Timer 函数 C#

private static void Timekeeping(int expire)
        {
            System.Timers.Timer timer = new System.Timers.Timer();
            timer.Interval = expire;
            timer.Enabled = true;
            timer.AutoReset = false;
            timer.Elapsed += new System.Timers.ElapsedEventHandler(OnTimedEvent);
            timer.Start();
        }
        private static void OnTimedEvent(object source, ElapsedEventArgs e)
        {
            if (Login() == false)
            {
                Process.GetCurrentProcess().CloseMainWindow();
                Process.GetCurrentProcess().Kill();
                Log.WriteLog("登录", "程序加载", "登录API失败，获取token失败，关闭程序");
            }

        }

//如果将 System.Timers.Timer timer = new System.Timers.Timer();设置为全局变量的话，会出现循环执行，但是没有间隔时间