上記の答えがうまくいくと確信しています。しかし、私は次のようにしてそれを整理することができました:
Dim backupfolder As String = netpath & "\MANUFPC BACKUP PROCESS\" & site & "\" & factory & "\" & line & "\" & pc
Dim mRootNode As New TreeNode
mRootNode.Text = pc
mRootNode.Tag = backupfolder
mRootNode.Nodes.Add("*DUMMY*")
'adds plus icon to allow extension
backupFolderDirectory.Nodes.Add(mRootNode)
次に、他の 2 つの関数:
Private Sub TreeView1_BeforeCollapse(ByVal sender As Object, ByVal e As TreeViewCancelEventArgs) Handles backupFolderDirectory.BeforeCollapse
' clear the node that is being collapsed
e.Node.Nodes.Clear()
' add a dummy TreeNode to the node being collapsed so it is expandable
e.Node.Nodes.Add("*DUMMY*")
End Sub
Private Sub TreeView1_BeforeExpand(ByVal sender As Object, ByVal e As TreeViewCancelEventArgs) Handles backupFolderDirectory.BeforeExpand
' clear the expanding node so we can re-populate it, or else we end up with duplicate nodes
e.Node.Nodes.Clear()
' get the directory representing this node
Dim mNodeDirectory As DirectoryInfo
mNodeDirectory = New DirectoryInfo(e.Node.Tag.ToString)
' add each subdirectory from the file system to the expanding node as a child node
Try
For Each mDirectory As DirectoryInfo In mNodeDirectory.GetDirectories
' declare a child TreeNode for the next subdirectory
Dim mDirectoryNode As New TreeNode
Dim mystring(1) As String
mystring(0) = mDirectory.FullName
mystring(1) = "directory"
' store the full path to this directory in the child TreeNode's Tag property
mDirectoryNode.Tag = mystring(0)
' set the child TreeNodes's display text
mDirectoryNode.Text = mDirectory.Name
' add a dummy TreeNode to this child TreeNode to make it expandable
mDirectoryNode.Nodes.Add("*DUMMY*")
' add this child TreeNode to the expanding TreeNode
e.Node.Nodes.Add(mDirectoryNode)
Next
For Each mFiles As FileInfo In mNodeDirectory.GetFiles
' declare a child TreeNode for the next subdirectory
Dim mFileNode As New TreeNode
Dim mystring(1) As String
mystring(0) = mFiles.FullName
mystring(1) = "file"
' store the full path to this directory in the child TreeNode's Tag property
mFileNode.Tag = mystring(0)
' set the child TreeNodes's display text
mFileNode.Text = mFiles.Name
' add this child TreeNode to the expanding TreeNode
e.Node.Nodes.Add(mFileNode)
Next
Catch ex As IOException
'sets up 2 different exceptions then the last one catches other exceptions that could be made from adding folder/files etc
e.Node.Remove()
MsgBox("Device/Folder not accessible", MsgBoxStyle.OkOnly, "Device not Ready")
Catch exc As NullReferenceException
e.Node.Remove()
MsgBox("Sorry this File/Folder can not be added", MsgBoxStyle.OkOnly, "Sorry")
Catch exce As Exception
e.Node.Remove()
MsgBox("Device/Folder not accessible", MsgBoxStyle.OkOnly, "Device not Ready")
End Try
End Sub