Specifying the return type of an abstract method from a Base Class according to a Sub Class

Question

I have the following structure:

abstract class Base {
        public abstract List<...> Get(); //What should be the generic type?
}

class SubOne :         


        

Answer 1

Your abstract class should be generic.

abstract class Base {
        public abstract List Get(); 
}

class SubOne : Base {
    public override List Get() {

    }
}

class SubTwo : Base {
    public override List Get() {
    }
}

If you need to refer to the abstract class without the generic type argument, use an interface:

interface IBase {
        //common functions
}

abstract class Base : IBase {
        public abstract List Get(); 
}