WPF TreeView 项目被点击
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WPF TreeView item clicked
提问by Weixiang Guan
I am a problem with the event in WPF. Say I have a underlying data model and a tree view to present the data. The simplest thing I want to do is, when I click on one item, I would do something with underlying data associated with that item.
我对 WPF 中的事件有疑问。假设我有一个底层数据模型和一个树视图来呈现数据。我想要做的最简单的事情是，当我点击一个项目时，我会对与该项目相关联的基础数据做一些事情。
I tried using the MouseLeftButtonDownevent of the Textblock, but then the sender object is just the Textblockitself and I cannot get access to the underlying data.
我尝试使用 的MouseLeftButtonDown事件Textblock，但是发件人对象只是它Textblock本身，我无法访问基础数据。
Now I also tried using the MouseLeftButtonDownevent of the TreeViewItemlike this:
现在我也尝试使用这样的MouseLeftButtonDown事件TreeViewItem：
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<EventSetter Event="MouseLeftButtonDown" Handler="itemClicked"/>
</Style>
</TreeView.ItemContainerStyle>
But I did not get the handler called.
但是我没有得到处理程序的调用。
So how exactly should I do this? Is there some kind of standard approach?
那么我到底应该怎么做呢？是否有某种标准方法？
回答by makc
The MouseLeftButtonDown event is a bubbling event it got handled somewhere in its route my guess Selector. You can use snoop to see who handled the event. Using PreviewMouseLeftButtonDown/SelectedItemChanged or in your case MouseDoubleClick will solve the problem.
MouseLeftButtonDown 事件是一个冒泡事件，它在我猜测的选择器路径中的某处得到处理。您可以使用 snoop 来查看谁处理了事件。使用 PreviewMouseLeftButtonDown/SelectedItemChanged 或在您的情况下 MouseDoubleClick 将解决问题。
<TreeView>
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<EventSetter Event="MouseDoubleClick"
Handler="itemDoubleClicked"/>
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
