C#计时器的三种实现方法

public partial class Timer2 : Form
    {
        //定义Timer类变量
        System.Timers.Timer Mytimer;
        long TimeCount;
        //定义委托
        public delegate void SetControlValue(long value);
 
        public Timer2()
        {
            InitializeComponent();
        }
 
        private void label1_Click(object sender, EventArgs e)
        {
 
        }
        //开始计时
        private void btnTimeStart_Click(object sender, EventArgs e)
        {
            Mytimer.Start();
            TimeCount = 0;
        }
        //停止计时
        private void btnTimeStop_Click(object sender, EventArgs e)
        {
            Mytimer.Stop();
        }
        private void Timer2_Load(object sender, EventArgs e)
        {
            //设置时间间隔ms
            int interval = 1000;  
            Mytimer = new System.Timers.Timer(interval);
            //设置重复计时
            Mytimer.AutoReset = true;
            //设置执行System.Timers.Timer.Elapsed事件
            
            Mytimer.Elapsed += new System.Timers.ElapsedEventHandler(Mytimer_tick);
        }
 
        private void Mytimer_tick(object sender, System.Timers.ElapsedEventArgs e)
        { 
            this.Invoke(new SetControlValue(ShowTime), TimeCount);
            TimeCount++;
        }
 
        private void ShowTime(long t)
        {
            TimeSpan temp = new TimeSpan(0,0,(int)t);
            txtTimeShow.Text = string.Format("{0:00}:{1:00}:{2:00}", temp.Hours, temp.Minutes,temp.Seconds);
        }
 
        private void txtTimeShow_TextChanged(object sender, EventArgs e)
        {
 
        }    
    }

和Timer控件相比，System.Timers.Timer.Elapsed事件相当于控件的Tick事件，只不过需要自己添加事件。