NPOI解决由于excel删除数据导致空行读取问题

1。解决问题思路一：申明判断是否空行变量用于判断是否空行，声明变量数组用于临时非空行数据，最后存于datatable中。

 /// <summary>读取excel，
          /// 默认第一行为表头
          /// </summary>
          /// <param name="strFileName">excel文档绝对路径</param>
          /// <param name="rowIndex">内容行偏移量，第一行为表头，内容行从第二行开始则为1</param>
          /// <returns></returns>
          public static DataTable Import(string strFileName, int rowIndex)
          {
              DataTable dt = new DataTable();

              IWorkbook hssfworkbook;
              using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
              {
                  hssfworkbook = WorkbookFactory.Create(file);
              }
              ISheet sheet = hssfworkbook.GetSheetAt();

              IRow headRow = sheet.GetRow();
              if (headRow != null)
              {
                  int colCount = headRow.LastCellNum;
                  for (int i = ; i < colCount; i++)
                  {
                      dt.Columns.Add("COL_" + i);
                  }
              }

              for (int i = (sheet.FirstRowNum + rowIndex); i <= sheet.LastRowNum; i++)
              {
                  IRow row = sheet.GetRow(i);
                  bool emptyRow = true;
                  object[] itemArray = null;

                  if (row != null)
                  {
                      itemArray = new object[row.LastCellNum];

                      for (int j = row.FirstCellNum; j < row.LastCellNum; j++)
                      {

                          if (row.GetCell(j) != null)
                          {

                              switch (row.GetCell(j).CellType)
                              {
                                  case CellType.NUMERIC:
                                      if (HSSFDateUtil.IsCellDateFormatted(row.GetCell(j)))//日期类型
                                      {
                                          itemArray[j] = row.GetCell(j).DateCellValue.ToString("yyyy-MM-dd");
                                      }
                                      else//其他数字类型
                                      {
                                          itemArray[j] = row.GetCell(j).NumericCellValue;
                                      }
                                      break;
                                  case CellType.BLANK:
                                      itemArray[j] = string.Empty;
                                      break;
                                  case CellType.FORMULA:
                                      if (Path.GetExtension(strFileName).ToLower().Trim() == ".xlsx")
                                      {
                                          XSSFFormulaEvaluator eva = new XSSFFormulaEvaluator(hssfworkbook);
                                          if (eva.Evaluate(row.GetCell(j)).CellType == CellType.NUMERIC)
                                          {
                                               if (HSSFDateUtil.IsCellDateFormatted(row.GetCell(j)))//日期类型
                                               {
                                                   itemArray[j] = row.GetCell(j).DateCellValue.ToString("yyyy-MM-dd");
                                               }
                                               else//其他数字类型
                                               {
                                                   itemArray[j] = row.GetCell(j).NumericCellValue;
                                               }
                                          }
                                          else
                                          {
                                              itemArray[j] = eva.Evaluate(row.GetCell(j)).StringValue;
                                          }
                                      }
                                      else
                                      {
                                          HSSFFormulaEvaluator eva = new HSSFFormulaEvaluator(hssfworkbook);
                                          if (eva.Evaluate(row.GetCell(j)).CellType == CellType.NUMERIC)
                                          {
                                               if (HSSFDateUtil.IsCellDateFormatted(row.GetCell(j)))//日期类型
                                               {
                                                   itemArray[j] = row.GetCell(j).DateCellValue.ToString("yyyy-MM-dd");
                                               }
                                               else//其他数字类型
                                               {
                                                   itemArray[j] = row.GetCell(j).NumericCellValue;
                                               }
                                          }
                                          else
                                          {
                                              itemArray[j] = eva.Evaluate(row.GetCell(j)).StringValue;
                                          }
                                      }
                                      break;
                                  default:
                                      itemArray[j] = row.GetCell(j).StringCellValue;
                                      break;

                              }

                              if (itemArray[j] != null && !string.IsNullOrEmpty(itemArray[j].ToString().Trim()))
                              {
                                  emptyRow = false;
                              }
                          }
                      }
                  }

                  //非空数据行数据添加到DataTable
                  if (!emptyRow)
                  {
                      dt.Rows.Add(itemArray);
                  }
              }
              return dt;
          }

2.思路二：对excel存于datatable中的空行进行遍历处理

 protected void RemoveEmpty(DataTable dt)
         {
             List<DataRow> removelist = new List<DataRow>();
             for (int i = ; i < dt.Rows.Count; i++)
             {
                 bool IsNull = true;
                 for (int j = ; j < dt.Columns.Count; j++)
                 {
                     if (!string.IsNullOrEmpty(dt.Rows[i][j].ToString().Trim()))
                     {
                         IsNull = false;
                     }
                 }
                 if (IsNull)
                 {
                     removelist.Add(dt.Rows[i]);
                 }
             }
             for (int i = ; i < removelist.Count; i++)
             {
                 dt.Rows.Remove(removelist[i]);
             }
         }