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使用StreamReader和StreamWriter读写　txt file.//读      public string ReadTxtFile(string path)    //ReadAll("A:\\test.txt");        {
               using (StreamReader sr = new StreamReader(path, Encoding.Default))            {
                   return (sr.ReadToEnd().ToString());                //while ((line = sr.ReadLine()) != null)　 一行一行读                //{
                   //    Console.WriteLine(line.ToString());                //}            }                   }//写        public void WriteToTxtFile(string path,string content)        {
               FileStream fs = new FileStream(path, FileMode.Create);            StreamWriter sw = new StreamWriter(fs);            //写入            sw.Write(content);            //清空缓冲区            sw.Flush();            //关闭流            sw.Close();            fs.Close();        }

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