NPOI Excel导入 导出

添加引用

using NPOI.HSSF.UserModel;

using NPOI.SS.UserModel;

using System;

using System.Collections.Generic;

using System.Data;

using System.IO;

using System.Text;

导入

 1  public DataSet ExcelToDataTable(string path)

 2         {

 3             DataSet dataSet1 = new DataSet();

 4             HSSFWorkbook hssfworkbook;

 5             using (FileStream file = new FileStream(path, FileMode.Open, FileAccess.Read))

 6             {

 7                 hssfworkbook = new HSSFWorkbook(file); //把xls文件中的数据写入hssfworkbook中

 8 

 9 

10                 //for (int i = 0; i < hssfworkbook.NumberOfSheets; i++)  //NumberOfSheets是myxls.xls中总共的表数

11                 //{

12                 ISheet sheet = hssfworkbook.GetSheetAt(0);   //读取当前表数据

13 

14                 DataTable dt = new DataTable();

15 

16                 for (int j = 0; j <= sheet.LastRowNum; j++)  //LastRowNum 是当前表的总行数

17                 {

18                     IRow row = sheet.GetRow(j);  //读取当前行数据

19                     DataRow dr = dt.NewRow();

20                     if (row != null)

21                     {

22                         //sbr.Append("-------------------------------------\r\n"); //读取行与行之间的提示界限

23                         for (int k = 0; k < row.LastCellNum; k++)  //LastCellNum 是当前行的总列数

24                         {

25                             ICell cell = row.GetCell(k);  //当前表格

26                             if (cell != null)

27                             {

28                                 if (j == 0)

29                                 {

30                                     dt.Columns.Add(cell.ToString());

31                                 }

32                                 else

33                                 {

34                                     RegexHelper regexHelper = new RegexHelper();

35 

36                                     if (regexHelper.IsMatch(cell.ToString(), "[0-9]{1,2}/[0-9]{1,2}/[0-9]{2,4}"))

37                                     {

38                                         dr[k] = cell.DateCellValue.ToString();

39                                     }

40                                     else

41                                     {

42                                         dr[k] = cell.ToString();

43                                     }

44                                     //日期格式判断输出

45 

46                                 }

47                                 //sbr.Append(cell.ToString());   //获取表格中的数据并转换为字符串类型

48 

49                             }

50                         }//for

51                     }// if (row != null)

52                     if (j != 0)

53                     {

54                         dt.Rows.Add(dr);

55                     }

56                 }//for j

57 

58                 dataSet1.Tables.Add(dt);

59 

60                 //}

61 

62             }//using

63             return dataSet1;

64         }

导出

 1 #region "数据导出"

 2         /// <summary>

 3         /// WinForm DataTable数据导出Excel到本地

 4         /// </summary>

 5         /// <param name="table"></param>

 6         /// <param name="fileName"></param>

 7         public static void SaveToFile(DataTable table, string fileName)

 8         {

 9             using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))

10             {

11                 MemoryStream ms = RenderToExcel(table);

12 

13                 byte[] data = ms.ToArray();

14 

15                 fs.Write(data, 0, data.Length);

16                 fs.Flush();

17 

18                 data = null;

19             }

20         }

21         public static MemoryStream RenderToExcel(DataTable table)

22         {

23             MemoryStream ms = new MemoryStream();

24 

25             using (table)

26             {

27                 using (IWorkbook workbook = new HSSFWorkbook())

28                 {

29                     using (ISheet sheet = workbook.CreateSheet())

30                     {

31                         IRow headerRow = sheet.CreateRow(0);

32 

33                         // 处理标题.

34                         foreach (DataColumn column in table.Columns)

35                             headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//如果标题没有设置,返回ColumnName的值

36 

37 

38                         int rowIndex = 1;

39 

40                         foreach (DataRow row in table.Rows)

41                         {

42                             IRow dataRow = sheet.CreateRow(rowIndex);

43 

44                             foreach (DataColumn column in table.Columns)

45                             {

46                                 dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());

47                             }

48 

49                             rowIndex++;

50                         }

51 

52                         workbook.Write(ms);

53                         ms.Flush();

54                         ms.Position = 0;

55                     }

56                 }

57             }

58             return ms;

59         }

60 

61         /// <summary>

62         /// Web DataTable 数据导出到浏览器客户端

63         /// </summary>

64         /// <param name="table"></param>

65         /// <param name="context"></param>

66         /// <param name="fileName"></param>

67         static void RenderToBrowser(DataTable table, HttpContext context, string fileName)

68         {

69             MemoryStream ms = RenderToExcel(table);

70             if (context.Request.Browser.Browser == "IE")

71                 fileName = HttpUtility.UrlEncode(fileName);

72             context.Response.AddHeader("Content-Disposition", "attachment;fileName=" + fileName);

73             context.Response.BinaryWrite(ms.ToArray());

74         }

75 

76         #endregion

调用  ExcelHelp类就是上面写的自定义类

 1  ExcelHelp ExcelHelp = new ExcelHelp();

 2             //导入Excel到datagridview

 3             dataGridView1.DataSource = ExcelHelp.ExcelToDataTable(txtfileurl.Text).Tables[0];

 4             //导出

 5             saveFileDialog1.Filter = "Excel|*.Xls;";

 6             saveFileDialog1.FileName = "测试.Xls";

 7             if (saveFileDialog1.ShowDialog() == DialogResult.OK)

 8             {

 9                 ExcelHelp.SaveToFile(rptDst.Tables["interaction"], saveFileDialog1.FileName);

10             }