WPF:TreeView 获取父节点 [英] WPF: TreeView get parent node

问题描述

问题简述:

 Node 1
     Child x
     Child Y
 Node 2
     Child z

在处理TreeView类型时，选择父节点时，SelectedItem属性返回一个TreeViewItem类型的对象，下面正常工作

When dealing with TreeView type, when selecting a parent node, the SelectedItem property returns an object of type TreeViewItem and the following works properly

 TreeViewItem parentNode = (TreeViewItem) treeView.SelectedItem;

This while, this property return a String when a value of a node is selected which means in that case the following will be true:

This while, this property return a String when a value of a node is selected which means in that case the following will be true:

 Boolean valueType = treeView.SelectedItem is String; --> True 

因此，我们不能再将对象转换为 TreeViewItem.

Accordingly, we cannot cast the object to the TreeViewItem anymore.

假设你有以下内容

IEnumerable<IGrouping<String, Childs>> treeModel;

并且您想知道子节点属于哪个节点，如何从TreeView 中获取父节点元素.

And you want to know to which node the child belongs, how would you obtain the parent node element from the TreeView.

推荐答案

不幸的是，SO 中的所有帖子都指出了错误的解决方案，或者由于我解释的原因而可能不再起作用的解决方案.(同样适用于所有 Microsoft 文档，可能已经过时)

Unfortunately all post in SO point out to the wrong solution, or a solution which may no longer work due to the reason I explained. (The same applies to all Microsoft documentation, maybe outdated)

这似乎没有 **Built-In** 功能，所以决定设计我自己的解决方案.这个问题可以通过创建一个自定义的TreeViewItem 类并添加一个ParentNodeValue 属性来解决.

There seems to be no **Built-In** feature to this, so decided to design my own solution. This problem can be solved, by creating a customized TreeViewItem class and adding a ParentNodeValue property.

public class AdvancedTreeViewItem<T>: TreeViewItem{
    public T ParentNodeValue {get; set;}
    public T RootParentNodeValue {get; set;}
}

我们可以执行以下操作来获取节点值:

And we can do the following to get the node value:

var selectedValue = (AdvancedTreeViewItem<String>)treeView.SelectedItem;
MessageBox.Show(selectedValue.RootParentNodeValue);

在这种方法中，SelectedItem 属性无法返回 String

In this approach, there is no way the SelectedItem property would return a String

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