C#中打日志导出日志到txt文本

         /// <summary>
         /// 打日志
         /// </summary>
         /// <param name="log"></param>

 6         //首先还是要using system.io;     
        public void Write(ArrayList log)
             {
                      //将文件保存在桌面，文件名称为当前时间.txt
                 FileStream fs = new
                                   FileStream("C:\\Users\\ailin\\Desktop\\" +
                                   DateTime.Now.ToLongTimeString().Replace(":", "") + ".txt", FileMode.OpenOrCreate, FileAccess.ReadWrite);
                     StreamWriter sw = new StreamWriter(fs, Encoding.Default);
                     foreach( string i in log)
                     {

                             sw.Write(i.ToString());

                     }
                      DateTime dt1 = DateTime.Now;
                      sw.WriteLine();
                      sw.WriteLine("操作人：cxx");
                      sw.WriteLine("日期："+Convert.ToString(dt1));
                      sw.Flush();
                      sw.Close();
             }

             //string sSaveExcelName =
         //"C:\\" + DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.ToLongTimeString().Replace(":", "") + ".xls";
          public static ArrayList aChg_Slab_Len = new ArrayList();
             private void button2_Click(object sender, EventArgs e)
             {

                     ArrayList cx = new ArrayList();

                     for (int i = ; i < ss1.ActiveSheet.RowCount; i++)
                     {
                         for (int j = ; j < ss1.ActiveSheet.ColumnCount; j++)
                         {
                            cx.Add(ss1.ActiveSheet.Cells[i, j].Text);
                            cx.Add("  ");
                         }
                         cx.Add("\r\n");

                     }
                     //执行导出日志的操作
                     Write(cx);
                     return;

             }