DaSaSo/DaSaSo.ViewModel/Mediator.cs

using DaSaSo.ViewModel.Enums;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DaSaSo.ViewModel
{
    class Mediator
    {
        private static IDictionary<EMediator, List<Action<object>>> pl_dict = new Dictionary<EMediator, List<Action<object>>>();
        public static void Subscribe(EMediator token, Action<object> callback)
        {
            if (!pl_dict.ContainsKey(token))
            {
                var list = new List<Action<object>>();
                list.Add(callback);
                pl_dict.Add(token, list);
            }
            else
            {
                bool found = false;
                foreach (var item in pl_dict[token])
                {
                    if (item.Method.ToString() == callback.Method.ToString())
                        found = true;
                }
                if (!found)
                    pl_dict[token].Add(callback);
            }
        }
        public static void Unsubscribe(EMediator token, Action<object> callback)
        {
            if (pl_dict.ContainsKey(token))
                pl_dict[token].Remove(callback);
        }

        public static void Notify(EMediator token, object? args = null)
        {
            if (pl_dict.ContainsKey(token))
            {
                foreach (var callback in pl_dict[token])
                    callback(args);
            }
        }
    }
}