【记录】解析具有合并单元格的Excel

 1  /// <summary>
 2         /// 复制电子表格，达到拆分单元格的目的
 3         /// </summary>
 4         /// <returns></returns>
 5         public IWorkbook AnalyseExcel(IWorkbook book)
 6         {
 7             /*用于存复制之后的电子表格*/
 8             IWorkbook result = null;
 9             /*判断传入的格式，返回同类的格式*/
10             if (book == null)
11             {
12                 return null;
13             }
14             else if (book is HSSFWorkbook)
15             {
16                 result = new HSSFWorkbook();//.xls
17             }
18             else if (book is XSSFWorkbook)
19             {
20                 result = new XSSFWorkbook();//.xlsx
21             }
22             else//其他文件类型，不支持
23             {
24                 return null;
25             }
26             for (int index = 0; index < book.NumberOfSheets;index++ )//遍历所有sheet
27             {
28                 ISheet sheet = book.GetSheetAt(index);
29                 ISheet sheet1 = result.CreateSheet(sheet.SheetName);
30                 int rows = sheet.PhysicalNumberOfRows;
31                 /*先复制所有数据*/
32                 for (int j = 0; j < rows; j++)
33                 {
34                     IRow row = sheet.GetRow(j);
35                     IRow row1 = sheet1.CreateRow(j);
36                     List<ICell> cells = row.Cells;
37                     for (int k = 0; k < cells.Count; k++)
38                     {
39                         row1.CreateCell(k).SetCellValue(cells[k].ToString());
40                     }
41                 }
42 
43                 /*拆分已合并单元格，并给余下单元格赋值*/
44                 for (int j = 0; j < sheet.NumMergedRegions; j++)
45                 {
46                     var cellRange = sheet.GetMergedRegion(j);//获取第i个合并单元格
47                     int rowStart = cellRange.FirstRow;//获取该合并单元格起始行
48                     int colStart = cellRange.FirstColumn;//获取该合并单元格起始列
49                     int rowEnd = cellRange.LastRow;//获取该合并单元格终止行
50                     int colEnd = cellRange.LastColumn;//获取该合并单元格终止列
51                     string data = sheet.GetRow(rowStart).GetCell(colStart).ToString();//获取该合并单元格值
52                     for (int m = rowStart; m <= rowEnd; m++)//遍历该合并单元格所包含的所有单元格
53                     {
54                         IRow row = null;
55                         for (int n = colStart; n <= colEnd; n++)
56                         {
57                             try
58                             {
59                                 sheet1.GetRow(m).GetCell(n).SetCellValue(data);//中间部分可能存在空行，如果是空行则捕获异常，创建该行即可
60                             }
61                             catch (Exception e)
62                             {
63                                 if (row == null)
64                                 {
65                                     row = sheet1.CreateRow(m);
66                                 }
67                                 sheet1.GetRow(m).GetCell(n).SetCellValue(data);//创建行并设单元格的值
68                             }
69 
70                         }
71                     }
72                 }
73             }
74             return result;
75         }