C# 通過System.Timers.Timer獲取時間

public delegate void timeDelegate();// Timer獲取時間

private void Form1_Load(object sender, EventArgs e)
{
    System.Timers.Timer t = new System.Timers.Timer(1000); //設置時間間隔為5秒
    t.Elapsed += new System.Timers.ElapsedEventHandler(Timer_TimesUp);
    t.Enabled = true; //是否觸發Elapsed事件
    t.AutoReset = true; //每到指定時間Elapsed事件是觸發一次（false），還是一直觸發（true）
}
private void Timer_TimesUp(object sender, System.Timers.ElapsedEventArgs e)
{
    timeDelegate td = new timeDelegate(timeChange);
    this.BeginInvoke(td);
}
public void timeChange()
{
    int hour = System.DateTime.Now.Hour;
    int minute = System.DateTime.Now.Minute;
    int second = System.DateTime.Now.Second;
    textBox1.Text = hour.ToString();
    textBox2.Text = minute.ToString();
    textBox3.Text = second.ToString();
}