C# 實現自訂事件

代碼中實現了三個自訂事件，分別為自訂事件、自訂事件及自訂參數、使用Action自訂事件。

 

using System;

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

namespace AppMain
{
    /// <summary>
    /// 入口
    /// </summary>
    public class RunEventDemo
    {
        #region 用Action定義事件測試
        public void RunProgramThree()
        {
            EventDemoThree edth = new EventDemoThree();
            edth.CustomerEvent += new Action<object, EventArgs>(edth_CustomerEvent);
            //觸發事件
            edth.OnCustomerEvent();
        }

        void edth_CustomerEvent(object obj, EventArgs e)
        {
            Console.WriteLine("已調用Actiion執行的事件");
        }
        #endregion

        #region 使用自訂事件參數事件測試
        public void RunProgramTwo()
        {
            EventDemoTwo edt = new EventDemoTwo();
            edt.CustomerEvent += new EventDemoTwo.CustomerEventHander(edt_CustomerEvent);

            //建立事件參數
            CustomerEventArgs cea = new CustomerEventArgs();
            cea.CustomerMsg = " test";

            //觸發事件
            edt.OnCustomerEvent(cea);
        }

        void edt_CustomerEvent(object sender, CustomerEventArgs e)
        {
            Console.WriteLine("你傳入的參數值為：" + e.CustomerMsg);
        }

        #endregion

        #region 無參的自訂事件測試
        public void RunProgramOne()
        {
            //事件接收者
            EventDemoOne ed = new EventDemoOne();
            //4.註冊事件處理常式
            ed.customerEvent += new EventDemoOne.CustomerEventHander(RunDemo_customerEvent);
            //6.呼叫事件
            ed.OnEvent();
        }
        //5.編寫事件處理常式
        public void RunDemo_customerEvent(object sender, EventArgs e)
        {
            Console.WriteLine("test");
        }
        #endregion
    }

     

 

#region無參的自訂事件

    /// <summary>
    /// 無參的自訂事件
    /// </summary>
    public class EventDemoOne
    {
        //1.聲明關於事件的委託；
        public delegate void CustomerEventHander(object sender, EventArgs e);
        //2.聲明事件；   
        public event CustomerEventHander customerEvent;
        //3.編寫引發事件的函數；
        public void OnEvent()
        {
            if (this.customerEvent != null)
            {
                this.customerEvent(this, new EventArgs());
            }
        }
    }
    #endregion

     

#region自訂事件，使用自訂事件參數
    /// <summary>
    /// 自訂事件參數
    /// </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.編寫引發事件的函數，注意多了個參數；
        public void OnCustomerEvent(CustomerEventArgs e)
        {
            this.CustomerEvent(this, e);
        }
    }
    #endregion

     

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

}