如何检测Treeview是否具有TreeNodes（VB.Net/C#）

Question

我怎么知道TreeView是否有TreeNodes，无论它们是父节点还是子节点？我只是想避免重复。伪代码如下：

If TreeView1 has TreeNodes Then   
   'Remove old ones and create another   
   'Or Exit to skep creation of new ones  
Else  
   'Create TreeNodes  
End Sub 

Answer 1

您可以检查TreeView1.Nodes.Count，或者只需调用TreeView1.Nodes.Clear（）以确保在添加新的之前它始终清除

更新以获得更完整的答案：

If TreeView1.Nodes.Count = 0 Then   
   'Remove old ones and create another   
   'Or Exit to skep creation of new ones  
Else  
   'Create TreeNodes  
End Sub