designPatternGuru/DesignPatternGuru/Mediator/Mediators/ConcreteMediator.cs

using Mediator.Components;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Mediator.Mediators
{
    internal class ConcreteMediator : IMediator
    {
        private Component1 _component1;
        private Component2 _component2;

        public ConcreteMediator(Component1 component1, Component2 component2)
        {
            _component1 = component1;
            _component2 = component2;

            _component1.SetMediator(this);
            _component2.SetMediator(this);
        }

        public void Notify(object sender, string ev)
        {
            if (ev == "A")
            {
                Console.WriteLine("Mediator reacts on A and triggers following operations: ");
                _component2.DoC();
            }

            if (ev == "D") 
            {
                Console.WriteLine("Mediator reacts on D and triggers following operations: ");
                _component1.DoB();
                _component2.DoC();
            }
        }
    }
}