filePath="s.txt" ;

private bool writeFile()

        {             StreamWriter sw;             try             {                 sw = File.CreateText(filePath);                 sw.WriteLine("这是写入的内容");                 sw.Close();                 sw.Dispose();                 return true;             }             catch(Exception ex)             {                 return false;             }                    }                 private String readFile()         {             StreamReader sr = new StreamReader(filePath, System.Text.Encoding.Default);                       string strRead="";             try             {                 strRead = sr.ReadLine();                 sr.Close();               }             catch             {                 MessageBox.Show("文件读取失败");             }             return strRead;         }