递归方法练习

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;

namespace 递归练习2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// 

        /// 开始计算
        /// 
        /// 
        /// 
        private void btnCalculate_Click(object sender, EventArgs e)
        {
            try
            {
                if (byte.TryParse(tbx1.Text, out byte result1) && 
                    byte.TryParse(tbx2.Text, out byte result2))
                {
                    //溢出检查
                    checked
                    {
                        tbxResult.Text = ((byte)(result1 + result2)).ToString();
                    }
                }
                else
                {
                    MessageBox.Show("请输入0~255内的数字");
                }
            }
            catch (Exception ex)
            {
                Type type = ex.GetType();
                MessageBox.Show(type.Name + "\n" + ex.StackTrace);
            }
        }
        /// 

        /// 清除文本框中的数据
        /// 
        /// 
        /// 
        private void btnClear_Click(object sender, EventArgs e)
        {
            List textBoxes = new List();
            textBoxes = FindTBox(groupBox2);
            foreach (var item in textBoxes)
                item.Clear();
        }

        /// 

        /// 返回指定控件中的T类型的所有控件的列表。
        /// 
        /// 要查询的控件类型
        /// 指定控件的实例对象
        /// 
        private List FindTBox(IComponent control)
        {
            List results = new List();
            if (typeof(T) == control.GetType())
            {
                results.Add((T)control);
            }
            if (typeof(Control).IsAssignableFrom(control.GetType()))
            {
                foreach (IComponent item in ((Control)control).Controls)
                {
                    results.AddRange(FindTBox(item)); 
                }
            }
            return results;
        }
    }
}