封装一个ExcelHelper,方便将Excel直接转成Datatable对象
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1 public class ExcelHelper 2 { 3 /// <summary> 4 /// Excel转换成DataTable 5 /// </summary> 6 /// <param name="excelFilePath">excel文件路径</param> 7 /// <param name="sheetNum">sheet序号</param> 8 /// <param name="headerRowNum">标题列序号</param> 9 /// <returns></returns> 10 public static DataTable ExcelToDataTable(string excelFilePath,int sheetNum=0,int headerRowNum=0) 11 { 12 13 IWorkbook workbook; 14 DataTable dt; 15 string extension = Path.GetExtension(excelFilePath).ToLower(); 16 try 17 { 18 using (FileStream fileStream = new FileStream(excelFilePath, FileMode.Open, FileAccess.Read)) 19 { 20 if (extension == ".xlsx") 21 { workbook = new XSSFWorkbook(fileStream); } 22 else 23 { workbook = new HSSFWorkbook(fileStream); } 24 ISheet sheet = workbook.GetSheetAt(sheetNum); 25 dt = new DataTable(sheet.SheetName); 26 IRow headerRow = sheet.GetRow(headerRowNum); 27 string fieldName = ""; 28 //ArrayList fieldArray = new ArrayList(); 29 /* 30 增加标题列,author liwx 2016/08/25 31 */ 32 for (int i = headerRow.FirstCellNum; i < headerRow.LastCellNum; i++) 33 { 34 if (headerRow.GetCell(i) != null) 35 { 36 fieldName = headerRow.GetCell(i).ToString().Trim(); 37 //fieldArray.Add(fieldName); 38 DataColumn column = new DataColumn(fieldName); 39 dt.Columns.Add(column); 40 } 41 else 42 { 43 break; 44 } 45 } 46 47 DataRow dr; 48 IRow row; 49 ICell cell; 50 //short format; 51 for (int i = headerRowNum + 1; i <= sheet.LastRowNum; i++) 52 { 53 row = sheet.GetRow(i); 54 if (row != null) 55 { 56 dr = dt.NewRow(); 57 for (int j = headerRow.FirstCellNum; j < headerRow.LastCellNum; j++) 58 { 59 cell=row.GetCell(j); 60 if (cell != null) 61 { 62 //format = cell.CellStyle.DataFormat; 63 //if (format == 14 || format == 31 || format == 57 || format == 58) 64 // dataRow[j] = cell.DateCellValue.ToString("yyyy/MM/dd");//日期转化格式如需要可解开 65 dr[j] = cell.ToString().Trim() == "" ? null : cell.ToString().Trim(); 66 } 67 else 68 { 69 dr[j] = null; 70 } 71 } 72 dt.Rows.Add(dr); 73 } 74 } 75 } 76 } 77 catch (Exception ex) 78 { 79 throw ex; 80 } 81 return dt; 82 } 83 /// <summary> 84 /// Excel转换成DataTable 85 /// </summary> 86 /// <param name="excelFilePath">excel文件路径</param> 87 /// <param name="sheetName">sheet名称</param> 88 /// <param name="headerRowNum">标题列序号</param> 89 /// <returns></returns> 90 public static DataTable ExcelToDataTable(string excelFilePath, string sheetName, int headerRowNum = 0) 91 { 92 93 IWorkbook workbook; 94 DataTable dt; 95 string extension = Path.GetExtension(excelFilePath).ToLower(); 96 try 97 { 98 using (FileStream fileStream = new FileStream(excelFilePath, FileMode.Open, FileAccess.Read)) 99 { 100 if (extension == ".xlsx") 101 { workbook = new XSSFWorkbook(fileStream); } 102 else 103 { workbook = new HSSFWorkbook(fileStream); } 104 ISheet sheet; 105 //如果有指定工作表名称 106 if (!string.IsNullOrEmpty(sheetName)) 107 { 108 sheet = workbook.GetSheet(sheetName); 109 //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet 110 if (sheet == null) 111 { 112 sheet = workbook.GetSheetAt(0); 113 } 114 } 115 else 116 { 117 //如果没有指定的sheetName，则尝试获取第一个sheet 118 sheet = workbook.GetSheetAt(0); 119 } 120 121 dt = new DataTable(sheet.SheetName); 122 IRow headerRow = sheet.GetRow(headerRowNum); 123 string fieldName = ""; 124 //ArrayList fieldArray = new ArrayList(); 125 /* 126 增加标题列,author liwx 2016/08/25 127 */ 128 for (int i = headerRow.FirstCellNum; i < headerRow.LastCellNum; i++) 129 { 130 if (headerRow.GetCell(i) != null) 131 { 132 fieldName = headerRow.GetCell(i).ToString().Trim(); 133 //fieldArray.Add(fieldName); 134 DataColumn column = new DataColumn(fieldName); 135 dt.Columns.Add(column); 136 } 137 else 138 { 139 break; 140 } 141 } 142 143 DataRow dr; 144 IRow row; 145 ICell cell; 146 //short format; 147 for (int i = headerRowNum + 1; i <= sheet.LastRowNum; i++) 148 { 149 row = sheet.GetRow(i); 150 if (row != null) 151 { 152 dr = dt.NewRow(); 153 for (int j = headerRow.FirstCellNum; j < headerRow.LastCellNum; j++) 154 { 155 cell = row.GetCell(j); 156 if (cell != null) 157 { 158 //format = cell.CellStyle.DataFormat; 159 //if (format == 14 || format == 31 || format == 57 || format == 58) 160 // dataRow[j] = cell.DateCellValue.ToString("yyyy/MM/dd");//日期转化格式如需要可解开 161 dr[j] = cell.ToString().Trim() == "" ? null : cell.ToString().Trim(); 162 } 163 else 164 { 165 dr[j] = null; 166 } 167 } 168 dt.Rows.Add(dr); 169 } 170 } 171 } 172 } 173 catch (Exception ex) 174 { 175 throw ex; 176 } 177 return RemoveEmpty(dt); 178 } 179 /// <summary> 180 /// 获取Excel里Sheet总数 181 /// </summary> 182 /// <param name="excelFilePath"></param> 183 /// <returns></returns> 184 public static int GetExcelSheetTotal(string excelFilePath) 185 { 186 IWorkbook workbook; 187 DataTable dt; 188 string extension = Path.GetExtension(excelFilePath).ToLower(); 189 try 190 { 191 using (FileStream fileStream = new FileStream(excelFilePath, FileMode.Open, FileAccess.Read)) 192 { 193 if (extension == ".xlsx") 194 { workbook = new XSSFWorkbook(fileStream); } 195 else 196 { workbook = new HSSFWorkbook(fileStream); } 197 return workbook.NumberOfSheets; 198 } 199 } 200 catch (Exception ex) 201 { 202 throw ex; 203 } 204 } 205 206 /// <summary> 207 /// 将datatable导入到exel 208 /// </summary> 209 /// <param name="datatemp"></param> 210 /// <param name="fileName"></param> 211 ///<param name="removeEmpty">是否去除所有值都为空的列</param> 212 /// <returns></returns> 213 public static int DataTableToExcel(DataTable datatemp, string fileName,bool removeEmpty=true) 214 { 215 DataTable data = removeEmpty? RemoveEmpty(datatemp): datatemp; 216 bool isColumnWritten = true; 217 int i = 0; 218 int j = 0; 219 int count = 0; 220 ISheet sheet = null; 221 IWorkbook workbook = null; 222 using (FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite)) 223 { 224 if (fileName.IndexOf(".xlsx") > 0) // 2007版本 225 workbook = new XSSFWorkbook(); 226 else if (fileName.IndexOf(".xls") > 0) // 2003版本 227 workbook = new HSSFWorkbook(); 228 229 try 230 { 231 if (workbook != null) 232 { 233 sheet = workbook.CreateSheet("Sheet1"); 234 } 235 else 236 { 237 return -1; 238 } 239 240 if (isColumnWritten == true) //写入DataTable的列名 241 { 242 IRow row = sheet.CreateRow(0); 243 for (j = 0; j < data.Columns.Count; ++j) 244 { 245 row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName); 246 } 247 count = 1; 248 } 249 else 250 { 251 count = 0; 252 } 253 254 for (i = 0; i < data.Rows.Count; ++i) 255 { 256 IRow row = sheet.CreateRow(count); 257 for (j = 0; j < data.Columns.Count; ++j) 258 { 259 row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); 260 } 261 ++count; 262 } 263 workbook.Write(fs); //写入到excel 264 return count; 265 } 266 catch (Exception ex) 267 { 268 Console.WriteLine("Exception: " + ex.Message); 269 return -1; 270 } 271 } 272 } 273 274 275 276 /// <summary> 277 /// Excel导出成内存流 278 /// </summary> 279 /// <param name="data"></param> 280 /// <returns></returns> 281 public static MemoryStream DataTableToExcel(DataTable data) 282 { 283 bool isColumnWritten = true; 284 int i = 0; 285 int j = 0; 286 int count = 0; 287 IWorkbook workbook =new HSSFWorkbook(); 288 try 289 { 290 //添加一个sheet 291 ISheet sheet = workbook.CreateSheet("Sheet1"); 292 //将数据逐步写入sheet1各个行 293 if (isColumnWritten == true) //写入DataTable的列名 294 { 295 IRow row = sheet.CreateRow(0); 296 for (j = 0; j < data.Columns.Count; ++j) 297 { 298 row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName); 299 } 300 count = 1; 301 } 302 else 303 { 304 count = 0; 305 } 306 307 for (i = 0; i < data.Rows.Count; ++i) 308 { 309 IRow row = sheet.CreateRow(count); 310 for (j = 0; j < data.Columns.Count; ++j) 311 { 312 row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); 313 } 314 ++count; 315 } 316 // 写入到客户端 317 MemoryStream ms = new System.IO.MemoryStream(); 318 workbook.Write(ms); 319 ms.Seek(0, SeekOrigin.Begin); 320 return ms; 321 } 322 catch (Exception ex) 323 { 324 throw ex; 325 Console.WriteLine("Exception: " + ex.Message); 326 return null; 327 } 328 } 329 330 331 332 333 /// <summary> 334 /// Excel导出成内存流 335 /// </summary> 336 /// <param name="data"></param> 337 /// <returns></returns> 338 public static MemoryStream DataTableToExcel(List<DataTable> dtList,List<string> nameList) 339 { 340 IWorkbook workbook = new HSSFWorkbook(); 341 try 342 { 343 var data = dtList[0]; 344 for (var i=0;i<dtList.Count();i++) { 345 ISheet sheet=string.IsNullOrWhiteSpace(nameList[i]) ?workbook.CreateSheet("Sheet"+(i+1)):workbook.CreateSheet(nameList[i]); 346 WriteSheet(dtList[i],sheet); 347 } 348 // 写入到客户端 349 MemoryStream ms = new System.IO.MemoryStream(); 350 workbook.Write(ms); 351 ms.Seek(0, SeekOrigin.Begin); 352 return ms; 353 } 354 catch (Exception ex) 355 { 356 throw ex; 357 Console.WriteLine("Exception: " + ex.Message); 358 return null; 359 } 360 } 361 362 363 364 private static void WriteSheet(DataTable data,ISheet sheet, bool isColumnWritten=true) { 365 int i = 0; 366 int j = 0; 367 int count = 0; 368 //将数据逐步写入sheet1各个行 369 if (isColumnWritten == true) //写入DataTable的列名 370 { 371 IRow row = sheet.CreateRow(0); 372 for (j = 0; j < data.Columns.Count; ++j) 373 { 374 row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName); 375 } 376 count = 1; 377 } 378 else 379 { 380 count = 0; 381 } 382 383 for (i = 0; i < data.Rows.Count; ++i) 384 { 385 IRow row = sheet.CreateRow(count); 386 for (j = 0; j < data.Columns.Count; ++j) 387 { 388 row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); 389 } 390 ++count; 391 } 392 393 } 394 /// <summary> 395 /// 去除空行 396 /// </summary> 397 /// <param name="dtr"></param> 398 /// <returns></returns> 399 protected static DataTable RemoveEmpty(DataTable dtr) 400 { 401 DataTable dt = dtr; 402 List<DataRow> removelist = new List<DataRow>(); 403 for (int i = 0; i < dt.Rows.Count; i++) 404 { 405 bool IsNull = true; 406 for (int j = 0; j < dt.Columns.Count; j++) 407 { 408 if (!string.IsNullOrEmpty(dt.Rows[i][j].ToString().Trim())) 409 { 410 IsNull = false; 411 } 412 } 413 if (IsNull) 414 { 415 removelist.Add(dt.Rows[i]); 416 } 417 } 418 for (int i = 0; i < removelist.Count; i++) 419 { 420 dt.Rows.Remove(removelist[i]); 421 } 422 return dt; 423 } 424 }
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