private void FormClosed(object sender, FormClosedEventArgs e)
        {
            mainView.Dispose();
            mainView = null;
            Utils.ReleaseMemory(true);

            System.Environment.Exit(0);
        }
        public void Start()
        {
            if (mainView == null)
            {
                // 虽然是单例,但是只能在Controller层使用
                exchangeManager            = ExchangeManager.GetInstance();
                exchangeManager.Controller = this;

                mainView             = new View.exchanger(this);
                mainView.FormClosed += FormClosed;

                mainView.Show();
            }
            mainView.Activate();
        }