c# 第一个实例 通哥

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using System.IO;

 namespace tongge
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         public double a, b, c;
         string path;

         private void textBox1_TextChanged(object sender, EventArgs e)
         {
             try
             {
                 a = Convert.ToDouble(textBox1.Text);
             }
             catch (Exception)
             {
                 DialogResult dr = MessageBox.Show("您输入的高度不是数字", "错误提示", MessageBoxButtons.OKCancel);
                 throw;
             }

         }

         private void textBox2_TextChanged(object sender, EventArgs e)
         {
             b = Convert.ToDouble(textBox2.Text);
         }

         public void textBox3_TextChanged(object sender, EventArgs e)
         {

         }

         private void button1_Click(object sender, EventArgs e)
         {

             //string path = @"C:\Users\Administrator\Desktop\岩层厚度.txt";

             OpenFileDialog openFileDialog = new OpenFileDialog();
             openFileDialog.InitialDirectory = @"C:\Users\Administrator\Desktop";
             openFileDialog.Filter = "(*.txt)|*.txt";
             openFileDialog.RestoreDirectory = true;
             openFileDialog.FilterIndex = ;
             if (openFileDialog.ShowDialog() == DialogResult.OK)
             {
                 path = openFileDialog.FileName;
             }

             string[] contents = File.ReadAllLines(path, Encoding.Default);
             for (int i = ; i < contents.Length; i++)
             {
                 string[] strNew = contents[i].Split(new char[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
                 if (i == )
                 {
                     textBox1.Text = strNew[];
                 }
                 if (i == )
                 {
                     textBox2.Text = strNew[];
                 }
                 c = a + b;
                 textBox3.Text = Convert.ToString(c);

                 // Console.WriteLine("{0} {1} {2}", strNew[0], strNew[1],);
             }
         }

         public void Form1_Load(object sender, EventArgs e)
         {
             //textBox1.Text = "3.00";
             //textBox2.Text = "4.00";
             DialogResult dr = MessageBox.Show("欢迎使用中国矿业大学编制的软件", "欢迎使用", MessageBoxButtons.OKCancel);

         }

         private void button2_Click_1(object sender, EventArgs e)
         {
             DialogResult dr = MessageBox.Show("确认删除吗？", "提示", MessageBoxButtons.OKCancel);
             if (dr == DialogResult.OK)
             {
                 //用户选择确认的操作
                 MessageBox.Show("您选择的是【确认】");
             }
             else if (dr == DialogResult.Cancel)
             {
                 //用户选择取消的操作
                 MessageBox.Show("您选择的是【取消】");
             }

         }

     }
 }