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我试图按照此 Microsoft 帖子中的说明进行操作：http: //support.microsoft.com/default.aspx ?scid=kb;en-us;209891

创建基于自引用表的组织层次结构图，就像示例一样。我不断收到一个错误，即变量未定义并且 VBA 指向“Optional varReportToID As Variant”行，但说明说不要为此参数提供任何内容。我可以做些什么来使代码运行吗？我没有更改代码，我更改了表上的命名以匹配列出的变量。我在 MS Access 2010 中工作，但该示例适用于旧版本的 MS。

谢谢！

Option Explicit

'=================Load Event for the Form=======================
'Initiates the routine to fill the TreeView control
'============================================================

Public Sub Form_Load()
    Const strTableQueryName = "Employees"
    Dim db As DAO.Database, rst As DAO.Recordset
    Set db = CurrentDb
    Set rst = db.OpenRecordset(strTableQueryName, dbOpenDynaset, dbReadOnly)
    AddBranch rst:=rst, strPointerField:="ReportsTo", strIDField:="EmployeeID",      strTextField:="LastName"
End Sub

'================= AddBranch Sub Procedure ======================
'      Recursive Procedure to add branches to TreeView Control
'Requires:
'   ActiveX Control:  TreeView Control
'              Name:  xTree
'Parameters:
'               rst:  Self-referencing Recordset containing the data
'   strPointerField:  Name of field pointing to parent's primary key
'        strIDField:  Name of parent's primary key field
'      strTextField:  Name of field containing text to be displayed
'=============================================================
Sub AddBranch(rst As Recordset, strPointerField As String, _
          strIDField As String, strTextField As String, _
          Optional varReportToID As Variant)
    On Error GoTo errAddBranch
    Dim nodCurrent As Node, objTree As TreeView
    Dim strCriteria As String, strText As String, strKey As String
    Dim nodParent As Node, bk As String
    Set objTree = Me!xTree.Object
    If IsMissing(varReportToID) Then  ' Root Branch.
        strCriteria = strPointerField & " Is Null"
    Else  ' Search for records pointing to parent.
        strCriteria = BuildCriteria(strPointerField, _
            rst.Fields(strPointerField).Type, "=" & varReportToID)
        Set nodParent = objTree.Nodes("a" & varReportToID)
    End If

    ' Find the first emp to report to the boss node.
    rst.FindFirst strCriteria
    Do Until rst.NoMatch
        ' Create a string with LastName.
        strText = rst(strTextField)
        strKey = "a" & rst(strIDField)
        If Not IsMissing(varReportToID) Then  'add new node to the parent
            Set nodCurrent = objTree.Nodes.Add(nodParent, tvwChild, strKey, strText)
        Else    ' Add new node to the root.
            Set nodCurrent = objTree.Nodes.Add(, , strKey, strText)
        End If
        ' Save your place in the recordset so we can pass by ref for speed.
        bk = rst.Bookmark
        ' Add employees who report to this node.
        AddBranch rst, strPointerField, strIDField, strTextField, rst(strIDField)
        rst.Bookmark = bk     ' Return to last place and continue search.
        rst.FindNext strCriteria   ' Find next employee.
    Loop

'--------------------------Error Trapping --------------------------
    errAddBranch:
        MsgBox "Can't add child:  " & Err.Description, vbCritical, "AddBranch Error:"
        Resume exitAddBranch
End Sub
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