System.Timers.Timer t;int sum = 0;int qian;int bai;int shi;int ge;public 测试定时启动(){InitializeComponent();}//1.使用System.Timers.Timer//2.threadThread th;//定义线程private void 测试定时启动_Load(object sender, EventArgs e){textBox1.Text = "00.00";t = new System.Timers.Timer(1000);t.Elapsed += new System.Timers.ElapsedEventHandler(theout);//到达时间的时候执行事件；t.AutoReset = true;//设置是执行一次（false）还是一直执行(true)；
th = new Thread(calculate);//2.线程方法th.IsBackground = true;}private void theout(object sender, EventArgs e){sum++;qian = sum / 1000;bai = sum % 1000 / 100;shi = sum % 100 / 10;ge = sum % 10;textBox1.Text = qian.ToString() + bai.ToString() + "." + shi.ToString() + ge.ToString();lbmessge.Items.Insert(0, "我1111");}private void button1_Click(object sender, EventArgs e){t.Enabled = true;//是否执行System.Timers.Timer.Elapsed事件；//如果不写下面这句会有一个异常。//异常：线程间操作无效: 从不是创建控件"richtextbox"的线程访问它//但这不是最好的方法。如果只有一个进程调用richtextbox而已。就可以用下面这句//如果有多个线程调用richtextbox等控件。就要用委托。见thread第二种方法
Control.CheckForIllegalCrossThreadCalls = false;}private void calculate()//线程的第一种方法
        {while (true){sum++;qian = sum / 1000;bai = sum % 1000 / 100;shi = sum % 100 / 10;ge = sum % 10;textBox1.Text = qian.ToString() + bai.ToString() + "." + shi.ToString() + ge.ToString();Thread.Sleep(1000);}}

 public partial class 测试定时启动 : Form{System.Timers.Timer t;int sum = 0;int qian;int bai;int shi;int ge;public 测试定时启动(){InitializeComponent();}//1.使用System.Timers.Timer//2.threadThread th;//定义线程private void 测试定时启动_Load(object sender, EventArgs e){textBox1.Text = "00.00";th = new Thread(calculate);th.IsBackground = true;}private void calculate()//线程的第一种方法
        {while (true){sum++;qian = sum / 1000;bai = sum % 1000 / 100;shi = sum % 100 / 10;ge = sum % 10;textBox1.Text = qian.ToString() + bai.ToString() + "." + shi.ToString() + ge.ToString();Thread.Sleep(1000);}}private void button1_Click(object sender, EventArgs e){th.Start();Control.CheckForIllegalCrossThreadCalls = false; // 同2，不写会报错
            }}