用泛型集合做的小翻译器

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 lianxi6
{
public partial class Form1 : Form
{
Dictionary<char, char> dic = new Dictionary<char, char>();
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)//加载时把翻译加到字典里
{
string[] line = File.ReadAllLines("ST.txt");//建立个string数组接受文件里内容，将文件放在debug中（）中参数为路径，在这里就是文件名
for (int i = 0; i < line.Length; i++)//遍历数组line将line中内容加到字典里（包含键和值）；
{

dic.Add(line[i][0], line[i][2]);//用二维数组
}
}

private void fanyi_Click(object sender, EventArgs e)
{
string str= jianti.Text.Trim();
StringBuilder sb=new StringBuilder();
for (int i = 0; i < str.Length; i++)
{
if (dic.ContainsKey(str[i]))
{
sb.Append(dic[str[i]]);//把对应键的值加到sb中
}
else { sb.Append(str[i]); }
}
fanti.Text = sb.ToString();
}
}
}