{C#}设计模式辨析.中介者

背景

• 成员间通过中介者传话

示例

using static System.Console;

namespace DesignPattern_Mediator
{
    using static System.Console;

namespace DesignPattern_Mediator
{
    // 成员接口
    public interface IMemeber
    {
        void Send(IMemeber to, string message);
        void Recieve(IMemeber fm, string message);
    }

    // 成员类
    public class Member : IMemeber
    {
        private readonly string name;
        private readonly ChatRoom room;

        public Member(string name, ChatRoom room)
        {
            this.name = name;
            this.room = room;
        }

        // 通过中介联络
        public void Send(IMemeber to, string message)
            => room.Send(this, to, message);

        public void Recieve(IMemeber fm, string message)
            => WriteLine($"{fm} to {this}: {message}");

        public override string ToString() => name;
    }

    // 中介者接口
    public interface IChatRomm
    {
        void Send(IMemeber fm, IMemeber to, string message);
    }

    // 中介者类
    public class ChatRoom : IChatRomm
    {
        public ChatRoom() { }

        public void Send(IMemeber fm, IMemeber to, string message)
        {
            to.Recieve(fm, message);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var room = new ChatRoom();
            var zhang = new Member("Zhang", room);
            var li = new Member("Li", room);

            zhang.Send(li, "Hello");
            li.Send(zhang, "Hi");

            ReadKey();
        }
    }
}