How to access the root node of a treeview using VB?

In VB, the root node of a TreeView control can be accessed through the Nodes property of the TreeView control.

Here is an example code to obtain the root node of a TreeView control:

Dim rootNode As TreeNode
rootNode = TreeView1.Nodes(0)   ' 获取第一个根节点

In the above code, TreeView1 is the name of the TreeView control, the Nodes property returns the collection of nodes in the TreeView control, and specific root nodes can be accessed by index. Root nodes are indexed starting from 0.

If there is only one root node in the TreeView control, you can directly use TreeView1.Nodes(0) to access the root node.

If there are multiple root nodes in the TreeView control, you can use different index values as needed to retrieve specific root nodes.