NPOI操作

1.操作Excel

　　准备生成的公共方法(将数据源DataTable转换成MemoryStream)

 

 1         /// <summary>
 2         /// 生成Excel
 3         /// </summary>
 4         /// <param name="table">DataTable</param>
 5         /// <returns>MemoryStream</returns>
 6         public static MemoryStream BuildToExcel(DataTable table)
 7         {
 8             MemoryStream ms = new MemoryStream();
 9 
10             using (table)
11             {
12                 using (IWorkbook workbook = new HSSFWorkbook())
13                 {
14                     using (ISheet sheet = workbook.CreateSheet())
15                     {
16                         IRow headerRow = sheet.CreateRow(0);
17 
18                         // handling header.
19                         foreach (DataColumn column in table.Columns)
20                         {
21                             headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);
22                         }
23 
24                         // handling value.
25                         int rowIndex = 1;
26 
27                         foreach (DataRow row in table.Rows)
28                         {
29                             IRow dataRow = sheet.CreateRow(rowIndex);
30 
31                             foreach (DataColumn column in table.Columns)
32                             {
33                                 dataRow.CreateCell(column.Ordinal, CellType.STRING).SetCellValue(row[column].ToString());
34                             }
35 
36                             rowIndex++;
37                         }
38 
39                         AutoSizeColumns(sheet);
40                         workbook.Write(ms);
41                         ms.Flush();
42                         ms.Position = 0;
43                     }
44                 }
45             }
46 
47             return ms;
48         }

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