Private Sub Command2_Click()
Dim I As Long
For I = 1 To TreeView1.Nodes.Count
TreeView1.Nodes(I).Expanded = True '展开所有节点
Next I
End Sub
Private Sub Command3_Click()
Dim I As Long
For I = 1 To TreeView1.Nodes.Count
TreeView1.Nodes(I).Expanded = False '收起所有节点
Next I
End Sub
效 果: