using System;

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public class Registry {

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    public void Register(string name, Action action) {

    }

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    public void Register<A>(string name, Action<A> action) {

​

    }

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    public void Register<A, B>(string name, Action<A, B> action) {

    }

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    public void Register<A, B, C>(string name, Action<A, B, C> action) {

    }

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}

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public class Program {

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    public class Foo {}

    public class Bar {}

    public class Baz {}

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    public static void DoAThing(Foo? a = default, Bar? b = default) {}

    public static void DoAnotherThing(Foo? a = default, Bar? b = default, Baz? b = default) {}

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    public static void Main(string[] args) {

        var registry = new Registry();

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        registry.Register("do-a-thing", DoAThing);

        registry.Register("do-another-thing", DoAnotherThing);

    }

}

​