WPF中TextBox失去焦点事件

限制TextBox只能输入整数，而且整数的数值范围为0-100。如果输入101后，弹窗提示输入超限

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MainWindow.xaml

 <TextBox x:Name="textBox1" TextWrapping="Wrap" Text="TextBox" Width="120" Height="50" LostFocus="myTextBox_LostFocus"/>

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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 NumRange2
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void myTextBox_LostFocus(object sender, RoutedEventArgs e)
        {
            // 在这里添加你的处理代码
            string textVal = textBox1.Text;
            try
            {
                int numVal = int.Parse(textVal);
                if (numVal > 100 || numVal < 0)
                {
                    MessageBox.Show("输入超限");
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show("请输入一个整数");
            }
            
        }
    }
}