Get Constant of a class by knowing his type

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Hello. I got a tricky question that probably comes from a really horrible code, but I'll ask it anyway.

I have a father class and few classes that inherit from him. Each one of the classes should have a const "name" attribute (can't make it static because I need to use it in a "switch" statement and it doesn't allow me to use non-const) so I can't make an inheritable constant and must create a new one in all of the children classes. What should I do in that situation to fix my code to have an inheritable const?

Posted 20-Jul-14 5:07am

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[no name] 20-Jul-14 11:16am

Being that this makes no sense at all to me, why can't you use typeof to get the type of the class?

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OriginalGriff · Answer 1 · 2014-07-20T05:33:00

What are you talking about?

C#

    public void Demo()
        {
        MyDerived md = new MyDerived();
        int i = 9;
        switch (i)
            {
            case MyBase.AttributeOne:
                Console.WriteLine("ONE");
                break;
            case MyBase.AttributeTwo:
                Console.WriteLine("TWO");
                break;
            }
        }
    }

public abstract class MyBase
    {
    public const int AttributeOne = 1;
    public const int AttributeTwo = 2;
    }
public class MyDerived : MyBase
    {
    }

Works for me...

Sergey Alexandrovich Kryukov · Answer 2 · 2014-07-20T15:17:00

Using "switch" statement on something which plays the role of the type classifier ("Name", in your case) is a typical and a very bad violation of OOP. Also, it looks like you really need some read-only member, not exactly a formal constant.

To get an idea, consider, for example, this:

C#

abstract class Base {
    internal abstract string Name { get; } //read-only
}

class Derived : Base {
    internal override string Name { get { return "Some Name"; } } //read-only
}

class AnotherDerived : Base {
    internal override string Name { get { return "Some Other Name"; } } //read-only
}

//...

Base instance = new Derived();
string name = instance.Name; // will return "Some Name";

—SA

Get Constant of a class by knowing his type

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