C#读写文本文件，字符串截取

 static void Main(string[] args)
        {
            string txt = "";
            StreamReader sr = new StreamReader(@"E:\test.txt",Encoding.GetEncoding("gb2312"));//读文件流，后面的文件标码不可少，不然有汉字就是乱码。
            StreamWriter sw = new StreamWriter(@"E:\123.txt", true, Encoding.GetEncoding("gb2312"));//写文件流，

            string[] s1 = new string[600];
            int i = 0;
            while (!sr.EndOfStream)
            {
                string str = sr.ReadLine();
                s1[i] = str.Replace(" ","");//去除空格
//s1[i]= SubString(str,1,2);//从1位置截取2个字符
                sw.Write(s1[i]+"\r\n");
                i++;
                txt += str + "\n";
            }
            sr.Close();

            Console.Write(txt);
            for (int j = 0; j < 234; j++)
            {
                sw.Write(s1[i]);
                Console.WriteLine(s1[i]);
            }
            sw.Close();
            Console.ReadLine();

这两天帮老师整企业录入，要涉及到去除空格，提取地址中的省份、地区等操作，数据量较大，所以写了个简单的程序瞬间完成。呵呵·····水平有限，也就能写出这档次