private async void btnLogin_Click(object sender, RoutedEventArgs e)
        {
            if (txtAccount.Text.Length <= 0 || txtPassword.Password.Length <= 0)
            {
                return;
            }
            bool isLoginSuccess = UserAccountHelper.Login(txtAccount.Text, txtPassword.Password).Result;

            if (isLoginSuccess)
            {
                await new MessageBox("登录成功!", MessageBox.NotifyType.CommonMessage).ShowAsync();
            }
            else
            {
                await new MessageBox("登录失败!", MessageBox.NotifyType.CommonMessage).ShowAsync();
            }
        }
        public async Task <IActionResult> Login([FromBody] UserLoginModel model)
        {
            try
            {
                if (!ModelState.IsValid)
                {
                    return(BadRequest("Login Failed"));
                }

                var client = (await userAccountHelper.Login(model)).User;
                if (client != null)
                {
                    return(Ok(client));
                }
                else
                {
                    return(BadRequest("Login Failed !"));
                }
            }
            catch (Exception ex)
            {
                return(BadRequest(ex));
            }
        }