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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      MVC导出

 1         /// <summary>

 2         /// 下载excel文件

 3         /// </summary>

 4         /// <param name="fileName">文件名称</param>

 5         /// <param name="dataTable">数据源</param>

 6         /// <returns>FileResult</returns>

 7         private FileResult DownloadExcel(string fileName, DataTable dataTable)

 8         {

 9             MemoryStream stream = WalletComm.BuildToExcel(dataTable);

10             stream.Seek(0, SeekOrigin.Begin);

11             return File(stream, "application/vnd.ms-excel", fileName);

12         }

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2.操作CSV

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

 1         /// <summary>

 2         /// 生成CSV

 3         /// </summary>

 4         /// <param name="table">DataTable</param>

 5         /// <returns>MemoryStream</returns>

 6         public static MemoryStream BuildToCsv(DataTable table)

 7         {

 8             Encoding encode = Encoding.GetEncoding("gb2312");

 9             StringBuilder str = new StringBuilder();

10             if (table != null && table.Columns.Count > 0 && table.Rows.Count > 0)

11             {

12                 for (int i = 0; i < table.Columns.Count; i++)

13                 {

14                     str.Append(table.Columns[i].ColumnName.Replace("\"", "\"\""));

15                     if (i < table.Columns.Count - 1)

16                     {

17                         str.Append(",");

18                     }

19                 }

20 

21                 foreach (DataRow item in table.Rows)

22                 {

23                     str.Append("\r\n");

24                     for (int i = 0; i < table.Columns.Count; i++)

25                     {

26                         if (item[i] != null)

27                         {

28                             str.Append("'").Append(item[i].ToString().Replace("\"", "\"\""));

29                         }

30 

31                         if (i < table.Columns.Count - 1)

32                         {

33                             str.Append(",");

34                         }

35                     }

36                 }

37             }

38 

39             MemoryStream stream = new MemoryStream(encode.GetBytes(str.ToString()));

40             return stream;

41         }

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　　MVC导出

 1         /// <summary>

 2         /// 下载csv文件

 3         /// </summary>

 4         /// <param name="fileName">文件名称</param>

 5         /// <param name="dataTable">数据源</param>

 6         /// <returns>FileResult</returns>

 7         private FileResult DownloadCsv(string fileName, DataTable dataTable)

 8         {

 9             MemoryStream stream = WalletComm.BuildToCsv(dataTable);

10             stream.Seek(0, SeekOrigin.Begin);

11             return File(stream, "text/comma-separated-values", fileName);

12         }

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