CODEWITHSUNDEEP
vb.netoopinterface
EriqaBana
EriqaBana

Reputation: 125

Newbie to Interface and oop concepts

I understand the concept of an interface in oop but implementing it is challenging for me. These are my classes:

Public Class Alpha 
   Public Property Id As Integer
   Public Property StartDate as Date
   Public Property System as string
   Public Sub Deserialize(ByVal row As DataRow)
       Me.Id = row("Id ") ...
   end sub
end class

Public Class Bravo
   Public Property Id As Integer
   Public Property StartDate as Date
   Public Property Dosage as integer
   Public Sub Deserialize(ByVal row As DataRow)
       Me.Id = row("Id ") ...
   end sub
end class

Public Class Parent
   Public Property Id As Integer
   Public Property Name as String
   Public Property AdmitDate as Date  
   Public Sub Deserialize(ByVal row As DataRow)
       Me.Id = row("Id ") ...
   end sub     
end class

Public Class AlphaList inherits List(of Alpha)
    Public Sub Deserialize(table As DataTable)
     For Each objRow As DataRow In table.Rows
        Dim obj As New Bravo            
        obj.Deserialize(objRow)            
        Me.Add(obj)
     Next
    end sub    
end Class

Public Class BravoList inherits List(of Bravo)
    Public Sub Deserialize(table As DataTable)
     For Each objRow As DataRow In table.Rows
        Dim obj As New Bravo            
        obj.Deserialize(objRow)            
        Me.Add(obj)
     Next
    end sub
end Class

Public Class ParentList inherits List(of Parent)
    Public Sub Deserialize(table As DataTable)
     For Each objRow As DataRow In table.Rows
        Dim obj As New Parent
        obj.Deserialize(objRow)            
        Me.Add(obj)
     Next
    end sub
end Class

Currently, I have the following two functions in Class Parent

public Sub RunA(aList as AlphaList )
    For each item as Alpha in alist
       item.Id ....
    next
end sub
public Sub RunB(bList as BravoList )
    For each item as Bravo in bList 
       item.Id ....
    next
end sub

Basically, they have the same implementation, the only thing different is the argument - either a AlphaList or BravoList.

I want to create a function in Class Parent that takes any AlhpaList or BravoList. How would I do this? Thanks in advance!! .. I would like to extract it out all together and do some thing like (pseudocode) :

public sub Run ( anyList List of Alpha or Bravo, any list of List of Parent)

Upvotes: 0

Views: 43

Answers (1)

jmcilhinney
jmcilhinney

Reputation: 54417

What you're asking for is not really possible. Alpha and Bravo are different types and so their StartDate properties are different properties. the fact that they have the same name doesn't change that. You could use late-binding but that would be a filthy hack.

Even if you define an interface with a StartDate property and have Alpha and Bravo implement that, it still wouldn't allow you to pass a List(Of Alpha) or a List(Of Bravo) to a parameter that expects a List(Of ISomeInterface).

If you were to have such an interface though, you could at least write a method that had a parameter of that type and then call it within your loops in the methods with the List(Of Alpha) and List(Of Bravo) parameters.

Upvotes: 1

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