首先是给项目安装NPOI.DLL ：Install-Package NPOI -Version 2.4.1
1 HttpPostedFile upLoadPostFile = FileUpload1.PostedFile; 2 string upLoadPath = upLoadPostFile.FileName; 3 //ExcelToDataTable(upLoadPath); 4 string outs=""; 5 DataSet ds= ExcelToDataSet(upLoadPath, outs); 6 DataTable dtInfo = ds.Tables[0]; 7 string ss = ""; 8 for (int i = 0; i < dtInfo.Rows.Count; i++) 9 { 10 //ss = dtInfo.Rows[i].ToString(); 11 ss = dtInfo.Rows[i+1][0].ToString(); 12 }
1 /// <summary> 2 /// Excel转换成DataSet（.xlsx/.xls） 3 /// </summary> 4 /// <param name="filePath">Excel文件路径</param> 5 /// <param name="strMsg"></param> 6 /// <returns></returns> 7 public static DataSet ExcelToDataSet(string filePath, string strMsg) 8 { 9 strMsg = ""; 10 DataSet ds = new DataSet(); 11 DataTable dt = new DataTable(); 12 string fileType = Path.GetExtension(filePath).ToLower(); 13 string fileName = Path.GetFileName(filePath).ToLower(); 14 try 15 { 16 ISheet sheet = null; 17 int sheetNumber = 0; 18 FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read); 19 if (fileType == ".xlsx") 20 { 21 // 2007版本 22 XSSFWorkbook workbook = new XSSFWorkbook(fs); 23 sheetNumber = workbook.NumberOfSheets; 24 for (int i = 0; i < sheetNumber; i++) 25 { 26 string sheetName = workbook.GetSheetName(i); 27 sheet = workbook.GetSheet(sheetName); 28 if (sheet != null) 29 { 30 dt = GetSheetDataTable(sheet, strMsg); 31 if (dt != null) 32 { 33 dt.TableName = sheetName.Trim(); 34 ds.Tables.Add(dt); 35 } 36 else 37 { 38 MessageBox.Show("Sheet数据获取失败，原因：" + strMsg); 39 } 40 } 41 } 42 } 43 else if (fileType == ".xls") 44 { 45 // 2003版本 46 HSSFWorkbook workbook = new HSSFWorkbook(fs); 47 sheetNumber = workbook.NumberOfSheets; 48 for (int i = 0; i < sheetNumber; i++) 49 { 50 string sheetName = workbook.GetSheetName(i); 51 sheet = workbook.GetSheet(sheetName); 52 if (sheet != null) 53 { 54 dt = GetSheetDataTable(sheet, strMsg); 55 if (dt != null) 56 { 57 dt.TableName = sheetName.Trim(); 58 ds.Tables.Add(dt); 59 } 60 else 61 { 62 MessageBox.Show("Sheet数据获取失败，原因：" + strMsg); 63 } 64 } 65 } 66 } 67 return ds; 68 } 69 catch (Exception ex) 70 { 71 strMsg = ex.Message; 72 return null; 73 } 74 } 75 /// <summary> 76 /// 获取sheet表对应的DataTable 77 /// </summary> 78 /// <param name="sheet">Excel工作表</param> 79 /// <param name="strMsg"></param> 80 /// <returns></returns> 81 private static DataTable GetSheetDataTable(ISheet sheet, string strMsg) 82 { 83 strMsg = ""; 84 DataTable dt = new DataTable(); 85 string sheetName = sheet.SheetName; 86 int startIndex = 0;// sheet.FirstRowNum; 87 int lastIndex = sheet.LastRowNum; 88 //最大列数 89 int cellCount = 0; 90 IRow maxRow = sheet.GetRow(0); 91 for (int i = startIndex; i <= lastIndex; i++) 92 { 93 IRow row = sheet.GetRow(i); 94 if (row != null && cellCount < row.LastCellNum) 95 { 96 cellCount = row.LastCellNum; 97 maxRow = row; 98 } 99 } 100 //列名设置 101 try 102 { 103 for (int i = 0; i < maxRow.LastCellNum; i++)//maxRow.FirstCellNum 104 { 105 dt.Columns.Add(Convert.ToChar(((int)'A') + i).ToString()); 106 //DataColumn column = new DataColumn("Column" + (i + 1).ToString()); 107 //dt.Columns.Add(column); 108 } 109 } 110 catch 111 { 112 strMsg = "工作表" + sheetName + "中无数据"; 113 return null; 114 } 115 //数据填充 116 for (int i = startIndex; i <= lastIndex; i++) 117 { 118 IRow row = sheet.GetRow(i); 119 DataRow drNew = dt.NewRow(); 120 if (row != null) 121 { 122 for (int j = row.FirstCellNum; j < row.LastCellNum; ++j) 123 { 124 if (row.GetCell(j) != null) 125 { 126 ICell cell = row.GetCell(j); 127 switch (cell.CellType) 128 { 129 case CellType.Blank: 130 drNew[j] = ""; 131 break; 132 case CellType.Numeric: 133 short format = cell.CellStyle.DataFormat; 134 //对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理 135 if (format == 14 || format == 31 || format == 57 || format == 58) 136 drNew[j] = cell.DateCellValue; 137 else 138 drNew[j] = cell.NumericCellValue; 139 if (cell.CellStyle.DataFormat == 177 || cell.CellStyle.DataFormat == 178 || cell.CellStyle.DataFormat == 188) 140 drNew[j] = cell.NumericCellValue.ToString("#0.00"); 141 break; 142 case CellType.String: 143 drNew[j] = cell.StringCellValue; 144 break; 145 case CellType.Formula: 146 try 147 { 148 drNew[j] = cell.NumericCellValue; 149 if (cell.CellStyle.DataFormat == 177 || cell.CellStyle.DataFormat == 178 || cell.CellStyle.DataFormat == 188) 150 drNew[j] = cell.NumericCellValue.ToString("#0.00"); 151 } 152 catch 153 { 154 try 155 { 156 drNew[j] = cell.StringCellValue; 157 } 158 catch { } 159 } 160 break; 161 default: 162 drNew[j] = cell.StringCellValue; 163 break; 164 } 165 } 166 } 167 } 168 dt.Rows.Add(drNew); 169 } 170 return dt; 171 } 172 }