写入txt文件

    DateTime datatimes;
    datatimes=DateTime.Now;
    string filepath=System.Configuration.ConfigurationSettings.AppSettings["ConnenctionStringBaseData"]+SCode+datatimes.ToString("yyyy-MM-dd").Substring(0,4)+datatimes.ToString("yyyy-MM-dd").Substring(5,2)+datatimes.ToString("yyyy-MM-dd").Substring(8,2)+".txt";
    StreamWriter sw=new StreamWriter(filepath,false,System.Text.Encoding.Default); 
    sw.BaseStream.Seek(0, SeekOrigin.End);//设置写数据流的起始位置为文件流的末尾

    for(int i=0;i<ds.Tables[0].Rows.Count;i++)
    {
     sw.Write("\"{0}\" \"{1}\" \"{2}\" \"{3}\" \"{4}\" \"{5}\" \"{6}\" \"{7}\" \"{8}\" \r\n", 
      ds.Tables[0].Rows[i][0].ToString(),
      ds.Tables[0].Rows[i][1].ToString(),
      ds.Tables[0].Rows[i][2].ToString(),
      ds.Tables[0].Rows[i][3].ToString(),
      ds.Tables[0].Rows[i][4].ToString(),
      ds.Tables[0].Rows[i][5].ToString(),
      ds.Tables[0].Rows[i][6].ToString(),
      ds.Tables[0].Rows[i][7].ToString(),
      ds.Tables[0].Rows[i][8].ToString()   
      ); 
    }
    sw.Flush();
    sw.Close();

转载于:https://www.cnblogs.com/heartinsky/archive/2008/04/01/1091399.html