委托和事件

1、委托

namespace ConsoleApp1
{
    class Program
    {
        public delegate void Del(string message);

        static void Main(string[] args)
        {
            Del hanld = new Del(DelegateMethod);
            MethodWithCallback(1, 2, hanld);
            Console.Read();
        }

        public static void DelegateMethod(string message)
        {
            Console.WriteLine(message);
        }

        public static void MethodWithCallback(int param1, int param2, Del callback)
        {
            callback(string.Format("当前的值为：{0}", (param1 + param2)));
        }

    }
}

结果：

 

 

2、事件

namespace ConsoleApp1
{
    public class PublishEvent
    {
        public delegate void NoticeHandler(string message);

        public event NoticeHandler NoticeEvent;

        public void Works()
        {
            //触发事件
            OnNoticed();
        }

        protected virtual void OnNoticed()
        {
            if (NoticeEvent != null)
            {
                //传递事件及参数
                NoticeEvent("Notice发布的报警信息！");
            }
        }
    }

    public class SubscribEvent
    {
        public SubscribEvent(PublishEvent pub)
        {
            //订阅事件
            pub.NoticeEvent += PrintResult;
        }

        /// <summary>
        /// 订阅事件后的响应函数
        /// </summary>
        /// <param name="message"></param>
        void PrintResult(string message)
        {
            Console.WriteLine(string.Format("已收到{0}！采取措施！", message));
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            PublishEvent publish = new PublishEvent();
            SubscribEvent subscrib = new SubscribEvent(publish);
            //触发事件
            publish.Works();
            Console.Read();
        }
    }

}

结果：

 

 

 

 

借鉴:https://blog.csdn.net/qq_41872328/article/details/121333505