c# 计时器 System.Timers.Timer

Question

第一次计时正确，从第二次计时开始明显快了很多，比如第一次计时2.25秒，第二次4.32秒，
第三次7.03秒，越来越快，这是怎么回事。代码如下：
private void button1_Click(object sender, EventArgs e)
{
if (button1.Text == "开始检查")
{
Thread t1 = new Thread(new ThreadStart(time1start));
t1.Start();
//time1.Start();
Thread t2 = new Thread(new ThreadStart(checkstart));
t2.Start();
}
else if (button1.Text == "重新检查")
{
t = 0;
//如何正在计时，则先停止再清零，否则直接清零
if (this.timer1.Enabled == true)
{
this.timer1.Enabled = false;
textBox1.Text = GetAllTime(t);
}
else
{
textBox1.Text = GetAllTime(t);
}
Thread t1 = new Thread(new ThreadStart(time1start));
t1.Start();
//time1.Start();
Thread t2 = new Thread(new ThreadStart(checkstart));
t2.Start();
button1.Text = "重新检查";
}
}
private void time1start()
{
//设置timer可用
timer1.Enabled = true;
//设置timer
timer1.Interval = 10;
//设置是否重复计时，如果该属性设为False,则只执行timer_Elapsed方法一次。
timer1.AutoReset = true;
timer1.Elapsed += new ElapsedEventHandler(timer_Elapsed);
}
private void checkstart()
{
conventionlabel3Click(null, null);
conventionlabel4Click(null, null);
conventionlabel5Click(null, null);
timer1.Enabled = false;
if (button1.Text == "开始检查")
{
button1.Text = "重新检查";
}

}

Answer 1

结贴了，原因是每点一次，timer1.Elapsed += new ElapsedEventHandler(timer_Elapsed);这行代码执行一次。