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NPOI读写Excel0307

  1 #region NPOI 操作 Excel 2007
  2         /// <summary>  
  3         /// 将Excel文件中的数据读出到DataTable中(xlsx)  
  4         /// </summary>  
  5         /// <param name="file"></param>  
  6         /// <returns></returns>  
  7         public static DataTable ExcelToTableForXLSX(string filePath)
  8         {
  9             DataTable dt = new DataTable();
 10             using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
 11             {
 12                 XSSFWorkbook xssfworkbook = new XSSFWorkbook(fs);
 13                 ISheet sheet = xssfworkbook.GetSheetAt(0);
 14 
 15                 //表头  
 16                 IRow header = sheet.GetRow(sheet.FirstRowNum);
 17                 List<int> columns = new List<int>();
 18                 for (int i = 0; i < header.LastCellNum; i++)
 19                 {
 20                     object obj = GetValueTypeForXLSX(header.GetCell(i) as XSSFCell);
 21                     if (obj == null || obj.ToString() == string.Empty)
 22                     {
 23                         dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
 24                         //continue;  
 25                     }
 26                     else
 27                         dt.Columns.Add(new DataColumn(obj.ToString()));
 28                     columns.Add(i);
 29                 }
 30                 //数据  
 31                 for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
 32                 {
 33                     DataRow dr = dt.NewRow();
 34                     bool hasValue = false;
 35                     foreach (int j in columns)
 36                     {
 37                         dr[j] = GetValueTypeForXLSX(sheet.GetRow(i).GetCell(j) as XSSFCell);
 38                         if (dr[j] != null && dr[j].ToString() != string.Empty)
 39                         {
 40                             hasValue = true;
 41                         }
 42                     }
 43                     if (hasValue)
 44                     {
 45                         dt.Rows.Add(dr);
 46                     }
 47                 }
 48             }
 49             return dt;
 50         }
 51 
 52         /// <summary>  
 53         /// 将DataTable数据导出到Excel文件中(xlsx)  
 54         /// </summary>  
 55         /// <param name="dt"></param>  
 56         /// <param name="file"></param>  
 57         public static void TableToExcelForXLSX(DataTable dt, string file)
 58         {
 59             XSSFWorkbook xssfworkbook = new XSSFWorkbook();
 60             ISheet sheet = xssfworkbook.CreateSheet("Test");
 61 
 62             //表头  
 63             IRow row = sheet.CreateRow(0);
 64             for (int i = 0; i < dt.Columns.Count; i++)
 65             {
 66                 ICell cell = row.CreateCell(i);
 67                 cell.SetCellValue(dt.Columns[i].ColumnName);
 68             }
 69 
 70             //数据  
 71             for (int i = 0; i < dt.Rows.Count; i++)
 72             {
 73                 IRow row1 = sheet.CreateRow(i + 1);
 74                 for (int j = 0; j < dt.Columns.Count; j++)
 75                 {
 76                     ICell cell = row1.CreateCell(j);
 77                     cell.SetCellValue(dt.Rows[i][j].ToString());
 78                 }
 79             }
 80 
 81             //转为字节数组  
 82             MemoryStream stream = new MemoryStream();
 83             xssfworkbook.Write(stream);
 84             var buf = stream.ToArray();
 85 
 86             //保存为Excel文件  
 87             using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
 88             {
 89                 fs.Write(buf, 0, buf.Length);
 90                 fs.Flush();
 91             }
 92         }
 93 
 94         /// <summary>  
 95         /// 获取单元格类型(xlsx)  
 96         /// </summary>  
 97         /// <param name="cell"></param>  
 98         /// <returns></returns>  
 99         private static object GetValueTypeForXLSX(XSSFCell cell)
100         {
101             if (cell == null)
102                 return null;
103             switch (cell.CellType)
104             {
105                 case CellType.Blank: //BLANK:  
106                     return null;
107                 case CellType.Boolean: //BOOLEAN:  
108                     return cell.BooleanCellValue;
109                 case CellType.Numeric: //NUMERIC:  
110                     return cell.NumericCellValue;
111                 case CellType.String: //STRING:  
112                     return cell.StringCellValue;
113                 case CellType.Error: //ERROR:  
114                     return cell.ErrorCellValue;
115                 case CellType.Formula: //FORMULA:  
116                 default:
117                     return "=" + cell.CellFormula;
118             }
119         }   
120         #endregion
121 
122         #region NPOI 操作 Excel 2003
123         /// <summary>  
124         /// 将Excel文件中的数据读出到DataTable中(xls)  
125         /// </summary>  
126         /// <param name="file"></param>  
127         /// <returns></returns>  
128         /// 
129         public static DataTable ExcelToTableForXLS(string filePath)
130         {
131             DataTable dt = new DataTable();
132             using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
133             {
134                 HSSFWorkbook hssfworkbook = new HSSFWorkbook(fs);
135                 ISheet sheet = hssfworkbook.GetSheetAt(0);
136 
137                 //表头  
138                 IRow header = sheet.GetRow(sheet.FirstRowNum);
139                 List<int> columns = new List<int>();
140                 for (int i = 0; i < header.LastCellNum; i++)
141                 {
142                     object obj = GetValueTypeForXLS(header.GetCell(i) as HSSFCell);
143                     if (obj == null || obj.ToString() == string.Empty)
144                     {
145                         dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
146                         //continue;  
147                     }
148                     else
149                         dt.Columns.Add(new DataColumn(obj.ToString()));
150                     columns.Add(i);
151                 }
152                 //数据  
153                 for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
154                 {
155                     DataRow dr = dt.NewRow();
156                     bool hasValue = false;
157                     foreach (int j in columns)
158                     {
159                         dr[j] = GetValueTypeForXLS(sheet.GetRow(i).GetCell(j) as HSSFCell);
160                         if (dr[j] != null && dr[j].ToString() != string.Empty)
161                         {
162                             hasValue = true;
163                         }
164                     }
165                     if (hasValue)
166                     {
167                         dt.Rows.Add(dr);
168                     }
169                 }
170             }
171             return dt;
172         }
173 
174         /// <summary>  
175         /// 将DataTable数据导出到Excel文件中(xls)  
176         /// </summary>  
177         /// <param name="dt"></param>  
178         /// <param name="file"></param>  
179         public static void TableToExcelForXLS(DataTable dt, string file)
180         {
181             HSSFWorkbook hssfworkbook = new HSSFWorkbook();
182             ISheet sheet = hssfworkbook.CreateSheet("Test");
183 
184             //表头  
185             IRow row = sheet.CreateRow(0);
186             for (int i = 0; i < dt.Columns.Count; i++)
187             {
188                 ICell cell = row.CreateCell(i);
189                 cell.SetCellValue(dt.Columns[i].ColumnName);
190             }
191 
192             //数据  
193             for (int i = 0; i < dt.Rows.Count; i++)
194             {
195                 IRow row1 = sheet.CreateRow(i + 1);
196                 for (int j = 0; j < dt.Columns.Count; j++)
197                 {
198                     ICell cell = row1.CreateCell(j);
199                     cell.SetCellValue(dt.Rows[i][j].ToString());
200                 }
201             }
202 
203             //转为字节数组  
204             MemoryStream stream = new MemoryStream();
205             hssfworkbook.Write(stream);
206             var buf = stream.ToArray();
207 
208             //保存为Excel文件  
209             using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
210             {
211                 fs.Write(buf, 0, buf.Length);
212                 fs.Flush();
213             }
214         }
215 
216         /// <summary>  
217         /// 获取单元格类型(xls)  
218         /// </summary>  
219         /// <param name="cell"></param>  
220         /// <returns></returns>  
221         private static object GetValueTypeForXLS(HSSFCell cell)
222         {
223             if (cell == null)
224                 return null;
225             switch (cell.CellType)
226             {
227                 case CellType.Blank: //BLANK:  
228                     return null;
229                 case CellType.Boolean: //BOOLEAN:  
230                     return cell.BooleanCellValue;
231                 case CellType.Numeric: //NUMERIC:  
232                     return cell.NumericCellValue;
233                 case CellType.String: //STRING:  
234                     return cell.StringCellValue;
235                 case CellType.Error: //ERROR:  
236                     return cell.ErrorCellValue;
237                 case CellType.Formula: //FORMULA:  
238                 default:
239                     return "=" + cell.CellFormula;
240             }
241         } 
242         #endregion

通过字符串Split就可以得到后缀

1 private string MySubString(string s)
2         {
3             string[] str = s.Split('.');
4             string temp = str[1];
5             return temp;
6         }

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原文地址：https://www.cnblogs.com/T-J-D/p/3906567.html