/*

 External Factory Method

 - external class used to create different types of concrete Item objects

*/

​

using System;

using System.Threading.Tasks;

​

public class Program {

    public static async Task Main() {       

        var bottleOpener = await ItemFactory.CreateBottleOpener();  

        Console.WriteLine(bottleOpener);

        var moneyClip = await ItemFactory.CreateMoneyClip();

        Console.WriteLine(moneyClip);

    }

}

​

public class ItemFactory {

    public static async Task<Item> CreateBottleOpener() {

        return await Task.Run(() => new Item("Bottle Opener"));

    }

​

    public static async Task<Item> CreateMoneyClip() {

        return await Task.Run(() => new Item("Money Clip"));

    }

}

​

public class Item {

    public string Name {get; }

    internal Item(string name) {

        this.Name = name;

    }

    public override String ToString() {

        return $"({Name})";

    }

}