vStationURM/vStationTool/MainWindow.xaml.cs

using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace vStationTool
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void portNum_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            e.Handled = !char.IsDigit(e.Text, e.Text.Length - 1);
        }

        private void ipAddress_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            e.Handled = !IsValidIpChar(e.Text);

        }
        private bool IsValidIpChar(string text)
        {
            // 检查是否是数字或.
            return char.IsDigit(text, 0) || text == ".";
        }
    }
}