C#实现单词本功能

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
 
 
namespace WindowsFormsApp6
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }
 
  private void button2_Click(object sender, EventArgs e)
  {
   textBox1.Clear();//每点击一次选择文件按钮自动清空文本框内已经打开的文件内容
   textBox2.Clear();//清空文件路径的内容
   OpenFileDialog filename = new OpenFileDialog();//定义打开文件
   filename.InitialDirectory = Application.StartupPath;//初始路径
   filename.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";//设置打开文件的类型
   filename.FilterIndex = 2;//设置文件类型的显示顺序
   
   if (filename.ShowDialog() == DialogResult.OK)
   {
    textBox2.Text = filename.FileName.ToString();//将路径显示在文本框
    StreamReader sr = new StreamReader(filename.FileName, Encoding.Default);
    //将文件通过stream流读取
    string content = sr.ReadToEnd();//把文件读完存给content
    string[] lines = content.Split('\n');//将文件内容分割成一行一行存给数组
    for (int i = 0; i < lines.Length; i++)
    {
 
     textBox1.Text += lines[i++]+"\n";
 
 
     //List<string> english = new List<string>();
     //List<string> chinese = new List<string>();
     //string[] words = lines[i].Trim().Split('\t');
     //if (words.Length < 2)
     //continue;
     //english.Add(words[0]);
     //chinese.Add(words[1]);
      
    }  
    sr.Close();
   }
  }
 
  private void button1_Click(object sender, EventArgs e)
  {
   textBox1.Clear();//此处点击返回按钮同样自动清空文本框文件内容
   textBox2.Clear();//清除文件路径内容
  }
 }
}