MainWindow.xaml.cs

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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 数学口算题
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void btn_Make_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                txt_Result.Text = "";
                int QuestionNumber = 0;
                try { QuestionNumber = Convert.ToInt32(txt_QuestionNum.Text); } catch { }
                for (int i = 0; i < QuestionNumber; i++)
                {
                    if (!string.IsNullOrEmpty(txt_Result.Text))
                        txt_Result.Text += System.Environment.NewLine;
                    txt_Result.Text += MakeQuestion();
                }
            }
            catch (Exception ex)
            {

            }
        }

        private Random rnd = new Random();
        private string MakeQuestion()
        {
            string Question = "";
            Func<string> GetMethod = () => {
                string m = "+";
                if (rnd.Next(9) > 5)
                    m = "-";
                return m;
            };
            string method = GetMethod();
            Func<int, int> GetDigit = (max) => {
                int number = 0;
                int min = 1;
                if (chk_lessThan20?.IsChecked ?? false)
                {
                    int mmax = max;