DevExpress TreeList不显示子节点,而是显示为根节点

我有一个 TreeList 从 List(Of LedgerAccountEntry)() .

Public Class LedgerAccountEntry
    Public Property LedgerAccountSys() As Integer 
    Public ParentLedgerAccountSys As Integer
    '
    '
    ' ETC
End Class

形式荷载:

tlLedgerAccounts.ParentFieldName = "ParentLedgerAccountSys"
tlLedgerAccounts.KeyFieldName = "LedgerAccountSys"
tlLedgerAccounts.RootValue = -1

后来:

While bla
    entry.LedgerAccountSys = rstAccounts("LedgerAccountSys").Value
    entry.ParentLedgerAccountSys = IIf(rstAccounts("ParentLedgerAccountSys").Value Is DBNull.Value, -1, rstAccounts("ParentLedgerAccountSys").Value)
    lst.add(entry)
End While            
tlLedgerAccounts.DataSource = lst

这些只是相关部分。如果你需要更多信息,请告诉我。

结果是没有子节点的扁平树,我检查了ID是否存在,并且是否正确返回。