Excel 相关

Posted 2021-03-22 yzm97

 

 

  1     static public class ImportExcel
  2     {
  3         public static DataTable GetExcelDataTable(string filePath)
  4         {
  5             IWorkbook Workbook;
  6             DataTable table = new DataTable();
  7             try
  8             {
  9                 using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
 10                 {
 11                     //XSSFWorkbook 适用XLSX格式，HSSFWorkbook 适用XLS格式
 12                     string fileExt = Path.GetExtension(filePath).ToLower();
 13                     if (fileExt == ".xls")
 14                     {
 15                         Workbook = new HSSFWorkbook(fileStream);
 16                     }
 17                     else if (fileExt == ".xlsx")
 18                     {
 19                         Workbook = new XSSFWorkbook(fileStream);
 20                     }
 21                     else
 22                     {
 23                         Workbook = null;
 24                     }
 25                 }
 26             }
 27             catch (Exception ex)
 28             {
 29                 throw ex;
 30             }
 31             //定位在第一个sheetActiveSheetIndex
 32             ISheet sheet = Workbook.GetSheetAt(0);
 33             //int  sheet1 = Workbook.NumberOfSheets;//总共有多少页码
 34             //第一行为标题行
 35             IRow headerRow = sheet.GetRow(0);
 36             int cellCount = headerRow.LastCellNum;
 37             int rowCount = sheet.LastRowNum;
 38 
 39             //循环添加标题列
 40             for (int i = headerRow.FirstCellNum; i < cellCount; i++)
 41             {
 42                 DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
 43                 table.Columns.Add(column);
 44             }
 45 
 46             //数据
 47             for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
 48             {
 49                 IRow row = sheet.GetRow(i);
 50                 DataRow dataRow = table.NewRow();
 51                 if (row != null)
 52                 {
 53                     for (int j = row.FirstCellNum; j < cellCount; j++)
 54                     {
 55                         if (row.GetCell(j) != null)
 56                         {
 57                             dataRow[j] = GetCellValue(row.GetCell(j));
 58                         }
 59                     }
 60                 }
 61                 table.Rows.Add(dataRow);
 62             }
 63             return table;
 64         }
 65 
 66         private static string GetCellValue(ICell cell)
 67         {
 68             if (cell == null)
 69             {
 70                 return string.Empty;
 71             }
 72 
 73             switch (cell.CellType)
 74             {
 75                 case CellType.Blank:
 76                     return string.Empty;
 77                 case CellType.Boolean:
 78                     return cell.BooleanCellValue.ToString();
 79                 case CellType.Error:
 80                     return cell.ErrorCellValue.ToString();
 81                 case CellType.Numeric:
 82                 case CellType.Unknown:
 83                 default:
 84                     return cell.ToString();
 85                 case CellType.String:
 86                     return cell.StringCellValue;
 87                 case CellType.Formula:
 88                     try
 89                     {
 90                         HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);
 91                         e.EvaluateInCell(cell);
 92                         return cell.ToString();
 93                     }
 94                     catch
 95                     {
 96                         return cell.NumericCellValue.ToString();
 97                     }
 98             }
 99         }
100     }