推荐订阅源

代码中实现了三个自定义事件，分别为自定义事件、自定义事件及自定义参数、使用Action自定义事件。

using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace AppMain
{
    /// <summary>
    /// 入口
    /// </summary>
    public class RunEventDemo
    {
        #region 用Action定义事件测试
        public void RunProgramThree()
        {
            EventDemoThree edth = new EventDemoThree();
            edth.CustomerEvent += new Action<object, EventArgs>(edth_CustomerEvent);
            //触发事件
            edth.OnCustomerEvent();
        }

        void edth_CustomerEvent(object obj, EventArgs e)
        {
            Console.WriteLine("已调用Actiion执行的事件");
        }
        #endregion

        #region 使用自定义事件参数事件测试
        public void RunProgramTwo()
        {
            EventDemoTwo edt = new EventDemoTwo();
            edt.CustomerEvent += new EventDemoTwo.CustomerEventHander(edt_CustomerEvent);

            //创建事件参数
            CustomerEventArgs cea = new CustomerEventArgs();
            cea.CustomerMsg = " test";

            //触发事件
            edt.OnCustomerEvent(cea);
        }

        void edt_CustomerEvent(object sender, CustomerEventArgs e)
        {
            Console.WriteLine("你传入的参数值为：" + e.CustomerMsg);
        }

        #endregion

        #region 无参的自定义事件测试
        public void RunProgramOne()
        {
            //事件接收者
            EventDemoOne ed = new EventDemoOne();
            //4.注册事件处理程序
            ed.customerEvent += new EventDemoOne.CustomerEventHander(RunDemo_customerEvent);
            //6.调用事件
            ed.OnEvent();
        }
        //5.编写事件处理程序
        public void RunDemo_customerEvent(object sender, EventArgs e)
        {
            Console.WriteLine("test");
        }
        #endregion
    }

#region无参的自定义事件

    /// <summary>
    /// 无参的自定义事件
    /// </summary>
    public class EventDemoOne
    {
        //1.声明关于事件的委托；
        public delegate void CustomerEventHander(object sender, EventArgs e);
        //2.声明事件；   
        public event CustomerEventHander customerEvent;
        //3.编写引发事件的函数；
        public void OnEvent()
        {
            if (this.customerEvent != null)
            {
                this.customerEvent(this, new EventArgs());
            }
        }
    }
    #endregion

#region自定义事件，使用自定义事件参数
    /// <summary>
    /// 自定义事件参数
    /// </summary>
    public class CustomerEventArgs : EventArgs
    {
        public string CustomerMsg { get; set; }
    }

    public class EventDemoTwo
    {
        public delegate void CustomerEventHander(object sender, CustomerEventArgs e);
        public event CustomerEventHander CustomerEvent;
        //3.编写引发事件的函数，注意多了个参数；
        public void OnCustomerEvent(CustomerEventArgs e)
        {
            this.CustomerEvent(this, e);
        }
    }
    #endregion

#region使用Action自定义事件
    public class EventDemoThree
    {
        public event Action<object, EventArgs> CustomerEvent;
        public void OnCustomerEvent()
        {
            this.CustomerEvent(this, new EventArgs());
        }
    }
    #endregion

}