NPOI操作EXCEL

本文轉載自查看原文 2019-05-11 15:59 5724 excel/ C#.NET/ NPOI/ DAL
  1     public class NPOIExcel
  2     {
  3         /// <summary>
  4         /// 將excel導入到datatable
  5         /// </summary>
  6         /// <param name="filePath">excel路徑</param>
  7         /// <param name="isColumnName">第一行是否是列名</param>
  8         /// <returns>返回datatable</returns>
  9         public static DataTable ExcelToDataTable(string filePath, bool isColumnName)
 10         {
 11             DataTable dataTable = null;
 12             FileStream fs = null;
 13             DataColumn column = null;
 14             DataRow dataRow = null;
 15             IWorkbook workbook = null;
 16             ISheet sheet = null;
 17             IRow row = null;
 18             ICell cell = null;
 19             int startRow = 0;
 20             try
 21             {
 22                 using (fs = File.OpenRead(filePath))
 23                 {
 24                     // 2007版本
 25                     if (filePath.IndexOf(".xlsx") > 0)
 26                         workbook = new XSSFWorkbook(fs);
 27                     // 2003版本
 28                     else if (filePath.IndexOf(".xls") > 0)
 29                         workbook = new HSSFWorkbook(fs);
 30 
 31                     if (workbook != null)
 32                     {
 33                         sheet = workbook.GetSheetAt(0);//讀取第一個sheet，當然也可以循環讀取每個sheet
 34                         dataTable = new DataTable();
 35                         if (sheet != null)
 36                         {
 37                             int rowCount = sheet.LastRowNum;//總行數
 38                             if (rowCount > 0)
 39                             {
 40                                 IRow firstRow = sheet.GetRow(0);//第一行
 41                                 int cellCount = firstRow.LastCellNum;//列數
 42 
 43                                 //構建datatable的列
 44                                 if (isColumnName)
 45                                 {
 46                                     startRow = 1;//如果第一行是列名，則從第二行開始讀取
 47                                     for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
 48                                     {
 49                                         cell = firstRow.GetCell(i);
 50                                         if (cell != null)
 51                                         {
 52                                             if (cell.StringCellValue != null)
 53                                             {
 54                                                 column = new DataColumn(cell.StringCellValue);
 55                                                 dataTable.Columns.Add(column);
 56                                             }
 57                                         }
 58                                     }
 59                                 }
 60                                 else
 61                                 {
 62                                     for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
 63                                     {
 64                                         column = new DataColumn("column" + (i + 1));
 65                                         dataTable.Columns.Add(column);
 66                                     }
 67                                 }
 68 
 69                                 //填充行
 70                                 for (int i = startRow; i <= rowCount; ++i)
 71                                 {
 72                                     row = sheet.GetRow(i);
 73                                     if (row == null) continue;
 74 
 75                                     dataRow = dataTable.NewRow();
 76                                     for (int j = row.FirstCellNum; j < cellCount; ++j)
 77                                     {
 78                                         cell = row.GetCell(j);
 79                                         if (cell == null)
 80                                         {
 81                                             dataRow[j] = "";
 82                                         }
 83                                         else
 84                                         {
 85                                             //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
 86                                             switch (cell.CellType)
 87                                             {
 88                                                 case CellType.Blank:
 89                                                     dataRow[j] = "";
 90                                                     break;
 91                                                 case CellType.Numeric:
 92                                                     short format = cell.CellStyle.DataFormat;
 93                                                     //對時間格式（2015.12.5、2015/12/5、2015-12-5等）的處理
 94                                                     if (format == 14 || format == 31 || format == 57 || format == 58)
 95                                                         dataRow[j] = cell.DateCellValue;
 96                                                     else
 97                                                         dataRow[j] = cell.NumericCellValue;
 98                                                     break;
 99                                                 case CellType.String:
100                                                     dataRow[j] = cell.StringCellValue;
101                                                     break;
102                                             }
103                                         }
104                                     }
105                                     dataTable.Rows.Add(dataRow);
106                                 }
107                             }
108                         }
109                     }
110                 }
111                 return dataTable;
112             }
113             catch (Exception)
114             {
115                 if (fs != null)
116                 {
117                     fs.Close();
118                 }
119                 return null;
120             }
121         }
122 
123         /// <summary>
124         /// 寫入excel
125         /// </summary>
126         /// <param name="dt">datatable</param>
127         /// <param name="strFile">strFile</param>
128         /// <returns></returns>
129         public static bool DataTableToExcel(DataTable dt, string strFile)
130         {
131             bool result = false;
132             IWorkbook workbook = null;
133             FileStream fs = null;
134             IRow row = null;
135             ISheet sheet = null;
136             ICell cell = null;
137             try
138             {
139                 if (dt != null && dt.Rows.Count > 0)
140                 {
141                     workbook = new HSSFWorkbook();
142                     sheet = workbook.CreateSheet("Sheet0");//創建一個名稱為Sheet0的表
143                     int rowCount = dt.Rows.Count;//行數
144                     int columnCount = dt.Columns.Count;//列數
145 
146                     //設置列頭
147                     row = sheet.CreateRow(0);//excel第一行設為列頭
148                     for (int c = 0; c < columnCount; c++)
149                     {
150                         cell = row.CreateCell(c);
151                         cell.SetCellValue(dt.Columns[c].ColumnName);
152                     }
153 
154                     //設置每行每列的單元格,
155                     for (int i = 0; i < rowCount; i++)
156                     {
157                         row = sheet.CreateRow(i + 1);
158                         for (int j = 0; j < columnCount; j++)
159                         {
160                             cell = row.CreateCell(j);//excel第二行開始寫入數據
161                             cell.SetCellValue(dt.Rows[i][j].ToString());
162                         }
163                     }
164                     using (fs = File.OpenWrite(strFile))
165                     {
166                         workbook.Write(fs);//向打開的這個xls文件中寫入數據
167                         result = true;
168                     }
169                 }
170                 return result;
171             }
172             catch (Exception ex)
173             {
174                 if (fs != null)
175                 {
176                     fs.Close();
177                 }
178                 return false;
179             }
180         }
181 
182         /// <summary>
183         /// Excel導入成Datable
184         /// </summary>
185         /// <param name="file">導入路徑(包含文件名與擴展名)</param>
186         /// <returns></returns>
187         public static DataTable ExcelToTable(string file)
188         {
189             DataTable dt = new DataTable();
190             IWorkbook workbook;
191             string fileExt = Path.GetExtension(file).ToLower();
192             using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
193             {
194                 //XSSFWorkbook 適用XLSX格式，HSSFWorkbook 適用XLS格式
195                 if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(fs); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(fs); } else { workbook = null; }
196                 if (workbook == null) { return null; }
197                 ISheet sheet = workbook.GetSheetAt(0);
198 
199                 //表頭  
200                 IRow header = sheet.GetRow(sheet.FirstRowNum);
201                 List<int> columns = new List<int>();
202                 for (int i = 0; i < header.LastCellNum; i++)
203                 {
204                     object obj = GetValueType(header.GetCell(i));
205                     if (obj == null || obj.ToString() == string.Empty)
206                     {
207                         dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
208                     }
209                     else
210                         dt.Columns.Add(new DataColumn(obj.ToString()));
211                     columns.Add(i);
212                 }
213                 //數據  
214                 for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
215                 {
216                     DataRow dr = dt.NewRow();
217                     bool hasValue = false;
218                     foreach (int j in columns)
219                     {
220                         dr[j] = GetValueType(sheet.GetRow(i).GetCell(j));
221                         if (dr[j] != null && dr[j].ToString() != string.Empty)
222                         {
223                             hasValue = true;
224                         }
225                     }
226                     if (hasValue)
227                     {
228                         dt.Rows.Add(dr);
229                     }
230                 }
231             }
232             return dt;
233         }
234 
235         /// <summary>
236         /// Datable導出成Excel
237         /// </summary>
238         /// <param name="dt"></param>
239         /// <param name="file">導出路徑(包括文件名與擴展名)</param>
240         public static void TableToExcel(DataTable dt, string file)
241         {
242             IWorkbook workbook;
243             string fileExt = Path.GetExtension(file).ToLower();
244             if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(); } else { workbook = null; }
245             if (workbook == null) { return; }
246             ISheet sheet = string.IsNullOrEmpty(dt.TableName) ? workbook.CreateSheet("Sheet1") : workbook.CreateSheet(dt.TableName);
247 
248             //表頭  
249             IRow row = sheet.CreateRow(0);
250             for (int i = 0; i < dt.Columns.Count; i++)
251             {
252                 ICell cell = row.CreateCell(i);
253                 cell.SetCellValue(dt.Columns[i].ColumnName);
254             }
255 
256             //數據  
257             for (int i = 0; i < dt.Rows.Count; i++)
258             {
259                 IRow row1 = sheet.CreateRow(i + 1);
260                 for (int j = 0; j < dt.Columns.Count; j++)
261                 {
262                     ICell cell = row1.CreateCell(j);
263                     cell.SetCellValue(dt.Rows[i][j].ToString());
264                 }
265             }
266 
267             //轉為字節數組  
268             MemoryStream stream = new MemoryStream();
269             workbook.Write(stream);
270             var buf = stream.ToArray();
271 
272             //保存為Excel文件  
273             using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
274             {
275                 fs.Write(buf, 0, buf.Length);
276                 fs.Flush();
277             }
278         }
279 
280         /// <summary>
281         /// 獲取單元格類型
282         /// </summary>
283         /// <param name="cell"></param>
284         /// <returns></returns>
285         private static object GetValueType(ICell cell)
286         {
287             if (cell == null)
288                 return null;
289             switch (cell.CellType)
290             {
291                 case CellType.Blank: //BLANK:  
292                     return null;
293                 case CellType.Boolean: //BOOLEAN:  
294                     return cell.BooleanCellValue;
295                 case CellType.Numeric: //NUMERIC:  
296                     return cell.NumericCellValue;
297                 case CellType.String: //STRING:  
298                     return cell.StringCellValue;
299                 case CellType.Error: //ERROR:  
300                     return cell.ErrorCellValue;
301                 case CellType.Formula: //FORMULA:  
302                 default:
303                     return "=" + cell.CellFormula;
304 
305             }
306         }
307 
308     }
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