Question

我所拥有的是一个包含对象列表的对象，每个对象都包含另一个具有属性等的对象列表。

目前我使用传递方法来添加到那些嵌套对象，就像在这个极其简化的例子中一样：

Public Class clsA

Private objB As List(Of clsB) = New List(Of clsB)

Public Sub New()
    objB.Add(New clsB)
End Sub

Public Sub AddInt(ByVal BIndex As Int32, ByVal CIndex As Int32, ByVal Number As Int32)
    objB(BIndex).AddInt(CIndex, Number)
End Sub

End Class

Public Class clsB

Private objC As List(Of clsC) = New List(Of clsC)

Public Sub New()
    objC.Add(New clsC)
End Sub

Public Sub AddInt(ByVal CIndex As Int32, ByVal Number As Int32)
    objC(CIndex).AddInt(Number)
End Sub

End Class

Public Class clsC

Private lstNum As List(Of Int32) = New List(Of Int32)

Public Sub AddInt(ByVal Number As Int32)
    lstNum.Add(Number)
End Sub

End Class

与以下相比，似乎正确的编码标准会告诉我这是正确的：

Public Class clsD

Public objE As List(Of clsE) = New List(Of clsE)

Public Sub New()
    objE.Add(New clsE)
End Sub

End Class

Public Class clsE

Public objF As List(Of clsF) = New List(Of clsF)

Public Sub New()
    objF.Add(New clsF)
End Sub

End Class

Public Class clsF

Public lstNum As List(Of Int32) = New List(Of Int32)

End Class

是否存在某种方法可以接受的情况？或者传递设置总是首选吗？

Public Class Form1

Dim oA As clsA = New clsA
Dim oD As clsD = New clsD

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    oA.AddInt(0, 0, 3)
    oD.objE(0).objF(0).lstNum.Add(3)

End Sub
End Class

Answer 1

考虑一下整个.NET Framework是如何完成的。该集合应分配给私有字段，并通过公共只读属性公开。

Public Class Thing

    Private _stuff As New List(Of Thing)

    Public ReadOnly Property Stuff() As List(Of Thing)
        Get
            Return _stuff
        End Get
    End Property

End Class

然后，调用者可以直接访问该集合以调用其Add方法等，但无法分配整个新集合。各处都有例子：Control.Controls，ListBox.Items，ComboBox.Items，ListView.Items，DataSet.Tables，DataSet.Relations，DataTable.Rows，{{1等等，等等。

传递方法直接访问嵌套对象

1 个答案: