private static void Application_Idle(object sender, EventArgs e)
 {
     Application.Idle -= new EventHandler(Application_Idle);
     if (applicationContext.MainForm == null)
     {
         MESMainForm mainForm = new MESMainForm();
         applicationContext.MainForm = mainForm;
         //初始化
         mainForm.InitMain();
         WelcomeForm welcomeForm = applicationContext.Tag as WelcomeForm;
         mainForm.Show();
         welcomeForm.Close();
     }
 }