1 public static DataTable ExcelToDataTable(string filePath)
2 {
3 DataTable dt = new DataTable();
4
5 HSSFWorkbook hssfworkbook;
6 using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
7 {
8 hssfworkbook = new HSSFWorkbook(file);
9 }
10 ISheet sheet = hssfworkbook.GetSheetAt(0);
11 System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
12
13 IRow headerRow = sheet.GetRow(0);
14 int cellCount = headerRow.LastCellNum;
15
16 for (int j = 0; j < cellCount; j++)
17 {
18 ICell cell = headerRow.GetCell(j);
19 dt.Columns.Add(cell.ToString());
20 }
21
22 for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
23 {
24 IRow row = sheet.GetRow(i);
25 DataRow dataRow = dt.NewRow();
26 if (row == null)
27 {
28 break;
29 }
30 for (int j = row.FirstCellNum; j < cellCount; j++)
31 {
32 if (row.GetCell(j) != null)
33 dataRow[j] = row.GetCell(j).ToString();
34 }
35
36 dt.Rows.Add(dataRow);
37 }
38 return dt;
39 }
导出到excel
1 public static MemoryStream DataToExcel(DataTable dt)
2 {
3 MemoryStream ms = new MemoryStream();
4 using (dt)
5 {
6 IWorkbook workbook = new HSSFWorkbook();//创建excel工作簿
7 ISheet sheet = workbook.CreateSheet();//在该表中创建工作表
8 IRow headerRow = sheet.CreateRow(0); //在表中添加一行
9 foreach (DataColumn column in dt.Columns)
10 headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);
11 int rowIndex = 1;
12 foreach (DataRow row in dt.Rows)
13 {
14 IRow dataRow = sheet.CreateRow(rowIndex);
15 foreach (DataColumn column in dt.Columns)
16 {
17 dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
18 }
19 rowIndex++;
20 }
21 workbook.Write(ms);
22 ms.Flush();
23 ms.Position = 0;
24 }
25 return ms;
26 }
接着
1 MemoryStream ms = ExcelHelper.DataToExcel(dt);
2 FileStream fs = new FileStream("e:\\2.xls", FileMode.Create);
3 ms.WriteTo(fs);
4 fs.Close();
5 ms.Close();
时间： 2024-10-04 12:32:01