如题，怎样设为数组？

Dim ss As String

Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")
For Each nd As WinForm.TreeNode In trv.AllNodes
    If nd.Checked AndAlso nd.level = 1 Then
        ss = ss & "," & nd.Text
        \'Dim ary() As String = ss.split(",") 

    End If
Next

为什么要设置成数组？用集合不可以？

http://www.foxtable.com/webhelp/scr/0217.htm

我是想给目录树选中的用户发信息。原先是用列表框进行选择，因为人数太多，改为多选目录树，但两段代码没能衔接好，请老师帮忙，谢谢！

1、

Dim ss As String

Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")
For Each nd As WinForm.TreeNode In trv.AllNodes
    If nd.Checked AndAlso nd.level = 1 Then
        ss = ss & "," & nd.Text
        \'Dim ary() As String = ss.split(",") 

    End If
Next

2、

 \'Dim ary() As String = e.Form.Controls("CheckedListBox1").Value.split(",")   \'复选列表框用户名
  For Each s As String In Ary
        \'msgbox(s)
        For Each u As UserInfo In Users
            If s = u.Name Then
                 QQClient.Send(u.Group & "." & u.Name,Date.Now & "-" & User.name & "-" & "留言:" & vbcrlf & e.Form.Controls("TextBox1").text,True)      
                 QQClient.SendChatMessage(u.Group & "." & u.Name,"{!}好友给你留言,请查看!")
             End If
          Next
   Next

If nd.Checked AndAlso nd.level = 1 Then
        Dim ary() As String = nd.fullpath.split("\\") 

 QQClient.Send(ary(0) & "." & ary(1),Date.Now & "-" & User.name & "-" & "留言:" & vbcrlf & e.Form.Controls("TextBox1").text,True)      

    End If