C# Fluentインターフェース

 オブジェクト自身を返すメソッドを定義して、Fluentインターフェースを作りました。

メソッドチェーンでピザのサイズやトッピングを設定できます。

using System;
using System.Collections.Generic;

public class Pizza
{
    public string Size { get; private set; }
    public List Toppings { get; private set; }
    public string CheeseAmount { get; private set; }




    public Pizza()
    {
        Toppings = new List();
    }

    public Pizza Small()
    {
        Size = "Small";
        return this;
    }

    public Pizza Medium()
    {
        Size = "Medium";
        return this;
    }

    public Pizza Large()
    {
        Size = "Large";
        return this;
    }

    public Pizza AddTopping(string topping)
    {
        Toppings.Add(topping);
        return this;
    }

    public Pizza ExtraCheese()
    {
        CheeseAmount = "Extra";
        return this;
    }

    public Pizza NormalCheese()
    {
        CheeseAmount = "Normal";
        return this;
    }

    public override string ToString()
    {
        return $"Size: {Size}, Cheese: {CheeseAmount}, Toppings: {string.Join(", ", Toppings)}";
    }
}



public class Program
{
    public static void Main(string[] args)
    {
        Pizza myPizza = new Pizza()
            .Medium()
            .AddTopping("Tomato")
            .AddTopping("Onion")
            .ExtraCheese();

        Console.WriteLine(myPizza);
    }
}

Size: Medium, Cheese: Extra, Toppings: Tomato, Onion