using System;

​

​

using static MagicHappensHere;

public class Program

{

    public static void Main()

    {

        CanEquip(new Titan(), new ArtifactSlot(), new Artifact());

        CanEquip(new Warlock(), new ArtifactSlot(), new Artifact());

        CanEquip(new Warlock(), new ArtifactSlot(), new Spellbook());

        CanEquip(new Warlock(), new WeaponSlot(), new Staff());

        CanEquip(new Titan(), new ArtifactSlot(), new Spellbook());

        CanEquip(new Titan(), new WeaponSlot(), new Staff());

    }

}

​

public class Hero {}

public class Warlock : Hero {}

public class Titan : Hero {}

​

public class Slot {}

public class WeaponSlot : Slot {}

public class ArtifactSlot : Slot {}

​

public class Item {}

public class Weapon : Item {}

public class Sword : Weapon {}

public class Staff : Weapon {}

public class Artifact : Item {}

public class Spellbook : Artifact {}

​

public static class MagicHappensHere

{

    public static void CanEquip(Hero hero, Slot slot, Item item)

    {

        var result = Equippable(hero as dynamic, slot as dynamic, item as dynamic);

        var action = result ? "can" : "can't";

        Console.WriteLine($"{hero.GetType().Name} {action} equip {item.GetType().Name} in {slot.GetType().Name}");

    }

    // по дефолту никто ничего не может

    public static bool Equippable(Hero hero, Slot slot, Item item) => false;

    // все могут использовать артефакты

    public static bool Equippable(Hero hero, ArtifactSlot slot, Artifact item) => true;

    // кроме варлока

    public static bool Equippable(Warlock hero, ArtifactSlot slot, Artifact item) => false;

    // варлок может использовать книги заклинаний

    public static bool Equippable(Warlock hero, ArtifactSlot slot, Spellbook item) => true;

    // и посохи

    public static bool Equippable(Warlock hero, WeaponSlot slot, Staff item) => true;

    // а остальные не могут

    public static bool Equippable(Hero hero, ArtifactSlot slot, Spellbook item) => false;

    public static bool Equippable(Hero hero, WeaponSlot slot, Staff item) => false;

}