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】");

             }

         }

     }

 }