MyBase.New Query

[Skittle]

I am working through a VB.Net book ( as you do ) and I have come across a bit of code that seems a bit redundant to me.
the book gives no explanation why it is there.

A child class inherits a parent class and in the child class with the following code:-

Public Class LineItemList
   Inherits list(Of lineItem)

   Public Sub New()
        MyBase.New
   End Sub

   Default Public Overloads readOnly Property item(ByVal I As Integer) As Line Item
    . . .
    . . .
   End Propery

   etc.

The New constructor is defined here to be exactly the same as the parent constructor
but if they are the same, why is there a need to code it at all in the child class?
The Public Sub New() definition in this class seems unnecessary to me.
Am I missing something?


Dazed and confused.

Remember.. 'Depression is just anger without enthusiasum'.

 

[MajP]

it is not necessary, it will be called automatically

If the base class has a constructor with no parameters that is accessible to derived classes, MyBase.New can be called automatically. If not, a base class constructor must be called with parameters, and this cannot be done automatically. In this case, the first statement of every derived class constructor must call a parameterized constructor on the base class, or call another constructor in the derived class that makes a base class constructor call

 

[Skittle]

Thought so. Thanks.


Dazed and confused.

Remember.. 'Depression is just anger without enthusiasum'.