最简洁的泛型c#消息机制

using System;
using System.Collections;

public class EventSystem {
    public delegate void ListenerDelegate();
    public delegate void ListenerDelegate<T>(T t);
    public delegate void ListenerDelegate<T1, T2>(T1 t1, T2 t2);
    public delegate void ListenerDelegate<T1, T2, T3>(T1 t1, T2 t2, T3 t3);
    
    private Hashtable listeners = new Hashtable();

    #region Addlistener
    public void AddListener(string eventName, ListenerDelegate listener) {
        ListenerDelegate listenerDelegate = listeners[eventName] as ListenerDelegate;
        listenerDelegate = (ListenerDelegate)Delegate.Combine(listenerDelegate, listener);
        listeners[eventName] = listenerDelegate;
    }
    
    public void AddListener<T>(string eventName, ListenerDelegate<T> listener) {
        ListenerDelegate<T> listenerDelegate = listeners[eventName] as ListenerDelegate<T>;
        listenerDelegate = (ListenerDelegate<T>)Delegate.Combine(listenerDelegate, listener);
        listeners[eventName] = listenerDelegate;
    }
    
    public void AddListener<T1,T2>(string eventName, ListenerDelegate<T1,T2> listener) {
        ListenerDelegate<T1,T2> listenerDelegate = listeners[eventName] as ListenerDelegate<T1,T2>;
        listenerDelegate = (ListenerDelegate<T1,T2>)Delegate.Combine(listenerDelegate, listener);
        listeners[eventName] = listenerDelegate;
    }
    
    public void AddListener<T1,T2,T3>(string eventName, ListenerDelegate<T1,T2,T3> listener) {
        ListenerDelegate<T1,T2,T3> listenerDelegate = listeners[eventName] as ListenerDelegate<T1,T2,T3>;
        listenerDelegate = (ListenerDelegate<T1,T2,T3>)Delegate.Combine(listenerDelegate, listener);
        listeners[eventName] = listenerDelegate;
    }
    #endregion
    
    #region RemoveListener
    public void RemoveListener(string eventName, ListenerDelegate listener) {
        Delegate remove = Delegate.Remove(listeners[eventName] as ListenerDelegate, listener);
        SetRemoveValue(eventName, remove);
    }
    
    public void RemoveListener<T>(string eventName, ListenerDelegate<T> listener) {
        var remove = Delegate.Remove(listeners[eventName] as ListenerDelegate<T>, listener);
        SetRemoveValue(eventName, remove);
    }
    
    public void RemoveListener<T1, T2>(string eventName, ListenerDelegate<T1, T2> listener) {
        Delegate remove = Delegate.Remove(listeners[eventName] as ListenerDelegate<T1, T2>, listener);
        SetRemoveValue(eventName, remove);
    }
    
    public void RemoveListener<T1, T2, T3>(string eventName, ListenerDelegate<T1, T2, T3> listener) {
        Delegate remove = Delegate.Remove(listeners[eventName] as ListenerDelegate<T1, T2, T3>, listener);
        SetRemoveValue(eventName, remove);
    }

    private void SetRemoveValue(string eventName, Delegate remove) {
        if (remove == null) {
            listeners.Remove(eventName);
        } else {
            listeners[eventName] = remove;    
        }
    }
    #endregion
    
    public void RemoveAllListener(string eventName) {
        listeners.Remove(eventName);
    }
    
    public void Dispatch(string eventName)
    {
        if (listeners.ContainsKey(eventName)) {
            ListenerDelegate listenerDelegate = listeners[eventName] as ListenerDelegate;
            listenerDelegate();
        }
    }

    public void Dispatch<T>(string eventName, T t) {
        if (listeners.ContainsKey(eventName)) {
            ListenerDelegate<T> listenerDelegate = listeners[eventName] as ListenerDelegate<T>;
            listenerDelegate(t);    
        }
    }
    
    public void Dispatch<T1, T2>(string eventName, T1 t1, T2 t2) {
        if (listeners.ContainsKey(eventName)) {
            ListenerDelegate<T1,T2> listenerDelegate = listeners[eventName] as ListenerDelegate<T1,T2>;
            listenerDelegate(t1, t2);
        }
    }
    
    public void Dispatch<T1, T2, T3>(string eventName, T1 t1, T2 t2, T3 t3) {
        if (listeners.ContainsKey(eventName)) {
            ListenerDelegate<T1,T2,T3> listenerDelegate = listeners[eventName] as ListenerDelegate<T1,T2,T3>;
            listenerDelegate(t1, t2, t3);
        }
    }
}

最多支持3个参数，再多我认为要写结构体了

Delegate.Combine和+= 是有区别的   https://www.coder.work/article/1627775