EventHandler和Timer添加事件操作

来源：互联网发布：mysql 修复数据库编辑：程序博客网时间：2024/05/01 21:53

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace Go{    public partial class Form1 : Form    {        public Form1()        {            checkEH += OnPlus;            checkEH += OnOp;            InitializeComponent();            Initial();        }        public delegate void checkEnventHandler(object sender, checkEventArgs e);        public event checkEnventHandler checkEH;        public class checkEventArgs : EventArgs        {            public string str = "Hello World!";            public checkEventArgs(string str)            {                this.str = str;            }            //MessageBox.Show(str);            ~checkEventArgs()            {}        }        public void OncheckEH(checkEventArgs e)        {            checkEH(this, e);        }        public int a = 0;        public int b = 0;        public string strOp = "String OpVeal";        public void OnOp(object sender, checkEventArgs e)        {            b = 0;            b++;            strOp = "/////*****";        }        public void OnPlus(object sender, checkEventArgs e)        {            a = 9;        }        private void btn_Click(object sender, EventArgs e)        {                        checkEventArgs msg = new checkEventArgs("HOO");            OncheckEH(msg);             txt.Text += strOp;            txt.Text += "*******";            txt.Text += a.ToString();            txt.Text += "*******";            txt.Text += b.ToString();            timer2.Enabled = true;        }        public System.Timers.Timer timer1 = new System.Timers.Timer();        public System.Timers.Timer timer2 = new System.Timers.Timer();        public List<System.Timers.Timer> lsttimer = new List<System.Timers.Timer>();        public void Get1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)        {            a++;            if (a>46)            {                timer1.Enabled = false;                timer2.Enabled = true;            }        }        public void Get2_Elapsed(object sender, System.Timers.ElapsedEventArgs e)        {            b++;            MessageBox.Show("Waiting...");            if (b > 10)            {                timer2.Enabled = false;            }        }        public void Initial()        {            timer1 = new System.Timers.Timer(5000);            timer1.Elapsed += new System.Timers.ElapsedEventHandler(Get1_Elapsed);            lsttimer.Add(timer1);            timer2 = new System.Timers.Timer(1000);            timer2.Elapsed += new System.Timers.ElapsedEventHandler(Get2_Elapsed);            lsttimer.Add(timer2);        }    }}

在EventHandler中添加事件时，不能重复执行添加事件函数（Initial），否则导致EventHandler中多次添加该事件，会重复执行。

Timer计时器中添加事件，如果不将计时器的使能置为false，则会一直执行下去。