C# 中System.Timers.timer 如何通知UI线程

Question

string ss="";
private void Form1_Load(object sender, EventArgs e)
{
timer.Elapsed += new System.Timers.ElapsedEventHandler(timerControl);
timer.Interval = 5000;
timer.AutoReset = true;
timer.Enabled = true;
}

    private void timerControl(object sender, ElapsedEventArgs e)
    {
        if (ss.Length>5)
        {
            timer.Stop();
        }
        else
        {
                        //通知主线程去  添加执行ss+="a";
                        //这个timer线程 如何去通知主线程 
        }
    }

Answer 1

使用委托，参考
http://blog.163.com/zhb123@126/blog/static/62515850201062714121186/