/// <summary>
 /// 检查第四行
 /// </summary>
 /// <returns></returns>
 private bool check4thRow(List <String> excelPathList, out int maxColIndex)
 {
     maxColIndex = 0;
     //先清除所有记录。
     AR_Temp.deleteTheARTemp();
     foreach (string excelPath in excelPathList)
     {
         //打开文档
         MyExcel myExcel = new MyExcel(excelPath);
         myExcel.open();
         Worksheet firstWS = myExcel.getFirstWorkSheetAfterOpen();
         string    fileNameWithoutSuffix = DirectoryHelper.getFileNameWithoutSuffix(excelPath);
         int       checkedColIndex       = 0;
         if (!AttendanceRHelper.isAllDigit(firstWS, 4, out checkedColIndex))
         {
             myExcel.close();
             lblPrompt.Visible = false;
             ShowResult.show(lblResult, fileNameWithoutSuffix + ": 第4行" + checkedColIndex.ToString() + "列非数字;   导入取消。", false);
             timerRestoreTheLblResult.Start();
             return(false);
         }
         if (maxColIndex == 0)
         {
             Usual_Excel_Helper uEHelper = new Usual_Excel_Helper(firstWS);
             maxColIndex = uEHelper.getMaxColIndexBeforeBlankCellInSepcificRow(4);
         }
         myExcel.close();
     }
     return(true);
 }