WPF 先显示登录成功，验证成功后显示主窗口

    public partial class LoginWindow : Window
    {
        public LoginWindow()
        {
            InitializeComponent();
        }

        private void btnClose_Click(object sender, RoutedEventArgs e)
        {
            System.Windows.Application.Current.Shutdown();
        }

        private void btnLogin_Click(object sender, RoutedEventArgs e)
        {
            if (user_name.Text != LoginConfig.GetSettingString("UserName") || 
                password.Password != LoginConfig.GetSettingString("Password"))
            {
                MessageBox.Show("用户名或密码错误！");
            }
            else
            {
                (new MainWindow()).Show(); // 显示主窗口;
                Close();
            }
        }
    }