private async void loginButton_Click(object sender, RoutedEventArgs e) { StackPanel loginPanel = (StackPanel)accountList.FindName("addAccountPanel"); TextBox usernameTextBox = ((TextBox)loginPanel.FindName("usernameTextBox")); PasswordBox passwordBox = ((PasswordBox)loginPanel.FindName("passwordTextBox")); ComboBox questionComboBox = ((ComboBox)loginPanel.FindName("questionComboBox")); TextBox answerTextBox = ((TextBox)loginPanel.FindName("answerTextBox")); string username = usernameTextBox.Text.Trim().ToLower(); string password = passwordBox.Password.Trim(); int question = questionComboBox.SelectedIndex; string answer = answerTextBox.Text.Trim(); // 清除当前的登录cookie httpClient.ClearCookies(); if (!string.IsNullOrEmpty(username) && !string.IsNullOrEmpty(password)) { bool isOk = await AccountSettings.LoginAndAdd(username, password, question, answer, true); if (isOk) { Refresh(); } else { await new MessageDialog(DataSource.LoginMessage, "账号登录失败").ShowAsync(); } } usernameTextBox.Text = string.Empty; passwordBox.Password = string.Empty; questionComboBox.SelectedIndex = 0; answerTextBox.Text = string.Empty; answerTextBox.Visibility = Windows.UI.Xaml.Visibility.Collapsed; }