windows-phone-7 - WP7 文本框到 2 个整数

Question

正如您在下面的代码中看到的那样，我只想弄清楚如何判断 HouseholdNoTextBox 中是否有超过 2 个整数。

private void btnContinue1_Click(object sender, RoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(HouseholdNoTextBox.Text))
        {
            textBlockError1.Visibility = Visibility.Visible;
        }
        if (//HouseholdNoTextBox.Text has > than 2 integers input)
        {
            textBlockError1.Visibility = Visibility.Collapsed; // collapse the first error box if it is visible
            textBlockError2.Visibility = Visibility.Visible; // and make visible the second
        }
    }

Answer 1

试试这个

private void btnContinue1_Click(object sender, RoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(HouseholdNoTextBox.Text))
        {
            textBlockError1.Visibility = Visibility.Visible;
        }
int val;
        if (HouseholdNoTextBox.Text.Length>2 && int.TryParse(HouseholdNoTextBox.Text, out val) && val > 99)
        {
            textBlockError1.Visibility = Visibility.Collapsed; // collapse the first error box if it is visible
            textBlockError2.Visibility = Visibility.Visible; // and make visible the second
        }
    }

Answer 2

这是我的最终工作代码。当他带领我朝着正确的方向前进时，我会 +1 Cyber​​maxs 回答

private void btnContinue1_Click(object sender, RoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(HouseholdNoTextBox.Text))
        {
            textBlockError1.Visibility = Visibility.Visible;                
        }
        if (HouseholdNoTextBox.Text.Length >= 3)
        {//checking to see if it has a length greater than 2
            textBlockError1.Visibility = Visibility.Collapsed; // collapse the first error box if it is visible
            textBlockError2.Visibility = Visibility.Visible; // and make visible the second
        }
        if (HouseholdNoTextBox.Text.Length <= 2 && HouseholdNoTextBox.Text.Length > 0)
        {
            textBlockError1.Visibility = Visibility.Collapsed;
            textBlockError2.Visibility = Visibility.Collapsed;
            NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
        }           
    }