vb.net 如何使用vb.net在树视图控件中从下到上查找子节点的所有父节点
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How to find the all parent node of a child node from bottom to top in tree view control using vb.net
提问by Piyush
Here i have below Treeview as shown in image.
如图所示，我在下面的 Treeview 中有。
for child node G gi want to fetch all the parent nodes name from bottom to top and store into list. means in list should add G g, F f, D d, B b.
对于子节点，G g我想从底部到顶部获取所有父节点名称并存储到列表中。表示列表中应添加 G g, F f, D d, B b。
please suggest the solution.
请提出解决方案。
thanks in advance...
提前致谢...
采纳答案by Piyush
I have created one function for it which will add all the parent in the list until parent is not nothing for the selected node.
我为它创建了一个函数，它将添加列表中的所有父级，直到父级对于所选节点不是空的。
Public Function AllParents() As List(of String)
Dim listOfNodeHierarchy As New List(Of String)
listOfNodeHierarchy.Add(node.ToString)
'If Child Node has parent, add the parent name of the Child node to the list
While (node.Parent IsNot Nothing)
listOfNodeHierarchy.Add(node.Parent)
node = node.Parent
End While
return listOfNodeHierarchy
End Function
回答by Harval
This code will help you to obtain information about the parents node.
此代码将帮助您获取有关父节点的信息。
dim selectedNode as treeNode = YourTreeViewSelectedNode
dim nodePath as string= "" 'will store the full path
'You get the full Path of the node like 'Parent\Child\GrandChild
'The Procedure will fill nodePath
ObtainNodePath(selectedNode,nodePath)
msgbox(nodePath)
Private Sub ObtainNodePath(ByVal node As TreeNode, ByRef path As String)
If node.Parent IsNot Nothing Then
path = IO.Path.Combine(node.Text, path) ' Parent\Child
If node.Parent.Level = 0 Then Exit Sub
'Call again the method to check if can extract more info
ObtainNodePath(node.Parent, path)
End If
End Sub
回答by LarsTech
If you just need the list of text of the parent nodes, you can simply use the FullPath property of the selected node:
如果您只需要父节点的文本列表，您可以简单地使用所选节点的 FullPath 属性：
For Each s As String In _
TreeView1.SelectedNode.FullPath.Split(TreeView1.PathSeparator).Reverse
If you need the list of nodes, just keep checking the parent until it's nothing:
如果您需要节点列表，只需继续检查父节点，直到它什么都没有：
Private Function ParentNodes(fromNode As TreeNode) As IEnumerable(Of TreeNode)
Dim result As New List(Of TreeNode)
While fromNode IsNot Nothing
result.Add(fromNode)
fromNode = fromNode.Parent
End While
Return result
End Function
