C#适配器模式

using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;

namespace ConsoleApp1
{
    // The Target defines the domain-specific interface used by the client code.
    public interface ITarget
    {
        string GetRequest();
    }

    // The Adaptee contains some useful behavior, but its interface is
    // incompatible with the existing client code. The Adaptee needs some
    // adaptation before the client code can use it.
    class Adaptee
    {
        public string GetSpecificRequest()
        {
            return "Specific request.";
        }
    }

    // The Adapter makes the Adaptee's interface compatible with the Target's
    // interface.
    class Adapter : ITarget
    {
        private readonly Adaptee _adaptee;

        public Adapter(Adaptee adaptee)
        {
            this._adaptee = adaptee;
        }

        public string GetRequest()
        {
            return $"This is '{this._adaptee.GetSpecificRequest()}'";
        }
    }


    public class ExistedOne
    {
        internal object GetSpecificRequest()
        {
            return "HaHa";
        }
    }

    class AdapterExisted : ITarget
    {
        private readonly ExistedOne _adaptee;

        public AdapterExisted(ExistedOne adaptee)
        {
            this._adaptee = adaptee;
        }

        public string GetRequest()
        {
            return $"This is '{this._adaptee.GetSpecificRequest()}'";
        }
    }


    class Program
    {
        static void Main(string[] args)
        {
            Adaptee adaptee = new Adaptee();
            ExistedOne existedOne = new ExistedOne();
            ITarget targetE = new AdapterExisted(existedOne);
            Console.WriteLine(targetE.GetRequest());

            ITarget target = new Adapter(adaptee);

            Console.WriteLine("Adaptee interface is incompatible with the client.");
            Console.WriteLine("But with adapter client can call it's method.");

            Console.WriteLine(target.GetRequest());
        }
    }
}