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Retrieving a Constant from a polymorphic object

Posted on 2006-07-15
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Last Modified: 2010-04-16
Hi all,

I have a number of classes, each inheriting from an interface, and each with a matching const (i.e. the name of the const is the same, the value is different).

If I'm viewing an instance of one of these classes polymorphically via the interface, is there an easy way to access it's constant value? I could obviously add methods to each base class to return the const, but I wondered if there was any other, perhaps better, way of doing it?

Thanks
Gerry
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Question by:gamesmeister
2 Comments
 
LVL 48

Accepted Solution

by:
AlexFM earned 2000 total points
ID: 17113978
Looking at clsss instance via interface, you don't see this constant. I think the best way is to add property to the interface and implement it in every class:

    interface ISample
    {
        void Foo();

        int Constant
        {
            get;
        }
    }

    class Class1 : ISample
    {
        void ISample.Foo()
        {
        }

        int ISample.Constant
        {
            get
            {
                return myConstant;
            }
        }

        const int myConstant = 1;
    };

    class Class2 : ISample
    {
        void ISample.Foo()
        {
        }


        int ISample.Constant
        {
            get
            {
                return myConstant;
            }
        }

        const int myConstant = 2;
    };

Client code:

            ISample s1 = new Class1();
            Console.WriteLine(s1.Constant.ToString());

            ISample s2 = new Class2();
            Console.WriteLine(s2.Constant.ToString());
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LVL 4

Author Comment

by:gamesmeister
ID: 17114558
Yeah, I figured that would be the best way, just wondered if I'd missed something.

Off to update 30+ subclasses...

Thanks Alex
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