How to apply a different attribute to an interface's member than that of the same member in a parent interface

Question

Imagine an interface heirarchy like this:

public interface IAnimal
{
    string Color { get; }
}


public interface ICat : IAnimal
{
}

In this case, ICat 'inherits' IAnimal's Color property.

Is it possible to add an attribute to the ICat's Color property, without adding it to the IAnimal?

The following is an example of what I am trying to achieve, but gives a compiler warning:

public interface IAnimal
{
    string Color { get; }
}


public interface ICat : IAnimal
{
    [MyProperty]
    string Color { get; }
}

Answer 1

This compiles for me in C# 4.0 beta 2. It does give a warning that the 'new' keyword might be warranted.

Also for the curious, this struck me as interesting: http://blogs.msdn.com/ericlippert/archive/2009/09/14/what-s-the-difference-between-a-partial-method-and-a-partial-class.aspx

Answer 2

I assume the warning you are getting is

warning CS0108: 'ICat.Color' hides inherited member 'IAnimal.Color'. Use the new keyword if hiding was intended.

What are you trying to accomplish by applying that attribute?
If you want to avoid that warning you might do something like the following:

public class MyPropertyAttribute : Attribute { }

public interface IAnimal {
    string Color { get; }
}

public abstract class Cat : IAnimal {
    [MyProperty]
    public string Color {
        get { return CatColor; }
    }
    protected abstract string CatColor {
        get;
    }
}