DevExpress TreeList不显示子节点，而是显示为根节点 [英] DevExpress TreeList not displaying child nodes and displaying as root nodes instead

问题描述

我从List(Of LedgerAccountEntry)()中读取了TreeList.

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

表单加载:

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

稍后:

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

这些只是相关的部分.如果您需要更多信息，请告诉我.

These are just the relevant parts. Please let me know if you need more info.

结果是没有子节点的扁平树，我检查了ID是否存在并已正确返回.

The result is flat tree with no child nodes, I checked that the IDs exists and are being returned correctly.

推荐答案

这是因为您将ParentLedgerAccountSys用作字段.您需要将ParentLedgerAccountSys转换为属性，或添加另一个表示您的ParentLedgerAccountSys字段的属性.
这是示例:

This is because you are using ParentLedgerAccountSys as field. You need to convert your ParentLedgerAccountSys to property or add another property which represents your ParentLedgerAccountSys field.
Here is example:

Public Class LedgerAccountEntry
    Public Property LedgerAccountSys As Integer
    'Public ParentLedgerAccountSys As Integer <-- Here is field.
    Public Property ParentLedgerAccountSys As Integer '<-- Here is property instead of field.
    '
    '
    ' ETC
End Class

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