C# .NET Publisher-Subscriber-Pattern example

C# Publisher-Subscriber-Pattern.cs

// SOURCE:
// https://www.codeproject.com/articles/866547/publisher-subscriber-pattern-with-event-delegate-a

using System;

namespace DotNetTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var pub = new Publisher();
            var sub1 = new Subscriber(pub);
            var sub2 = new Subscriber(pub);

            sub1.Publisher.Handler += delegate (object sender, Message msg)
            {
                Console.WriteLine($"Sub1: {msg.Content}");
            };

            sub2.Publisher.Handler += delegate (object sender, Message msg)
            {
                Console.WriteLine($"Sub2: {msg.Content}");
            };

            pub.Publish("hey");

            Console.ReadKey();
        }
    }


    class Message
    {
        public string Content { get; set; }
        public Message(string _content)
        {
            Content = _content;
        }
    }

    interface IPublisher
    {
        event EventHandler<Message> Handler;
        void Publish(string cont);
    }

    class Publisher : IPublisher
    {
        public event EventHandler<Message> Handler;

        public void OnPublish(Message msg)
        {
            Handler?.Invoke(this, msg);
        }

        public void Publish(string cont)
        {
            Message msg = (Message)Activator.CreateInstance(typeof(Message), cont);
            OnPublish(msg);
        }
    }

    class Subscriber
    {
        public IPublisher Publisher { get; set; }
        public Subscriber(IPublisher publisher)
        {
            Publisher = publisher;
        }
    }
}