c#中添加自定义事件的例子

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

namespace test
{
    /**//// <summary>
    /// 声明一个自定义的委托
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    public delegate void CharEeventHandler(object sender,CharEventArgs e);


    public class CharEventArgs:EventArgs
    {
        public char CurrChar;
        public CharEventArgs(char CurrChar)
        {
            this.CurrChar = CurrChar;
        }
    }

    public class CharChecker
    {
        char curr_char;
        public event CharEeventHandler CharTest;

        public char Curr_char
        {
            get { return curr_char; }
            set
            {
                if (CharTest != null)
                {
                    CharEventArgs myenen = new CharEventArgs(value);
                    curr_char = myenen.CurrChar;
                    this.CharTest(this, myenen);
                }
            }
        }
    }


    class Program
    {
        static void Main(string[] args)
        {
            CharChecker chartester = new CharChecker();
            chartester.CharTest += new CharEeventHandler(Change_X);
            chartester.Curr_char = 'a';
            Console.WriteLine("事件处理结果:{0}", chartester.Curr_char);
            chartester.Curr_char = 'b';
            Console.WriteLine("事件处理结果:{0}", chartester.Curr_char);
            chartester.Curr_char = 'x';
            Console.WriteLine("{0}", chartester.Curr_char);
            Console.WriteLine();
            Console.ReadLine();
        }


        static void Change_X(object source, CharEventArgs e)
        {
            if (e.CurrChar == 'x')
            {
                Console.Write("触发的字符是x,");
                Console.Write("把x替换成: ");
                e.CurrChar = '?';
            }
            else
            {
                Console.Write("触发的字符不是x,");
            }
        }
    }
}

运行结果为: