{C#}流畅方法.门面

背景

• 可以参考门面设计模式的思路，设计流畅方法

示例

using static System.Console;

namespace FluentFacade
{
    // 数据类
    public class Car
    {
        public string Type { get; set; }
        public string Color { get; set; }
        public int NumberOfDoors { get; set; }
        public string City { get; set; }
        public string Address { get; set; }

        public override string ToString()
            => $"Type: {Type}, Color: {Color}, NumberOfDoors: {NumberOfDoors}, City: {City}, Address: {Address}";
    }

    public class Facade
    {
        protected Car Car = new Car();

        public Facade() { }

        public Car Build() => Car;
        public InfoBuilder Info => new InfoBuilder(Car);
        public AddressBuilder Address => new AddressBuilder(Car);
    }

    // 继承门面类引入其内容，下同
    public class InfoBuilder : Facade
    {
        public InfoBuilder(Car car)
        {
            Car = car;
        }

        // 返回容器类，下同
        public InfoBuilder TypeIs(string type)
        {
            Car.Type = type;
            return this;
        }
        public InfoBuilder ColorIs(string color)
        {
            Car.Color = color;
            return this;
        }

        public InfoBuilder NumberOfDoorsIs(int number)
        {
            Car.NumberOfDoors = number;
            return this;
        }
    }

    public class AddressBuilder : Facade
    {
        public AddressBuilder(Car car)
        {
            Car = car;
        }

        public AddressBuilder CityIs(string city)
        {
            Car.City = city;
            return this;
        }

        public AddressBuilder AddressIs(string address)
        {
            Car.Address = address;
            return this;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var car = new Facade()
                .Info
                    .TypeIs("BWM")
                    .ColorIs("Red")
                    .NumberOfDoorsIs(5)
                .Address
                    .CityIs("Shanghai")
                    .AddressIs("Yangpu Rd.JY 55")
                .Build();

            WriteLine(car);
            ReadKey();
        }
    }
}