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----  treeNode节点如何设置为父节点  (http://foxtable.com/bbs/dispbbs.asp?boardid=2&id=170286)
--  作者：qq252476275
--  发布时间：2021/7/20 17:41:00
--  treeNode节点如何设置为父节点
treeView控件 动态加载树节点

需要设置一些节点为父节点，一些为子节点

点击父节点时可以加载其下的子节点
--  作者：qq252476275
--  发布时间：2021/7/20 17:42:00
--  
Dim ftp As new FTPClient
Dim dls As List(of String)
ftp.Host="192.168.66.218"
ftp.Account = "ftpUser"
ftp.Password = "123"
dls = ftp.GetDirList("")

Dim tree1 As WinForm.TreeView = e.Form.Controls("TreeView1")
Dim nd As WinForm.TreeNode
For Each dl As String In dls
    nd = tree1.Nodes.Add(dl)
    nd.
Next

dls = ftp.GetFileList("")
For Each dl As String In dls
    tree1.Nodes.Add(dl)    
Next

这样加载的
1   （文件夹）
2   （文件夹）
1.xls
2.xls

效果 ：

+1
+2
1.xls
2.xls
--  作者：qq252476275
--  发布时间：2021/7/20 18:55:00
--  
窗口afterShow事件

Dim labelPath As WinForm.Label = e.Form.Controls("Label4")
labelPath.text = ""

Dim ftp As new FTPClient
Dim dls As List(of String)
ftp.Host="192.168.66.218"
ftp.Account = "ftpUser"
ftp.Password = "123"
dls = ftp.GetDirList("")

Dim tree1 As WinForm.TreeView = e.Form.Controls("TreeView1")
Dim nd As WinForm.TreeNode
For Each dl As String In dls
    nd = tree1.Nodes.Add(dl,dl,"folder.ico")
    nd.Nodes.Add(dl,dl,"folder.icon")    \' 额外增加一个子节点，显示父节点有了+号
Next

dls = ftp.GetFileList("")
For Each dl As String In dls
    tree1.Nodes.Add(dl,dl,"file.ico")    
Next

在treeView控件的BeforeExpandNode时间中
Dim nd As WinForm.TreeNode

nd = e.Node
nd.Nodes.Clear

Dim strPath As String
strPath = nd.FullName

output.show(strPath)


Dim ftp As new FTPClient
Dim dls As List(of String)
ftp.Host="192.168.66.218"
ftp.Account = "ftpUser"
ftp.Password = "123"
dls = ftp.GetDirList(strPath)

Dim tree1 As WinForm.TreeView = e.Form.Controls("TreeView1")
Dim nd1 As WinForm.TreeNode
For Each dl As String In dls
    nd1 = nd.Nodes.Add(dl,dl,"folder.ico")
    nd1.Nodes.Add(dl,dl,"folder.icon")
Next

dls = ftp.GetFileList(strPath)
For Each dl As String In dls
    nd.Nodes.Add(dl,dl,"file.ico")    
Next

点击展开时，删除子节点，重新加载文件/文件夹， 遇到文件夹的继续额外增加子节点
--  作者：qq252476275
--  发布时间：2021/7/20 18:55:00
--  
不知是否有其他更简单的方法
--  作者：有点蓝
--  发布时间：2021/7/20 20:42:00
--  
只能这样