在textbox C# WPF中允许十六进制

using System;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Controls;

namespace WpfApp
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            textBox.TextChanged += TextBox_TextChanged;
        }

        private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            string input = textBox.Text;
            if (!IsValidHex(input))
            {
                MessageBox.Show("请输入有效的十六进制数！");
                textBox.Text = string.Empty;
            }
        }

        private bool IsValidHex(string input)
        {
            if (string.IsNullOrEmpty(input))
                return false;

            // 正则表达式匹配十六进制数
            string pattern = @"^0x[0-9A-Fa-f]+$";
            Regex regex = new Regex(pattern);
            return regex.IsMatch(input);
        }
    }
}

private int HexToDecimal(string hex)
{
    if (IsValidHex(hex))
    {
        return Convert.ToInt32(hex, 16);
    }
    else
    {
        throw new ArgumentException("输入不是有效的十六进制数");
    }
}