeCommandAction Command="{Binding SelectedItemChangedCommand}" CommandParameter="argument"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</TreeView>
You must include namespace:
您必须包含命名空间：
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
The disadvantage here is that you have no access to EventArgs. Here's the solution(it's in Polish, but code samples are pretty much self-explanatory).
这里的缺点是您无法访问EventArgs. 这是解决方案（它是波兰语，但代码示例几乎不言自明）。
