VB Reference parent member of a class through a child when using List Of(T)

Question

If I start by pointing you to this question here, which was perfectly answered for what I needed, only for one problem of trying to be able to point a transaction back to the client.

Is anyone able to help with this? Thanks again in advance.

Answer 1

You need bi-directional association. This means that Client has a reference to Transactions and visa versa.

You already have the Client to Transactions covered. There is nothing in the implementation of List Of(T) that will provide a reference from the child elements to the parent (Or to the parent of the List to be more accurate).

You have provide the implementation yourself. One approach is:

Public Class Transaction
    Private ReadOnly _client as Client

    Sub New (client As Client)
        _client = client
    End Sub
End Class

Thereby enforcing the rule that each transaction should be associated to a client.

Usage would then be:

Dim cl as new Client()
cl.Transactions.Add(new Transaction(cl))