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 }
原文地址：https://www.cnblogs.com/zzlblog/p/10013069.html
时间： 2024-10-12 21:22:37