How to force the derived class to override a method that returns its class name only?

user_397524 0
Viewed 36

I don't know what pattern I have to implement for forcing the derived class to override the method Print returning only its class name.

class Base
{
    protected virtual string Print() => nameof(Base);

    static void Main(string[] args)
    {
        Base b = new Derived();
        Console.WriteLine(b.Print());
    }
}

class Derived : Base
{
    protected override string Print() => nameof(Derived);
}
design-patterns c#
2 Answers

You can enforce what you need by implementing generic logic in the base class:

protected string Print() => this.GetType().Name;

That way, if you call the method from Base, you will always get derived class name.

user_1868220

You could use some generics and type constraint on the base class. Not sure what you are trying to accomplish.

    private static void Main(string[] args)
    {
        var instance = new Derived();
        Console.WriteLine(instance.Print());
        Console.ReadLine();
    }

    public abstract class Base<TChild>
        where TChild : Base<TChild>
    {
        public string Print() => typeof(TChild).Name;
    }

    public class Derived : Base<Derived>
    {
    }
user_4907440
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