Question

I am wondering whether there is any feature like method inheritance rather than whole class inheritance, let me elaborate what I am trying to explain :

class a {
   public void GetA(){
     // some logic here
}
}

class b {
    public void GetB() : new Class().GetA()
}

I know it looks weird but I was reading how to do delegation in object composition pattern and I thought this pattern for some reason.

Answer 1

If you just want to call GetA() inside of GetB(), but don’t want to define or explicitly reference an instance of class a in GetB(), you can pass GetA() in as a delegate.

In C#, there are many predefined delegates such as Action and Func. Or, you could always roll your own delegate to match the method signature.

    class a
    {
        public void GetA()
        {
            Console.WriteLine("Hello World!");
        }
    }

    class b
    {
        // No explicit reference to class a of any kind.
        public void GetB(Action action)
        {
            action();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var a = new a();
            var b = new b();

            b.GetB(a.GetA);
        }
    }