Question

how to implement a const field which in subClasses must be overwrite, i’m using .net 4, C#

because i have many classes they all have a const field(with different value) called ‘pName’.

so i want use a interface or abstract class or somthing as a parent and force these classes to override it.

it’s CONST field

Answer 1

You cannot override a const; nor can you declare it as static and override it there. What you can do is re-declare it, but that is not robust – in that which version gets used depends on which you ask for (entirely at compile-time – completely unrelated to polymorphism):

public new const int Foo = 12;

I would suggest you use a virtual or abstract property:

public virtual int Foo { get { return 4; } } // subclasses *can* override
public abstract int Foo { get; } // subclasses *must* override

and override:

public override int Foo { get { return 12; } }