public Form1()
        {
            InitializeComponent();
            button_Read.Enabled = false;
            button_Start.Enabled = false;
            timer1.Enabled = true;
            timer1.Interval = 1000;
            timer1.Start();
        }

  private void timer1_Tick(object sender, EventArgs e)
        {
            string time = button_Read.Text;
            string[] arr = time.Split(‘:‘);
            if (arr.Length == 2)
            {
                int min, second;
                if (int.TryParse(arr[0], out min) && int.TryParse(arr[1], out second))
                {
                    second--;
                    if (second < 0)
                    {
                        second = 59;
                        min--;
                    }
                    button_Read.Text = min + ":" + second;
                    button_Start.Text = min + ":" + second;

                    if (min ==0 && second ==0 )
                    {
                        button_Read.Text = "读取ini.txt";
                        button_Start.Text = "开始测试";
                        button_Read.Enabled = true;
                        button_Start.Enabled = true;
                    }
                }
            }
        }