主题：[求助]能否只提取子目录字符

用目录树方式选择用户，为了方便选择部门则选择了该部门的所有用户，但在信息发送时不需要部门，只需要用户名，能否将部门给剔除。

Dim s As String
Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")
For Each nd As WinForm.TreeNode In trv.AllNodes
    If nd.Checked Then
        s = s & "," & nd.Text
    End If
Next
If s = "" Then
    e.Form.DropDownBox.Value = ""
Else
    e.Form.DropDownBox.Value = s.trim(",")
End If
e.Form.DropDownBox.CloseDropdown