简单的事件中心

下面给出一个简单的事件中心的实现

首先是事件类型

/// <summary>
/// 事件类型
/// </summary>
public enum EventType
{
    Speed,Frozen,Pause,UnPause,Dash,GameOver
}

然后是事件中心

using System;
using System.Collections.Generic;

/// <summary>
/// 事件中心，负责注册、发布事件
/// </summary>
public class EventCenter
{

    private static EventCenter _instance = null;
    public static EventCenter Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = new EventCenter();
            }

            return _instance;
        }
    }

    private Dictionary<EventType, List<Action>> eventDict = new Dictionary<EventType, List<Action>>();

    private EventCenter() { }//私有构造函数，防止外部实例化

    /// <summary>
    /// 订阅事件
    /// </summary>
    /// <param name="eventType">事件类型</param>
    /// <param name="eventHandler">事件处理方法</param>
    public void SubscribeEvent(EventType eventType, Action eventHandler)
    {
        if (eventDict.ContainsKey(eventType))
        {
            eventDict[eventType].Add(eventHandler);
        }
        else
        {
            List<Action> list = new List<Action>();
            list.Add(eventHandler);
            eventDict.Add(eventType, list);
        }
    }

    /// <summary>
    /// 取消订阅事件
    /// </summary>
    /// <param name="eventType">事件类型</param>
    /// <param name="eventHandler">事件处理方法</param>
    public void RemoveSubscribedEvent(EventType eventType, Action eventHandler)
    {
        if(eventDict.ContainsKey(eventType))
        {
            eventDict[eventType].Remove(eventHandler);
        }
    }

    /// <summary>
    /// 发布事件
    /// </summary>
    /// <param name="eventType">事件类型</param>
    public void PublishEvent(EventType eventType)
    {
        if (eventDict.ContainsKey(eventType))
        {
            foreach (Action handler in eventDict[eventType])
            {
                handler?.Invoke();
            }
        }
    }
}

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