Re: Child objects inheriting property values

Using inheritance is semantically wrong since a Column 'IS A' record is not
correct. Moreover, assigning field values of a base class to its subclass in
a constructor feels awkward. A good compiler should disallow it.
Again, the class order in your question appears reversed to me (I expect a
column collection to exist before a record does) but I'll just answer your
question narrowly. Here's my solution to that problem.
=======================================

class Column{

    private char delimiter;
    public Column(){
        // first, set parent record;
        // then ...
        this.delimiter = ParentRecord.Delimiter;
    }
    public Record ParentRecord { get; set; }
    public char Delimiter { get; set; }
}

class Record{
    private char delimiter = '^';
    public Record(){

    }
    private Column[] columns;
    public char Delimiter {get; set;}

}

--------------------------------------------------
From: "Adrian Martin" <[email protected]>
Sent: Tuesday, November 20, 2007 6:28 AM
To: <[email protected]>
Subject: Re: [DOTNET-CLR] Child objects inheriting property values

>        class Column : Record
>        {
>                public Column()
>                {
>                        this.Delimeter = base.Delimeter;
>                }
>        }
>
>
>
>
>
>
>
> -----Original Message-----
> From: Discussion of development on the .NET platform using any managed
> language [mailto:[email protected]] On Behalf Of Brady
> Kelly
> Sent: 20-November-2007 10:10
> To: [email protected]
> Subject: Child objects inheriting property values
>
> I have a hierarchy of objects that share some attributes, e.g. both my
> parent Record and Column objects have a columnDelimiter property.  I
> want
> this property on the Column object to default to the same property on
> the
> Record object, until specified on the Column object.  What is the best
> way
> to go about this?  I could give each Column a reference to the Record it
> belongs to, but this seems not quite right to me.  My other option is to
> have the Record act as a ColumnFactory, setting the columnDelimiter
> value on
> each Column it creates, until a set accessor on Column optionally
> overrides
> that default value.
>
>
> ===================================
> This list is hosted by DevelopMentor(r)  http://www.develop.com
>
> View archives and manage your subscription(s) at
> http://discuss.develop.com
>
>
> Johnston Press plc      Registered in Scotland no. SC015382
> Registered Office: 53 Manor Place, Edinburgh, EH3 7EG
>
> Opinions expressed in this email are those of the writer and not the
> company.  E-mail traffic is monitored within Johnston Press and messages
> may be viewed.  This e-mail and any files with it are solely for the use
> of the addressee(s).  If you are not the intended recipient, you have
> received this e-mail in error.  Please delete it or return it to the
> sender or notify us by email at [email protected]
>
> ===================================
> This list is hosted by DevelopMentor®  http://www.develop.com
>
> View archives and manage your subscription(s) at
> http://discuss.develop.com
>

===================================
This list is hosted by DevelopMentor®  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com